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Comparative analysis of thermodynamic and mechanical responses between underground hydrogen storage and compressed air energy storage in lined rock caverns
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作者 Bowen Hu Liyuan Yu +5 位作者 Xianzhen Mi Fei Xu Shuchen Li Wei Li Chao Wei Tao Zhang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第4期531-543,共13页
Underground hydrogen storage(UHS)and compressed air energy storage(CAES)are two viable largescale energy storage technologies for mitigating the intermittency of wind and solar power.Therefore,it is meaningful to comp... Underground hydrogen storage(UHS)and compressed air energy storage(CAES)are two viable largescale energy storage technologies for mitigating the intermittency of wind and solar power.Therefore,it is meaningful to compare the properties of hydrogen and air with typical thermodynamic storage processes.This study employs a multi-physical coupling model to compare the operations of CAES and UHS,integrating gas thermodynamics within caverns,thermal conduction,and mechanical deformation around rock caverns.Gas thermodynamic responses are validated using additional simulations and the field test data.Temperature and pressure variations of air and hydrogen within rock caverns exhibit similarities under both adiabatic and diabatic simulation modes.Hydrogen reaches higher temperature and pressure following gas charging stage compared to air,and the ideal gas assumption may lead to overestimation of gas temperature and pressure.Unlike steel lining of CAES,the sealing layer(fibre-reinforced plastic FRP)in UHS is prone to deformation but can effectively mitigates stress in the sealing layer.In CAES,the first principal stress on the surface of the sealing layer and concrete lining is tensile stress,whereas UHS exhibits compressive stress in the same areas.Our present research can provide references for the selection of energy storage methods. 展开更多
关键词 Underground hydrogen storage Compressed air energy storage mechanical response Thermodynamic response Lined rock caverns
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Investigations of the mechanical response of dummy HTPB propellant grain under ultrahigh acceleration overload conditions using onboard flight-test measurements
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作者 Yiming Zhang Ningfei Wang +3 位作者 Weihua Ma Ran Wang Long Bai Yi Wu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第2期473-484,共12页
In this paper,to study the mechanical responses of a solid propellant subjected to ultrahigh acceleration overload during the gun-launch process,specifically designed projectile flight tests with an onboard measuremen... In this paper,to study the mechanical responses of a solid propellant subjected to ultrahigh acceleration overload during the gun-launch process,specifically designed projectile flight tests with an onboard measurement system were performed.Two projectiles containing dummy HTPB propellant grains were successfully recovered after the flight tests with an ultrahigh acceleration overload value of 8100 g.The onboard-measured time-resolved axial displacement,contact stress and overload values were successfully obtained and analysed.Uniaxial compression tests of the dummy HTPB propellant used in the gunlaunched tests were carried out at low and intermediate strain rates to characterize the propellant's dynamic properties.A linear viscoelastic constitutive model was employed and applied in finite-element simulations of the projectile-launching process.During the launch process,the dummy propellant grain exhibited large deformation due to the high acceleration overload,possibly leading to friction between the motor case and propellant grain.The calculated contact stress showed good agreement with the experimental results,though discrepancies in the overall displacement of the dummy propellant grain were observed.The dynamic mechanical response process of the dummy propellant grain was analysed in detail.The results can be used to estimate the structural integrity of the analysed dummy propellant grain during the gun-launch process. 展开更多
关键词 Gun-launched flight test Dummy HTPB propellant Onboard measurements Utrahigh overload mechanical response
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Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt
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作者 Luo Qiqi Yu Qian +3 位作者 Zhang Sheng Ma Xinyan Ye Xinyu Du Yinfei 《Journal of Southeast University(English Edition)》 EI CAS 2024年第3期266-274,共9页
