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一种桥梁裂缝修补改性材料粘接强度及受力影响分析 被引量:1
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作者 李振基 李建飞 李旭东 《粘接》 CAS 2024年第3期15-18,共4页
为解决重载运输下桥梁裂缝修补问题,试验制备了一种苯丙乳液(SAE)改性超细混凝土修补材料。结果表明,SAE含量增加会使试件抗折强度先升后降,抗压强度下降,界面粘接性能和抗疲劳性能提高;当添加15%SAE时,材料极限拉应力、拉应变分别为2.3... 为解决重载运输下桥梁裂缝修补问题,试验制备了一种苯丙乳液(SAE)改性超细混凝土修补材料。结果表明,SAE含量增加会使试件抗折强度先升后降,抗压强度下降,界面粘接性能和抗疲劳性能提高;当添加15%SAE时,材料极限拉应力、拉应变分别为2.34 MPa、2.25%,增幅分别为81.4%和562%,材料韧性提高;SAE含量12%最为适宜,此时,修补材料的极限拉应力、拉应变分别为1.78 MPa、2.02%,界面粘接强度为1.9 MPa,凝结时间短,抗疲劳性能良好。试验制备的SAE改性修补材料可以作为不中断交通重载运输情况下的桥梁裂缝修补材料使用。 展开更多
关键词 苯丙乳液 混凝土 应拉力 界面粘接强度 耐久性
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In-situ thermal Raman mapping and stress analysis of CNT/CF/epoxy interfaces
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作者 HE Jing-zong CHEN Shi +2 位作者 MA Zheng-kun LU Yong-gen WU Qi-lin 《新型炭材料(中英文)》 SCIE EI CAS CSCD 北大核心 2024年第4期703-714,共12页
A study of the interfacial behavior and internal thermal stress distribution in fiber-reinforced composites is essential to assess their performance and reliability.CNT/carbon fiber(CF)hybrid fibers were constructed u... A study of the interfacial behavior and internal thermal stress distribution in fiber-reinforced composites is essential to assess their performance and reliability.CNT/carbon fiber(CF)hybrid fibers were constructed using electrophoretic deposition.The interfacial properties of CF/epoxy and CNT/CF/epoxy composites were statistically investigated and compared using in-situ thermal Raman mapping by dispersing CNTs as a Raman sensing medium(CNT_(R))in a resin.The associated local thermal stress changes can be simulated by capturing the G'band position distribution of CNT_(R) in the epoxy at different temperatures.It was found that the G'band shifted to lower positions with increasing temperature,reaching a maximum difference of 2.43 cm^(−1) at 100℃.The interfacial bonding between CNT/CF and the matrix and the stress distribution and changes during heat treatment(20-100℃)were investig-ated in detail.This work is important for studying thermal stress in fiber-reinforced composites by in-situ thermal Raman mapping technology. 展开更多
关键词 Thermal Raman mapping Stress distribution Carbon fiber Carbon nanotube Interface
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Effects of stress state on texture and microstructure in cold drawing-bulging of CP-Ti sheet 被引量:3
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作者 李宏伟 张下陆 +1 位作者 陈甲元 李金山 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第1期23-31,共9页
Three different stress states of the combination of tensile(t) stress and compressive(c) stress,t t,t c and t c c,exist in the deformed commercially pure titanium(CP-Ti) sheet during cold drawing-bulging.The tex... Three different stress states of the combination of tensile(t) stress and compressive(c) stress,t t,t c and t c c,exist in the deformed commercially pure titanium(CP-Ti) sheet during cold drawing-bulging.The textures and microstructures in the different stress state regions were investigated by means of XRD and TEM analysis.Similar development of texture and microstructure is achieved with less thickness strain under multiaxial stresses in drawing-bulging than in cold rolling.The results show that texture and microstructure are much sensitive to multiaxial stresses.Twinning is more easily activated under compressive stress than tensile stress.Prism a slip is heavily affected by tensile stress,resulting in a remarkable change of the intensity of(0°,35°,0°) texture,while pyramidal c+a slip,forming(20°,35°,30°) texture,weakens with the increase of thickness strain in spite of stress state. 展开更多
关键词 titanium alloy TEXTURE twinning MICROSTRUCTURE DRAWING stress state cold rolling drawing-bulging
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Numerical analysis of crack generation within embankment built on expansive soil foundation 被引量:2
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作者 程永振 黄晓明 +1 位作者 李昶 李连友 《Journal of Southeast University(English Edition)》 EI CAS 2017年第2期224-229,共6页
