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Experimental and numerical study of buckling-restrained braces configured with out-of-plane eccentricity under cyclic loading
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作者 Cao Yongsheng Zhou Yun +3 位作者 Takagi Jiro Jiang Ke Deng Xuesong Fang Xiaojun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2024年第4期957-971,共15页
This study focuses on variations in the hysteretic behavior of buckling-restrained braces(BRBs)configured with or without out-of-plane eccentricity under cyclic loading.Quasi-static experiments and numerical simulatio... This study focuses on variations in the hysteretic behavior of buckling-restrained braces(BRBs)configured with or without out-of-plane eccentricity under cyclic loading.Quasi-static experiments and numerical simulations were carried out on concentrically and eccentrically loaded BRB specimens to investigate the mechanical properties,energy dissipation performance,stress distribution,and high-order deformation pattern.The experimental and numerical results showed that compared to the concentrically loaded BRBs,the stiffness,yield force,cumulated plastic ductility(CPD)coefficient,equivalent viscous damping coefficient and energy dissipation decreased,and the yield displacement and compression strength adjustment factor increased for the eccentrically loaded BRBs.With the existence of the out-of-plane eccentricity,the initial yield position changes from the yield segment to the junction between the yield segment and transition segment under a tensile load,while the initial high-order buckling pattern changes from a first-order C-shape to a secondorder S-shape under a compressive load. 展开更多
关键词 buckling-restrained brace out-of-plane eccentricity experiment numerical simulation mechanical properties
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Mechanical Properties of a Wood Flour-PET Composite Through Computational Homogenisation
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作者 P.Pesante K.Saavedra G.Pincheira 《Computers, Materials & Continua》 SCIE EI 2021年第6期4061-4079,共19页
This work proposes to study the effective elastic properties(EEP)of a wood-plastic composite(WPC)made from polyethylene terephthalate(PET)and Chilean Radiate pine’s wood our,using nite element simulations of a repres... This work proposes to study the effective elastic properties(EEP)of a wood-plastic composite(WPC)made from polyethylene terephthalate(PET)and Chilean Radiate pine’s wood our,using nite element simulations of a representative volume element(RVE)with periodic boundary conditions.Simulations are validated through a static 3-point bending test,with specimens obtained by extruding and injection.The effect of different weight fractions,space orientations and sizes of particles are here examined.Numerical predictions are empirically conrmed in the sense that composites with more wood our content and bigger size,have higher elastic modulus.However,these results are very sensitive to the orientation of particles.Voigt and Reuss mean-eld homogenisation approaches are also given as upper and lower limits.Experimental tests evidence that exural strengths and ultimate tensile elongations decrease respect to 100%PET,but these properties can be enhanced considering particle-size distributions instead of a xed size of wood our. 展开更多
关键词 Wood-plastic composite periodic homogenisation mechanical properties experimental validation
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Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications
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作者 Jiawei Chen Haibei Xiong +1 位作者 Zhifang Wang Linqing Yang 《Journal of Renewable Materials》 SCIE 2019年第11期1147-1164,共18页
Wood and wood-based composite materials have gained increasing attention in the sustainable building industry because of their renewability and environmental friendliness.Oriented oblique strand lumber(Eucalyptus Stra... Wood and wood-based composite materials have gained increasing attention in the sustainable building industry because of their renewability and environmental friendliness.Oriented oblique strand lumber(Eucalyptus Strand Wood,ESWood),which is manufactured from fast-growing small diameter eucalyptus wood(Eucalyptus urophylla×E.grandis),is introduced in this paper.Small clear specimen tests were conducted to determine the mechanical properties of ESWood material while full-scale component tests were performed to observe the structural performance of ESWood beams.A comparison of mechanical properties of ESWood with other wood/bamboo-based materials is then reported.From the results presented herein,it appears that the strength and stiffness properties of ESWood are affected by grain directionality and glued layers.However,it still has preferable mechanical properties as a building material,which is comparable or superior to those of other engineered wood/bamboo-based products(e.g.,Sitka spruce,LVL,OSL,Glulam,and Glubam).Furthermore,results from full-scale component tests show the stable mechanical performance of beams made by ESWood.This study makes a significant contribution to a potential utilization of fast-growing eucalyptus for general use in construction,and the presented mechanical tests results can serve as a fundamental data for more applications of ESWood in practical engineering. 展开更多
关键词 Wood-based composite material mechanical properties EUCALYPTUS experimental test construction material
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Mechanical Properties and Solidified Mechanism of Tailings Mortar with Waste Glass
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作者 宁宝宽 XU Jingwen CHEN Sili 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1240-1246,共7页
In order to improve the comprehensive utilization of solid waste such as iron tailings and waste glass and so on,mechanical property test of cement tailings mortar mixed waste glass and curing mechanism research were ... In order to improve the comprehensive utilization of solid waste such as iron tailings and waste glass and so on,mechanical property test of cement tailings mortar mixed waste glass and curing mechanism research were conducted in the key materials mechanics lab of Liaoning province.The experimental results show that adding waste glass particles can improve the grain size distribution of tailings.The effect is proportional to the content.The compressive strength of tailings mortar has increased significantly.The fineness modulus of tailings mortar mixture adding waste glass powder was gradually reducing with the increase of the dosage of waste glass powder,but the compressive strength of the mixture has gradually enhanced with the increase of the dosage.Microscopic analysis shows that the waste glass particles in the mortar mainly play a role of coarse aggregate and glass powder after grinding fine below a certain size shows strong volcanic activity,which can act hydration with tailings,at the same time glass powder also,plays a role in fine aggregate filling.Therefore,all of glass particles and glass powder can be used as the additive material for improving and optimizing the mechanical property of tailings mortar. 展开更多