Through a self-developed model test system,the mechanical properties of silt and the deformation characteristics of airport runways were investigated during the period of subgrade wetting.Based on the test results,the... Through a self-developed model test system,the mechanical properties of silt and the deformation characteristics of airport runways were investigated during the period of subgrade wetting.Based on the test results,the reliability of the numerical simulation results was verified.Numerical models with different sizes were established.Under the same cushion parameter and loading width ranges,the effects of the cushion parameters and loading conditions on the mechanical responses of the cushion before and after subgrade wetting were analyzed.The results show that the internal friction angles of silt with different wetting degrees are approximately 34°.The cohesion is from 8 to 44 kPa,and the elastic modulus is from 15 to 34 MPa.Before and after subgrade wetting,the variation rates of the cushion horizontal tensile stresses with the same cushion parameters and loading width ranges are different under the influence of boundary effects.After subgrade wetting,the difference in the variation rates of the cushion horizontal tensile stresses under the same cushion parameter range decreases compared with that before subgrade wetting;however,this difference increases under the same loading width range.Before and after subgrade wetting,the influence of the boundary effect on the mechanical response evaluation of the cushion is not beneficial for optimizing the pavement design parameters.When the cushion thickness is more than 0.25 m,the influence of the boundary effect can be disregarded. 展开更多
关键词 pavement cushion silt subgrade WETTING boundary effect mechanical response
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Mechanical response of bridge piles in high-steep slopes and sensitivity study 被引量:11
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作者 赵衡 尹平保 李夕兵 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期4043-4048,共6页
The bridge piles located in high-steep slopes not only endure the loads from superstructure, but also the residual sliding force as well as the resistance from the slope. By introducing the Winkler foundation theory, ... The bridge piles located in high-steep slopes not only endure the loads from superstructure, but also the residual sliding force as well as the resistance from the slope. By introducing the Winkler foundation theory, the mechanical model of piles-soils-slopes system was established, and the equilibrium differential equations of pile were derived. Moreover, an analytic solution for identifying the model parameters was provided by means of power series method. A project with field measurement was compared with the proposed method. It is indicated that the lateral loads have great influences on the pile, the steep slope effect is indispensable, and reasonable diameter of the pile could enhance the bending ability. The internal force and displacements of pile are largely based upon the horizontal loads applied on pile, especially in upper part. 展开更多
关键词 BRIDGE mechanical response high-steep slope inclined load power series method
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Unveiling the mechanical response and accommodation mechanism of pre-rolled AZ31 magnesium alloy under high-speed impact loading 被引量:7
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作者 Xiao Liu Hui Yang +3 位作者 Biwu Zhu Yuanzhi Wu Wenhui Liu Changping Tang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第4期1096-1108,共13页
Split Hopkinson pressure bar(SHPB)tests were conducted on pre-rolled AZ31 magnesium alloy at 150–350℃ with strain rates of 2150s-1,3430s^(-1) and 4160s-1.The mechanical response,microstructural evolution and accommo... Split Hopkinson pressure bar(SHPB)tests were conducted on pre-rolled AZ31 magnesium alloy at 150–350℃ with strain rates of 2150s-1,3430s^(-1) and 4160s-1.The mechanical response,microstructural evolution and accommodation mechanism of the pre-rolled AZ31 magnesium alloy under high-speed impact loading were investigated.The twin and shear band are prevailing at low temperature,and the coexistence of twins and recrystallized grains is the dominant microstructure at medium temperature,while at high temperature,dynamic recrystallization(DRX)is almost complete.The increment of temperature reduces the critical condition difference between twinning and DRX,and the recrystallized temperature decreases with increasing strain rate.The mechanical response is related to the competition among the shear band strengthen,the twin strengthen and the fine grain strengthen and determined by the prevailing grain structure.The fine grain strengthen could compensate soften caused by the temperature increase and the reduction of twin and shear band.During high-speed deformation,different twin variants,introduced by pre-rolling,induce different deformation mechanism to accommodate plastic deformation and are in favor for non-basal slip.At low temperature,the high-speed deformation is achieved by twinning,dislocation slip and the following deformation shear band at different deformation stages.At high temperature,the high-speed deformation is realized by twinning and dislocation slip of early deformation stage,transition shear band of medium deformation stage and DRX of final deformation stage. 展开更多