In order to analyze the initial cracking behavior of highway embankment in the regions of expansive soil, the changes in peaks of tensile stress and their location on top of the embankment for a typical highway embank... In order to analyze the initial cracking behavior of highway embankment in the regions of expansive soil, the changes in peaks of tensile stress and their location on top of the embankment for a typical highway embankment section were simulated by ABAQUS. The simulation results indicate that the matric suction was a concave distribution on top of the expansive soil foundation and that it induced differential deformation of foundation and embankment. The peaks of tensile stress on top of the embankment are not located at a fixed site, but gradually move towards the shoulder following the evaporation duration. When the evaporation intensity is larger, the peak of tensile stress on top of embankment increases at a faster rate following the evaporation duration,and its location is closer to the shoulder. The thicker expansive soil layer helps the peaks of tensile stress to reach the critical tensile stress quickly, but the embankment cannot crack when the expansive soil layer is no more than 1.5m after 30d soil surface evaporation; the higher the embankment, the smaller the peak of tensile stress occurring on top of the highway embankment, and its location will be further away from the shoulder. Therefore, a higher embankment constructed on a thinner expansive soil layer can reduce the crack generation within the highway embankment. 展开更多
关键词 expansive soil foundation soil shrinkage CONSOLIDATION tensile stress embankment cracks
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Tensile deformation behaviors of pure nickel fine wire with a few grains across diameter 被引量:1
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作者 王传杰 王春举 +4 位作者 徐杰 张鹏 单德彬 郭斌 王振龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1765-1774,共10页
Size effects on plastic deformation behaviors in uniaxial micro tension of pure nickel fine wires were investigated experimentally, including flow stress and inhomogeneous deformation behaviors. It is found that with ... Size effects on plastic deformation behaviors in uniaxial micro tension of pure nickel fine wires were investigated experimentally, including flow stress and inhomogeneous deformation behaviors. It is found that with the increase of grain size or the decrease of number of grains across the diameter, the flow stress decreases and inhomogeneous deformation degree increases. When there are less than 9.3 grains across the diameter, the flow stress decreases quickly with the increase of grain size. Then, the flow stress size effect in micro tension of fine wires is revealed by a proposed model by introducing the grain boundary size factor. These results also indicate that both the fracture strain and stress decrease with the increase of grain size. When there are less than 14.7 grains across the diameter, both the fracture strain and stress decrease quickly. This indicates that the inhomogeneous deformation degree in micro tension increases with the decrease of the number of grains across the diameter. The fracture topography tends to be more and more irregular with the decrease of the number of grains across the diameter. Then, the formation mechanism of irregular fracture topography was analyzed considering the inhomogeneous distribution of microstructure when there are a few grains across the diameter. 展开更多
关键词 nickel wire size effect micro tension flow stress inhomogeneous deformation fracture
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Mechanical model for failure modes of rock and soil under compression 被引量:2
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作者 汤连生 桑海涛 +2 位作者 宋晶 罗珍贵 孙银磊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第10期2711-2723,共13页
The failure modes of rock and soil under compression are complex phenomena that have not been explained in a mechanical perspective. However, large amounts of studies indicate that the failure modes of rock and soil s... The failure modes of rock and soil under compression are complex phenomena that have not been explained in a mechanical perspective. However, large amounts of studies indicate that the failure modes of rock and soil samples can be categorized into eight types. In this work, the inner tensile stress and the dissipation and conversion of energy of rock and soil under compression are analyzed, then the effective conversion coefficient of energy is deduced, thus the tensile failure criterion of rock and soil under compression is established. Combined with the shear strength criterion of Mohr–Coulomb, a tensile joint shear strength criterion for rock and soil under compression is built. Therefore, a mechanical criterion model concerning the failure modes of rock and soil under compression is established and verified by tests. This model easily explains the test results in the existing literature and many natural phenomena, such as collapse. 展开更多