关键词 mechanical response Pre-twinning Accommodation mechanism Pre-rolled AZ31 magnesium alloy High-speed impact loading
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Mechanical response of transmission lines based on sliding cable element 被引量:4
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作者 刘云 钱振东 夏开全 《Journal of Central South University》 SCIE EI CAS 2014年第8期3370-3377,共8页
In order to study the sliding characteristics when the cable is connected with the other rods in the transmission line structures,a linear sliding cable element based on updated Lagrangian formulation and a sliding ca... In order to study the sliding characteristics when the cable is connected with the other rods in the transmission line structures,a linear sliding cable element based on updated Lagrangian formulation and a sliding catenary element considering the out-of-plane stiffness coefficient are put forward.A two-span and a three-span cable structures are taken as examples to verify the sliding cable elements.By comparing the tensions of the two proposed cable elements with the existing research results,the error is less than 1%,which proves the correctness of the proposed elements.The sliding characteristics should be considered in the practical engineering because of the significant difference between the tensions of sliding cable elements and those of cable element without considering sliding.The out-of-plane stiffness coefficient and friction characteristics do not obviously affect the cable tensions. 展开更多
关键词 transmission lines sliding cable element updated Lagrangian formulation geometric nonlinearity mechanical response
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Quench characteristics and mechanical responses during quench propagation in rare earth barium copper oxide pancake coils 被引量:2
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作者 Mengdie NIU Jing XIA +1 位作者 Huadong YONG Youhe ZHOU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2021年第2期235-250,共16页
Quench and mechanical behaviors are critical issues in high temperature superconducting(HTS)coils.In this paper,the quench characteristics in the rare earth barium copper oxide(REBCO)pancake coil at 4.2K are analyzed,... Quench and mechanical behaviors are critical issues in high temperature superconducting(HTS)coils.In this paper,the quench characteristics in the rare earth barium copper oxide(REBCO)pancake coil at 4.2K are analyzed,and a two-dimensional(2D)axisymmetric electro-magneto-thermal model is presented.The effects of the constituent materials,background field,and coil size are analyzed.An elastoplastic mechanical model is used to study the corresponding mechanical responses during the quench propagation.The variations of the temperature and strain in superconducting layers are compared.The results indicate that the radial strain evolutions can reflect the transverse quench propagation and the tensile hoop and radial stresses in superconducting layers increase with the quench propagation.The possible damages are discussed with the consideration of the effects of the background field and coil size.It is concluded that the high background field significantly increases the maximum tensile hoop and radial stresses in quenching coils and local damage may be caused. 展开更多
关键词 rare earth barium copper oxide(REBCO)pancake coil hoop stress quench characteristic mechanical response radial stress
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Transcriptional activation of glucose transporter 1 in orthodontic tooth movement-associated mechanical response 被引量:2
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作者 Yu Wang Qian Li +5 位作者 Fuliang Liu Shanshan Jin Yimei Zhang Ting Zhang Yunyan Zhu Yanheng Zhou 《International Journal of Oral Science》 SCIE CAS CSCD 2018年第4期244-252,共9页
The interplay between mechanoresponses and a broad range of fundamental biological processes, such as cell cycle progression,growth and differentiation, has been extensively investigated. However, metabolic regulation... The interplay between mechanoresponses and a broad range of fundamental biological processes, such as cell cycle progression,growth and differentiation, has been extensively investigated. However, metabolic regulation in mechanobiology remains largely unexplored. Here, we identified glucose transporter 1(GLUT1)—the primary glucose transporter in various cells—as a novel mechanosensitive gene in orthodontic tooth movement(OTM). Using an in vivo rat OTM model, we demonstrated the specific induction of Glut1 proteins on the compressive side of a physically strained periodontal ligament. This transcriptional activation could be recapitulated in in vitro cultured human periodontal ligament cells(PDLCs), showing a time-and dose-dependent mechanoresponse. Importantly, application of GLUT1 specific inhibitor WZB117 greatly suppressed the efficiency of orthodontic tooth movement in a mouse OTM model, and this reduction was associated with a decline in osteoclastic activities. A mechanistic study suggested that GLUT1 inhibition affected the receptor activator for nuclear factor-κ B Ligand(RANKL)/osteoprotegerin(OPG)system by impairing compressive force-mediated RANKL upregulation. Consistently, pretreatment of PDLCs with WZB117 severely impeded the osteoclastic differentiation of co-cultured RAW264.7 cells. Further biochemical analysis indicated mutual regulation between GLUT1 and the MEK/ERK cascade to relay potential communication between glucose uptake and mechanical stress response. Together, these cross-species experiments revealed the transcriptional activation of GLUT1 as a novel and conserved linkage between metabolism and bone remodelling. 展开更多
关键词 Transcriptional activation of glucose transporter 1 in orthodontic tooth movement-associated mechanical response OTM RANKL
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Finite element simulation for mechanical response of surface mounted solder joints under different temperature cycling 被引量:1
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作者 马鑫 钱乙余 《中国有色金属学会会刊:英文版》 CSCD 2001年第4期471-474,共4页
Nonlinear finite element simulation for mechanical response of surface mounted solder joint under different temperature cycling was carried out. Seven sets of parameters were used in order to evaluate the influence of... Nonlinear finite element simulation for mechanical response of surface mounted solder joint under different temperature cycling was carried out. Seven sets of parameters were used in order to evaluate the influence of temperature cycling profile parameters. The results show that temperature cycling history has significant effect on the stress response of the solder joint. Based on the concept of relative damage stress proposed by the authors, it is found that enough high temperature holding time is necessary for designing the temperature cycling profile in accelerated thermal fatigue test. 展开更多
关键词 finite element simulation surface mounted solder joint thermal cycling mechanical response
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Mechanical responses of the bio-nano interface: A molecular dynamics study of graphene-coated lipid membrane 被引量:3
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作者 Zhigong Song Yanlei Wang Zhiping Xu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2015年第6期231-235,共5页
Bio-nano interfaces between biological materials and functional nanodevices are of vital importance in relevant energy and information exchange processes, which thus demand an in-depth understanding. One of the critic... Bio-nano interfaces between biological materials and functional nanodevices are of vital importance in relevant energy and information exchange processes, which thus demand an in-depth understanding. One of the critical issues from the application viewpoint is the stability of the bio-nano hybrid under mechanical perturbations. In this work we explore mechanical responses of the interface between lipid bilayer and graphene under hydrostatic coating provides remarkable resistance to the pressure or indentation loads, We find that graphene loads, and the intercalated water layer offers additional protection. These findings are discussed based on molecular dynamics simulation results that elucidate the molecular level mechanisms, which provide a basis for the rational design of bionanotechnology- enabled aoolications such as biomedical devices and nanotheraoeutics. 展开更多
关键词 Cell membrane Lipid bilayer Graphene mechanical responses Bio-nano interfaces
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Parametric Study on the Effect of Aspect Ratio of Selected Cooling Hole Geometries on the Mechanical Response of an Automobile Aluminium Alloy Wheel 被引量:2
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作者 S. O. Igbudu D. A. Fadare 《Open Journal of Applied Sciences》 2021年第1期41-57,共17页
Aluminium alloy wheels are increasingly popular for their light weight and good thermal conductivity. Cooling Holes (CH) are introduced to reduce their weight without compromising structural integrity. Literature is s... Aluminium alloy wheels are increasingly popular for their light weight and good thermal conductivity. Cooling Holes (CH) are introduced to reduce their weight without compromising structural integrity. Literature is sparse on the effect of aspect ratio (AR) of CHs on wheels. This, work, therefore, attempts to undertake a parametric study of the effect of aspect ratio (AR) on the mechanical response of an aluminium alloy wheel with triangular, quadrilateral and oval-shaped CHs. Three-dimensional wheel models (6JX14H2ET42) with triangular, quadrilateral and oval shaped CH (each with CH area of 2229 mm<sup>2</sup>) were generated, discretized, and analyzed by FEM using Creo Elements/Pro 5.0 to determine the mechanical response at the inboard bead seat at different ARs of 1, 0.5, 0.33 and 0.25, each for quadrilateral-CH and oval-CH, at a static Radial Load of 4750 N and Inflation Pressures of 0.3 and 0.15 MPa, respectively. The study shows that the magnitude of stress and displacement is affected by shape and AR of CH. From the results, it could be established that oval-shaped-CH wheel at AR of 0.5 offers greater prospect in wheel design as it was least stressed and deformed and, that the CH combination with highest integrity was the oval-CH and quadrilateral-CH at AR of 0.5. 