关键词 failure mode inner tensile stress tensile failure effective conversion coefficient of energy mechanical criteria
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Effects of parameters of asphalt concrete surfacing on mechanical property of paving layer 被引量:6
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作者 钱振东 黄卫 《Journal of Southeast University(English Edition)》 EI CAS 2003年第1期79-82,共4页
The important parameters that influence the mechanical property of the pavinglayer on an orthotropic steel bridge deck are the paving layer thickness and modulus of the asphaltconcrete surfacing. Three important indic... The important parameters that influence the mechanical property of the pavinglayer on an orthotropic steel bridge deck are the paving layer thickness and modulus of the asphaltconcrete surfacing. Three important indices that control the typical failures of the paving layerare the maximum tensile stress of paving layer, the maximum shear stress between the steel deck andthe paving layer, and the maximum deflection on the paving surface. In this paper, the analyticalmodel of paving systems on orthotropic steel bridge deck is established, and the finite elementmethod is adopted to study the stress and strain of paving system. With the variation of asphaltconcrete modulus in high or low temperature season, the influences of paving layer thickness onthree control indices are researched. The results provide a theoretical basis for the determinationof thickness of the paving layer on the steel bridge deck. 展开更多
关键词 paving layer othotropic steel deck stress strain surface deflection finite element
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张弦结构的新型拱结构桥梁的可行性研究
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作者 杨季林 姚佳杰 +3 位作者 俞钧凯 陈恩怡 李佳欢 颜喜林 《科技资讯》 2020年第30期50-52,共3页
该文在传统拱结构的基础上,又基于张弦结构的原理,在拱腹下添加了张弦结构,通过拉索的预应拉力来平衡拱结构受压后的水平推力,以此来提升拱结构的承载能力,最后得到一个新型的拱结构桥梁。基于新型拱结构桥梁的设计,建立结构midas Civi... 该文在传统拱结构的基础上,又基于张弦结构的原理,在拱腹下添加了张弦结构,通过拉索的预应拉力来平衡拱结构受压后的水平推力,以此来提升拱结构的承载能力,最后得到一个新型的拱结构桥梁。基于新型拱结构桥梁的设计,建立结构midas Civil三维模型并且控制其与传统拱结构的参数信息一致,并施加荷载。实验数据表明,新型拱结构的拉杆能够有效地平衡一部分水平推力,以此提升整体的承载能力、整体刚度和稳定性。 展开更多
关键词 新型拱结构 应拉力 张弦结构 桥梁
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Evaluation on residual stresses of silicon-doped CVD diamond films using X-ray diffraction and Raman spectroscopy 被引量:10
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作者 陈苏琳 沈彬 +2 位作者 张建国 王亮 孙方宏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期3021-3026,共6页
The effect of silicon doping on the residual stress of CVD diamond films is examined using both X-ray diffraction (XRD) analysis and Raman spectroscopy measurements. The examined Si-doped diamond films are deposited o... The effect of silicon doping on the residual stress of CVD diamond films is examined using both X-ray diffraction (XRD) analysis and Raman spectroscopy measurements. The examined Si-doped diamond films are deposited on WC-Co substrates in a home-made bias-enhanced HFCVD apparatus. Ethyl silicate (Si(OC2H5)4) is dissolved in acetone to obtain various Si/C mole ratio ranging from 0.1% to 1.4% in the reaction gas. Characterizations with SEM and XRD indicate increasing silicon concentration may result in grain size decreasing and diamond [110] texture becoming dominant. The residual stress values of as-deposited Si-doped diamond films are evaluated by both sin2ψ method, which measures the (220) diamond Bragg diffraction peaks using XRD, with ψ-values ranging from 0° to 45°, and Raman spectroscopy, which detects the diamond Raman peak shift from the natural diamond line at 1332 cm-1. The residual stress evolution on the silicon doping level estimated from the above two methods presents rather good agreements, exhibiting that all deposited Si-doped diamond films present compressive stress and the sample with Si/C mole ratio of 0.1% possesses the largest residual stress of ~1.75 GPa (Raman) or ~2.3 GPa (XRD). As the silicon doping level is up further, the residual stress reduces to a relative stable value around 1.3 GPa. 展开更多
关键词 silicon-doped diamond films silicon doping residual stress X-ray diffraction Raman spectroscopy
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IMPROVING MATERIAL REMOVAL RATE OF BRITTLE CERAMICS THROUGH HONING INCIDENTAL TENSILE STRESSES
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作者 于爱兵 徐燕申 +1 位作者 林彬 王龙山 《Transactions of Tianjin University》 EI CAS 1998年第2期41-44,共4页
The stress intensity factors and stress conditions of machining cracks are analyzed by fracture mechanics on the basis of honing characteristics and of brittle ceramic mechanical behavior.Because the honing incidental... The stress intensity factors and stress conditions of machining cracks are analyzed by fracture mechanics on the basis of honing characteristics and of brittle ceramic mechanical behavior.Because the honing incidental tensile stresses effectively decrease the critical grinding stresses and increase the stress intensity factors of machining cracks,the honing process can be carried out easily.The results show that honing can be an efficient machining method for brittle materials. 展开更多
关键词 CERAMICS HONING incidental tensile stress material removal rate
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High temperature tensile deformation behavior of AZ80 magnesium alloy 被引量:4
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作者 乔军 边福勃 +1 位作者 何敏 王瑜 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2857-2862,共6页
Tensile behaviors of an AZS0 alloy were investigated by elongation-to-failure tensile tests at 300, 350, 400 and 450 ℃, and strain rates of 10-2 and 10-3 s 1. Strain-rate-change tests from 5×10-5 s-1 to 2x10-2 s... Tensile behaviors of an AZS0 alloy were investigated by elongation-to-failure tensile tests at 300, 350, 400 and 450 ℃, and strain rates of 10-2 and 10-3 s 1. Strain-rate-change tests from 5×10-5 s-1 to 2x10-2 s-1 were applied to study deformation mechanisms. The experimental data show that the material exhibits enhanced tensile ductilities of over 100% at 400 and 450 ℃ with stress exponent of 4.29 and activation energy of 149.60 kJ/mol, and initial fine grains preserve in evenly deformed gauge based on microstructure studies. The enhanced tensile ductilities are rate controlled by a competitive mechanism of grain boundary sliding and dislocation climb creep, based on which a model can successfully simulate the deformation behavior. 展开更多
关键词 AZ80 magnesium alloy tensile behavior SUPERPLASTICITY CREEP stress exponent
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Effect of annealing temperature on joints of diffusion bonded Mg/Al alloys 被引量:11
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作者 丁云龙 王建刚 +1 位作者 赵明 巨东英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第2期251-258,共8页
To study the effect of annealing temperature on the joints between magnesium and aluminum alloys, and improve the properties of bonding layers, composite plates of magnesium alloy(AZ31 B) and aluminum alloy(6061) ... To study the effect of annealing temperature on the joints between magnesium and aluminum alloys, and improve the properties of bonding layers, composite plates of magnesium alloy(AZ31 B) and aluminum alloy(6061) were welded using the vacuum diffusion bonding method. The composite specimens were continuously annealed in an electrical furnace under the protection of argon gas. The microstructures were then observed using scanning electron microscopy. X-ray diffractometry was used to investigate the residual stresses in the specimens. The elemental distribution was analyzed with an electron probe micro analyzer. The tensile strength and hardness were also measured. Results show that the diffusion layers become wide as the heat treatment temperature increases, and the residual stress of the specimen is at a minimum and tensile strength is the largest when being annealed at 250 ℃. Therefore, 250 ℃ is the most appropriate annealing temperature. 展开更多
关键词 annealing temperature diffusion bonding diffusion layer residual stress tensile strength
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Velocity of a Liquid Drop with a Sorption-Controlled Surfactant
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作者 陈晋南 《Journal of Beijing Institute of Technology》 EI CAS 1996年第2期116+107-116,共11页