展开更多
关键词 Aspect ratio mechanical response. Aluminum alloy wheel
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The mechanical response of multi-tower continuous-span suspension bridge deck pavement based on whole bridge analysis
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作者 Li Hongtao Zhang Chenchen +1 位作者 Hu Jing Qian Zhendong 《Engineering Sciences》 EI 2011年第2期88-92,共5页
The effect of multiple span suspension structure on the mechanical response of bridge deck pavement was studied, and finite element analysis (FEM) of stress and strain of pavement according to the bridge floor system ... The effect of multiple span suspension structure on the mechanical response of bridge deck pavement was studied, and finite element analysis (FEM) of stress and strain of pavement according to the bridge floor system features of super-long and high flexibility was made. Meanwhile, the FEM results were compared with those of the single span suspension structure. Three-stage analytic hierarchy process (AHP) is developed to analyze the mechanical response including whole bridge analysis, partial beams section analysis and orthotropic plate analysis. The most unfavorable load position was determined by the numerical solutions acquired from each stage to study the main mechanical index of multiple span suspension structure. The FEM results showed that the mechanical response numerical solutions by using the three-stage AHP are greater than those by simplified boundary condition, and the force condition of multiple span suspension structure is worse than that of the single span suspension structure. 展开更多
关键词 the multiple span suspension structure a three-stage analytic hierarchy process finite element analysis (FEM) the mechanical response of bridge deck pavement
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Mechanical response of a tunnel subjected to strike-slip faulting processes,based on a multi-scale modeling method
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作者 Guoguo LIU Ping GENG +3 位作者 Tianqiang WANG Xiangyu GUO Jiaxiang WANG Ti DING 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2024年第8期1281-1295,共15页
The stick-slip action of strike-slip faults poses a significant threat to the safety and stability of underground structures.In this study,the north-east area of the Longmenshan fault,Sichuan,provides the geological b... The stick-slip action of strike-slip faults poses a significant threat to the safety and stability of underground structures.In this study,the north-east area of the Longmenshan fault,Sichuan,provides the geological background;the rheological characteristics of the crustal lithosphere and the nonlinear interactions between plates are described by Burger’s viscoelastic constitutive model and the friction constitutive model,respectively.A large-scale global numerical model for plate squeezing analysis is established,and the seemingly periodic stick-slip action of faults at different crust depths is simulated.For a second model at a smaller scale,a local finite element model(sub-model),the time history of displacement at a ground level location on the Longmenshan fault plane in a stick-slip action is considered as the displacement loading.The integration of these models,creating a multi-scale modeling method,is used to evaluate the crack propagation and mechanical response of a tunnel subjected to strike-slip faulting.The determinations of the recurrence interval of stick-slip action and the cracking characteristics of the tunnel are in substantial agreement with the previous field investigation and experimental results,validating the multi-scale modeling method.It can be concluded that,regardless of stratum stiffness,initial cracks first occur at the inverted arch of the tunnel in the footwall,on the squeezed side under strike-slip faulting.The smaller the stratum stiffness is,the smaller the included angle between the crack expansion and longitudinal direction of the tunnel,and the more extensive the crack expansion range.For the tunnel in a high stiffness stratum,both shear and bending failures occur on the lining under strike-slip faulting,while for that in the low stiffness stratum,only bending failure occurs on the lining. 展开更多