The terminal velocity of a liquid droplet settling in a sulfactant solution has been studied for the non-linear adsorption Langmuir frameworks accounting for monolayer saturation and non-ideal surfactant interactions.... The terminal velocity of a liquid droplet settling in a sulfactant solution has been studied for the non-linear adsorption Langmuir frameworks accounting for monolayer saturation and non-ideal surfactant interactions. Most prior research uses a linear adsorption model which cannot capture these effects, The Maragoni migration of a liquid drop settling through a surfactant solution is examined by using Langmuir framework. The solution concentration Ceq is assumed large enough for the surfactant mass transfer to be adsorption-controlled. Langmuir model generates non-linear Marangoni stresses which diverge in the limit of approaching ∝, strongly retarding U'. 展开更多
关键词 Marangoni stresses non-linear adsorption Langmuir isotherm phpsco-chemical hydrodynamics mass transfer dynamic surface tension
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Influence of principal stress rotation of unequal tensile and compressive stress amplitudes on characteristics of soft clay 被引量:3
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作者 SHEN Yang WANG Xin +3 位作者 LIU Han-long DU Wen-han WANG Bao-guang XU Hai-dong 《Journal of Mountain Science》 SCIE CSCD 2017年第2期369-381,共13页
Soil behavior can reflect the characteristics of principal stress rotation under dynamic wave and traffic loads. Unequal amplitudes of tensile and compressive stresses applied to soils have complex effects on foundati... Soil behavior can reflect the characteristics of principal stress rotation under dynamic wave and traffic loads. Unequal amplitudes of tensile and compressive stresses applied to soils have complex effects on foundation soils in comparison with the pure principal stress rotation path. A series of undrained cyclic hollow torsional shear tests were performed on typical remolded soft clay from the Hexi area of Nanjing, China. The main control parameters were the tensile and compressive stress amplitude ratio(α) and the cyclic dynamic stress ratio(η). It was found that the critical η tended to remain constant at 0.13, when the value of the compressive stress amplitude was higher than the tensile stress amplitude. However, the influence of the tensile stress was limited by the dynamic stress level when α= 1.For obvious structural change in the soil, the corresponding numbers of cyclic vibration cycles were found to be independent of α at low stress levels and were only related to η. Finally, a new method for evaluating the failure of remolded soft clay was presented. It considers the influence of the tensile and compressive stresses which caused by complex stress paths of the principal stress rotation. This criterion can distinguish stable, critical, and destructive states based on the pore-water-pressure-strain coupling curve while also providing a range of failure strain and vibration cycles. These results provide the theoretical support for systematic studies of principal stress rotation using constitutive models. 展开更多
关键词 Complex stress path Principal stress rotation Train loads Amplitude ratio Cyclic dynamic stress ratio Failure criterion
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Stress Analysis of Top Tensioned Riser Under Random Waves and Vessel Motions 被引量:11
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作者 LI Xiaomin GUO Haiyan MENG Fanshun 《Journal of Ocean University of China》 SCIE CAS 2010年第3期251-256,共6页
The bending stresses of top tensioned riser(TTR) under combined excitations of currents,random waves and vessel motions are presented in this paper,and the effect of the internal flowing fluid on the riser stresses is... The bending stresses of top tensioned riser(TTR) under combined excitations of currents,random waves and vessel motions are presented in this paper,and the effect of the internal flowing fluid on the riser stresses is also considered.The computation programs which are used to solve the differential equations in the time domain are compiled and the principal factors of concern including the angular movements at the upper and lower ends of the riser,lateral displacements and bending stresses are presented.Then the effects of current velocity,random wave,top tension,vessel mean offset,low frequency motion and internal flow velocity on the bending stresses of the riser are analyzed in detail. 展开更多
关键词 top tensioned riser (TTR) internal flow vessel motion dynamic response
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Mechanical properties and stress corrosion cracking behaviour of AZ31 magnesium alloy laser weldments 被引量:5
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作者 P.B.SRINIVASAN S.RIEKEHR +2 位作者 C.BLAWERT W.DIETZEL M.KO AK 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期1-8,共8页
An AZ31 HP magnesium alloy was laser beam welded in autogenous mode with AZ61 filler using Nd-YAG laser system.Microstructural examination revealed that the laser beam weld metals obtained with or without filler mater... An AZ31 HP magnesium alloy was laser beam welded in autogenous mode with AZ61 filler using Nd-YAG laser system.Microstructural examination revealed that the laser beam weld metals obtained with or without filler material had an average grain size of about 12 μm.The microhardness and the tensile strength of the weldments were similar to those of the parent alloy.However,the stress corrosion cracking (SCC) behaviour of both the weldments assessed by slow strain rate tensile (SSRT) tests in ASTM D1384 solution was found to be slightly inferior to that of the parent alloy.It was observed that the stress corrosion cracks originated in the weld metal and propagated through the weld metal-HAZ regions in the autogenous weldment.On the other hand,in the weldment obtained with AZ61 filler material,the crack initiation and propagation was in the HAZ region.The localized damage of the magnesium hydroxide/oxide film formed on the surface of the specimens due to the exposure to the corrosive environment during the SSRT tests was found to be responsible for the SCC. 展开更多
关键词 AZ31 magnesium alloy laser welding microstructure mechanical properties slow strain rate tensile test stress corrosion cracking FRACTOGRAPHY
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Modern tectonic stress field deeply in Xuzhou Coal Mine 被引量:3
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作者 Zhen-jie JING Fu-ren XIE Xiao-feng CUl Jing-fei ZHANG 《Journal of Coal Science & Engineering(China)》 2013年第1期14-18,共5页
By inverting fault slip data, the parameters of 12 tectonic stress tensors in the mine region can be determined. The following characteristics can be obtained for recent tectonic stress fields, which are found deep in... By inverting fault slip data, the parameters of 12 tectonic stress tensors in the mine region can be determined. The following characteristics can be obtained for recent tectonic stress fields, which are found deep in the study region. The results show that the recent tectonic stress field mainly presents the characteristics of near NWW-SSE maximum compressional stress and near NE-SW minimum extensional stress, while the stress regimes are mainly of strike slip, part of the reverse-fault type. Recent tectonic stress field in the region is characterized by horizontal components. The maximum principal compression stress direction was from NEE to SEE, the average principal compression stress direction was near NWW-SSE maximum compres- sional stress and near NE-SW minimum extensional. The recent tectonic stress field of the studied area can be controlled by a large tectonic stress area. 展开更多
关键词 Xuzhou region fault slip data tectonic stress field INVERSION
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Design of Large-Scale Prestressing Bucket Foundation for Offshore Wind Turbines 被引量:24
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作者 练继建 丁红岩 +1 位作者 张浦阳 于瑞 《Transactions of Tianjin University》 EI CAS 2012年第2期79-84,共6页
The key in the force transmission between the tower and the foundation for offshore wind turbines is to transfer the large moment and horizontal loads. The finite element model of a large-scale prestressing bucket fou... The key in the force transmission between the tower and the foundation for offshore wind turbines is to transfer the large moment and horizontal loads. The finite element model of a large-scale prestressing bucket founda- tion for offshore wind turbines is set up and the structural characteristics of the arc transition structure of the founda- tion are analyzed for 40-60 channels(20-30 rows) arranged with prestressing steel strand under the same ultimate load and boundary conditions. The mechanical characteristics of the key parts of the foundation