关键词 stick-slip action plate squeezing analysis multi-scale modeling method lining cracking mechanical response
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Longitudinal mechanical response of tunnels under active normal faulting 被引量:8
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作者 Yafei Qiao Jie Tang +1 位作者 Guozhao Liu Manchao He 《Underground Space》 SCIE EI 2022年第4期662-679,共18页
This paper aims to clarify the mechanism of the longitudinal response of a tunnel under normal faulting via a comprehensive analysis of available experimental data and numerical simulations.Four 1 g condition model te... This paper aims to clarify the mechanism of the longitudinal response of a tunnel under normal faulting via a comprehensive analysis of available experimental data and numerical simulations.Four 1 g condition model tests were reviewed and reanalysed to highlight the key characteristics of the tunnel response under normal faulting:S-shaped deformation and inverted S-shaped bending strain distribution in the longitudinal direction;the main affected zone of faulting is approximately six times the tunnel diameter to the fault plane.A threedimensional finite element model was also established and verified,followed by a sensitivity analysis of key parameters,including the fault dislocation,dip angle,tunnel rigidity and relative stiffness between the hanging wall and footwall.All results reveal that the longitudinal mechanical response under normal faulting is dominated by a combination of bending,tension,and shearing.Bending and shearing are induced by the large unbalanced rock pressure at the vault in the hanging wall and the inverted arch in the footwall;the value of unbalanced rock pressure is directly proportional to the dislocation but negatively correlated with the dip angle.Although the main part of the tunnel stays in tension,axial compressive strain exists around the fault plane when the dip angle is greater than 70 °,which may be related to the ovaling effect of the tunnel.Such an ovaling effect is caused by the compression at the cross-section of the tunnel and may lead to more complicated internal strain. 展开更多
关键词 Longitudinal mechanical response TUNNEL Active normal faulting Numerical simulation Sensitivity analysis
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Analysis and finite element simulation for mechanical response of wheat to wind and rain loads 被引量:4
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作者 Liang Li Guo Yuming 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2008年第1期82-88,共7页
The morphological characteristics and stalk biomechanical properties at the dough stage of wheat were determined using the variety of wheat in the breeding process.Their mechanical responses to wind and rain loads for... The morphological characteristics and stalk biomechanical properties at the dough stage of wheat were determined using the variety of wheat in the breeding process.Their mechanical responses to wind and rain loads for an individual and a group of wheat were simulated using finite element method by ANSYS.The stress and displacement of each finite element can be outputted through stress nephogram and displacement nephogram,respectively.In order to judge whether the wheat could return to its original position after deformation,elastic mechanics theory was utilized to analyze the critical load of instability under both axial rain load and transverse wind load.The large displacement situation was analyzed with large displacement elastic nonlinear theory and the numerical value was obtained by ANSYS.The results show that it is possible to apply various load types on models using ANSYS and the dynamic response can be simulated well under different rain and wind loads.The location of maximum Von Mises stress can be calculated and the variation of stress can be described clearly,which are helpful to predict the wheat lodging under wind and rain loads. 展开更多
关键词 WHEAT wind and rain loads finite element analysis mechanical response
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Numerical Study of the Mechanical Response of Turtle Shell 被引量:4
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作者 Wei Zhang Chengwei Wu +1 位作者 Chenzhao Zhang Zhen Chen 《Journal of Bionic Engineering》 SCIE EI CSCD 2012年第3期330-335,共6页
The turtle shell is an amazing structure optimized through the long-term evolution by nature. This paper reports the me- chanical respor/se of the shell (Red-ear turtle) to static and dynamic loads, respectively. It... The turtle shell is an amazing structure optimized through the long-term evolution by nature. This paper reports the me- chanical respor/se of the shell (Red-ear turtle) to static and dynamic loads, respectively. It is found that the turtle shell under a compressive load yields the maximum vertical displacement at the rear end, but the vertical displacement at the front end is only half of that at the rear end. The maximum horizontal displacement of the shell also occurs at the rear end. It is believed that such a deformation pattern is helpful for protecting the turtle's internal organs and its head. The principal stress directions in the inside surface of the shell under a compressive load are almost the same as those of the biofiber distribution in the inside surface, which results in the strong bending resistance of the turtle shell. 展开更多
关键词 biomaterial turtle shell mechanical response static and dynamic loads
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Orientation-Dependent Mechanical Responses and Plastic Deformation Mechanisms of FeMnCoCrNi High-entropy Alloy:A Molecular Dynamics Study 被引量:2
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作者 Hai-Feng Zhang Hai-Le Yan +1 位作者 Feng Fang Nan Jia 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2021年第11期1511-1526,共16页
Mechanical properties of high-entropy alloys(HEAs)with the face-centered cubic(fcc)structure strongly depend on their initial grain orientations.However,the orientation-dependent mechanical responses and the underlyin... Mechanical properties of high-entropy alloys(HEAs)with the face-centered cubic(fcc)structure strongly depend on their initial grain orientations.However,the orientation-dependent mechanical responses and the underlying plastic fl ow mechanisms of such alloys are not yet well understood.Here,deformation of the equiatomic FeMnCoCrNi HEA with various initial orientations under uniaxial tensile testing has been studied by using atomistic simulations,showing the results consistent with the recent experiments on fcc HEAs.The quantitative analysis of the activated deformation modes shows that the initiation of stacking faults is the main plastic deformation mechanism for the crystals initially oriented with[001],[111],and[112],and the total dislocation densities in these crystals are higher than that with the[110]and[123]orientations.Stacking faults,twinning,and hcp-martensitic transformation jointly promote the plastic deformation of the[110]orientation,and twinning in this crystal is more significant than that with other orientations.Deformation in the crystal oriented with[123]is dominated by the hcp-martensite transformation.Comparison of the mechanical behaviors in the FeMnCoCrNi alloy and the conventional materials,i.e.Cu and Fe50Ni50,has shown that dislocation slip tends to be activated more readily in the HEA.This is attributed to the larger lattice distortion in the HEA than the low-entropy materials,leading to the lower critical stress for dislocation nucleation and elastic–plastic transition in the former.In addition,the FeMnCoCrNi HEA with the larger lattice distortion leads to an enhanced capacity of storing dislocations.However,for the[001]-oriented HEA in which dislocation slip and stacking fault are the dominant deformation mechanisms,the limited deformation modes activated are insu fficient to improve the work hardening ability of the material. 展开更多
关键词 High-entropy alloy Molecular dynamics study mechanical response Plastic deformation mechanism
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Mechanical Response of Conductor on Round Core(CORC)Cables Under Electromagnetic Force 被引量:2
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作者 Junfeng Wu Donghui Liu +1 位作者 Xingyi Zhang Huadong Yong 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2023年第3期418-427,共10页
The conductor on round core(CORC)cables are fabricated with multilayer high-temperature superconductor tapes,which are helically wound around a circular central former.The large Lorentz force will be generated by the ... The conductor on round core(CORC)cables are fabricated with multilayer high-temperature superconductor tapes,which are helically wound around a circular central former.The large Lorentz force will be generated by the transport current in CORC cables under high magnetic field,which will affect the stress and strain distributions of tapes in the cables and the performance of superconducting tape.This paper establishes a two-dimensional axisymmetric model to analyze the mechanical response of CORC cables subjected to the Lorentz force and analyzes the influence of air gaps on stress and strain distributions inside the cables.The T-A method is used to calculate the distributions of current density,magnetic field and the Lorentz force in CORC cables.The mechanical response of CORC cables is analyzed by applying the Lorentz force as an external load in the mechanical model.The direction of electromagnetic force is analyzed in CORC cables with and without shielding current,and the results show that the shielding current can lead to the concentration of electromagnetic force.The maximum stress and strain occur on both sides of the superconducting tapes in the cables with shielding current.Reducing the size of air gaps can reduce the stress and strain in the superconducting layers.The analysis of mechanical response of CORC cables can play an important role in optimizing the design of CORC cables and improving transmission performance. 展开更多