structures are illus- trated by the peak of the principal tensile stress, the peak of the principal compressive stress and the distribution areas where the principal tensile stress is larger than 2.00 MPa. It can be concluded that the maximum principal tensile stress of the arc transition decreases with the increasing number of channels, and the amplitude does not change signifi- cantly; the maximum principal compressive stress increases with the increasing number of channels and the amplitude changes significantly; however, for the distribution areas where the principal tensile stress is larger than 2.00 MPa, with different channel numbers, the phenomenon is not obvious. Furthermore, the principal tensile stress at the top of the foundation beams fluctuantly increases with the increasing number of channels and for the top cover of the bucket, the principal tensile stress decreases with the increasing number of channels. 展开更多
关键词 offshore wind power large-scale prestressing bucket foundation arc transition structural design
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Tensile properties of as-deformed 2A50 aluminum alloy in semi-solid state 被引量:8
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作者 杜之明 陈刚 +1 位作者 柳君 谢水生 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1597-1602,共6页
Tensile properties of as-deformed 2A50 aluminum alloy were investigated in the high temperature solid and semi-solid states. The results show that temperature has almost no effect on the maximum tensile stress between... Tensile properties of as-deformed 2A50 aluminum alloy were investigated in the high temperature solid and semi-solid states. The results show that temperature has almost no effect on the maximum tensile stress between 500 ℃ and 530 ℃, and the maximum tensile stress decreases rapidly when the temperature is above 532 ℃. The ductility decreases with increasing temperature and has an obvious fall when the temperature is above solidus temperature. This alloy almost has no ductility above 537 ℃, and cannot sustain tensile stress above 550℃. A brittle temperature range in which this alloy is prone to form microcracks was derived. The relation between microstructure, fraction solid and tensile properties were also investigated by examining the metallograph and fracture surface morphology of tested specimens, which could provide reference for forecasting the microcracks in this alloy occurring in semi-solid processing. 展开更多
关键词 tensile properties aluminum alloy SEMI-SOLID MICROCRACKS FORECAST
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Effects of curing age on compressive and tensile stress-strain behaviors of ecological high ductility cementitious composites 被引量:1
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作者 Chai Lijuan Guo Liping +1 位作者 Chen Bo Cao Yuanzhang 《Journal of Southeast University(English Edition)》 EI CAS 2020年第1期73-80,共8页
To obtain the design parameters of the structure made by ecological high ductility cementitious composites(Eco-HDCC),the effects of curing age on the compressive and tensile stress-strain relationships were studied.Th... To obtain the design parameters of the structure made by ecological high ductility cementitious composites(Eco-HDCC),the effects of curing age on the compressive and tensile stress-strain relationships were studied.The reaction degree of fly ash,non-evaporable water content and the pH value in pore solution were calculated to reveal the mechanical property.The results indicate that as the curing age increases,the peak compressive strength,peak compressive strain and ultimate tensile strength of Eco-HDCC increase.However,the ultimate compressive strain and ultimate tensile strain of Eco-HDCC decrease with the increase in curing age.Besides,as the curing age increases,the reaction degree of fly ash and non-evaporable water content in Eco-HDCC increase,while the pH value in the pore solution of Eco-HDCC decreases.Finally,the simplified compressive and tensile stress-strain constitutive relationship models of Eco-HDCC with a curing age of 28 d were suggested for the structure design safety. 展开更多
关键词 ecological high ductility cementitious composites(Eco-HDCC) compressive stress-strain behavior tensile stress-strain behavior curing age reaction degree non-evaporable water content pH value in pore solution
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