关键词 CORC cables Electromagnetic force mechanical response Air gaps
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Analytical method for the mechanical response of buried pipeline under the action of strike-slip faulting 被引量:2
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作者 Zhiping Hu Xiang Ren +2 位作者 Qiyao Wang Rui Wang Rui Pan 《Underground Space》 SCIE EI 2022年第2期268-277,共10页
Buried pipelines are commonly damaged when laid across strike-slip faults,always leading to some level of destruction with fault movement.The moment of the neutral axis of a pipe section was obtained by integration,an... Buried pipelines are commonly damaged when laid across strike-slip faults,always leading to some level of destruction with fault movement.The moment of the neutral axis of a pipe section was obtained by integration,and the equations for the bending moment and the bending strain on a pipeline’s section were presented here,based on a trilinear stress–strain model.The calculation method for the lateral soil pressure and pipeline’s bending strain near the fault-crossing point was improved.Lateral soil pressure was regarded as being related to lateral pipeline movement and,for accurate calculation,this part of the pipeline was divided into finite element segments.An iterative process for solving for pipe bending strain was derived,and the algorithm and program for calculating bending strain and the potential damage position of the pipeline’s sections was compiled based on Matlab software.Compared with finite element method(FEM)results and the current standard method,in the situation of a pipeline being in tension under the action of a strike-slip fault(intersection angle<90),the result of the proposed method is in good agreement with FEM results.This shows that the proposed analytical method possessed a good reference value for the strain response analysis of tensile steel pipelines under strike-slip faulting. 展开更多
关键词 Strike-slip fault Buried pipeline Analytical method mechanical response
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Structural design and mechanical responses of closely spaced super-span double tunnels in strongly weathered tuff strata 被引量:1
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作者 Jiaxin HE Shaohui HE +1 位作者 Xiabing LIU Jinlei ZHENG 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2022年第6期685-703,共19页
This paper presents a study of closely spaced double tunnels in Taizhou,China.One is Xiabei Mountain No.2 four-line super-span high-speed railway tunnel(HRT),and the other is Xiabei Mountain double-line large-span sub... This paper presents a study of closely spaced double tunnels in Taizhou,China.One is Xiabei Mountain No.2 four-line super-span high-speed railway tunnel(HRT),and the other is Xiabei Mountain double-line large-span subway tunnel(ST).The excavation spans of HRT and ST are 26.3 and 14 m,respectively.The two tunnels are located at different levels,and their separating distance is 17.2 m.Due to the short construction period,the HRT excavation was completed earlier than ST.The structural design of the HRT,taking account of the disturbance by the ST construction,was analyzed by a numerical simulation.It was found that the“yielding principle”design was more feasible than the“resistance principle”design when considering the safety and durability of the HRT secondary lining.The mechanical responses of the HRT during ST construction were comprehensively monitored and analyzed,including the vault settlement,horizontal convergence,surrounding rock pressure,and the internal stress in shotcrete and steel arch.Results show that the longitudinal influence range of the ST construction on the HRT was approximately 0.6–1.1 times the ST outer diameter;the disturbance was mainly generated in the ST upper bench excavation;and the final axial force of the HRT shotcrete was approximately 9–16 times that of the steel arch,which indicated that the shotcrete was the main bearing structure.The safety status of the HRT was assessed based on the monitoring data,and the minimum safety factors of the HRT shotcrete and steel arch were 1.61 and 1.89,respectively.Parametric studies were performed to show how the lining stress of HRT was affected by the relative angle,pillar width,ST excavation method and excavation footage.Finally,the design and construction optimization were proposed according to the monitoring data and parameter analysis results.This study might provide practical reference for similar projects. 展开更多
关键词 double tunnels SUPER-SPAN structural design mechanical response numerical simulation field monitoring
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