关键词 waste glass tailings mortar mechanical property solidified mechanism experimental
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Study on Strength and Life of Anisotropic Single Crystal Blade - Part Ⅱ: Experimental Research 被引量:4
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作者 尹泽勇 成晓鸣 +2 位作者 杨治国 岳珠峰 魏朋义 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2001年第1期24-29,共6页
The single crystal blade is one of the key technologies for improving the performance, durability and reliability of aero-engines and ground gas-turbine engines. However, the anisotropic mechanical properties of the s... The single crystal blade is one of the key technologies for improving the performance, durability and reliability of aero-engines and ground gas-turbine engines. However, the anisotropic mechanical properties of the single crystal material makes a great deal of difficulties on the development and the application of the single crystal blade, which is a challenge for the engineering application of the single crystal superalloy and the theoretic bases of the application. Some researches on the strength analysis and the life prediction of the anisotropic single crystal blade were carried out by the authors' research team. They are as follows. The crystallographic constitutive models for the plastic and the creep behaviors and the method of the rupture life prediction were established and verified. The tensile or the creep experiments for DD3 single crystal alloy with different orientations under different temperatures and different tensile rates or under different temperatures and different stress levels were carried out. The experimental data and the anisotropic properties at intermediate and high temperatures revealed by the experiments are significant for the application of the single crystal alloy. In addition, the experimental research for a kind of single crystal blade was also made. As the application of the researches the strength analysis and the life prediction were carried out for the single crystal blade of a certain aeroengine. In this part, the experimental research work is describled, and the constitutive models and applications have been described in part I. 展开更多
关键词 single crystal superalloy mechanical properties simulated single crystal blade experiment
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Dynamic mechanical behavior and nonlinear hyper-viscoelastic constitutive model of SiO_(2) particle-reinforced silicone rubber composite:experimental and numerical investigation
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作者 Xihuang Zhang Xuexing Wu +4 位作者 He Yang Ying Chen Xiangli Cheng Bo Liu Hui Zhao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2024年第6期100-114,共15页
SiO_(2)-particle reinforced silicon rubber composite(SP-RSRC)is a widely utilized material that offers shock absorption protection to various engineering structures in impact environments.This paper presents a compreh... SiO_(2)-particle reinforced silicon rubber composite(SP-RSRC)is a widely utilized material that offers shock absorption protection to various engineering structures in impact environments.This paper presents a comprehensive investigation of the mechanical behavior of SP-RSRC under various strain rates,employing a combination of experimental,theoretical,and numerical analyses.Firstly,quasi-static and dynamic compression tests were performed on SP-RSRC utilizing a universal testing machine and split Hopkinson pressure bar(SHPB)apparatus.Nonlinear stress-strain relationships of SP-RSRC were obtained for strain rates ranging from 1×10^(−3) to 3065 s^(−1).The results indicated that the composite showed evident strain rate sensitivity,along with nonlinearity.Then,a nonlinear visco-hyperelastic constitutive model was developed,consisting of a hyperelastic component utilizing the 3rd-order Ogden energy function and a viscous component employing a rate-dependent relaxation time scheme.The model accurately characterized the dynamic mechanical response of SP-RSRC,effectively mitigating the challenge of calibrating an excessive number of material parameters inherent in conventional viscoelastic models.Furthermore,the simplified rubber material(SRM)model,integrated within the LS-DYNA software,was chosen to depict the mechanical properties of SP-RSRC in numerical simulations.The parameters of the SRM model were further calibrated based on the strain-stress relationships of SP-RSRC,as predicted by the developed nonlinear visco-hyperelastic constitutive model.Finally,an inverse ballistic experiment using a single-stage air gun was conducted for SP-RSRC.Numerical simulations of SHPB experiments and the inverse ballistic experiment were then performed,and the reliability of the calibrated SRM model was verified by comparing the results of experiments and numerical simulations.This study offers a valuable reference for the utilization of SP-RSRC in the realm of impact protection. 展开更多
关键词 Silicone rubber composites Dynamic mechanical properties Nonlinear visco-hyperelastic constitutive model Inverse ballistic experiment
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Experimental Research of Automotive Needlepunched Carpets at Thermoforming Temperatures
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作者 张云青 郭志英 +1 位作者 董湘怀 李德群 《Journal of Donghua University(English Edition)》 EI CAS 2007年第6期728-733,739,共7页
Tensile properties with different thermoforming conditions and deformation mechanism at thermoforming temperatures of automotive needlepunched carpets made up of three layers of different materials were reported.Inves... Tensile properties with different thermoforming conditions and deformation mechanism at thermoforming temperatures of automotive needlepunched carpets made up of three layers of different materials were reported.Investigations on the tensile properties were performed as a function of thermoforming temperature,extensile speed and fiber orientation based on an orthogonal experiment design.The experimental results show that the automotive carpets are rate-dependent anisotropic one and very sensitive to the forming temperature.The tensile properties are strongly depended on the forming temperature when compared with the extensile speed and the fiber orientation.Experiments only varying with the temperature were performed because of the dominative effect of the temperature.Different deformation performances were observed with different temperatures.Deformation mechanisms at the thermoforming temperatures were presented to explain the nonlinear trend of the ultimate elongation with the temperatures based on the combination of the experimental observations and the corresponding polymer theories. 展开更多
关键词 automotive carpet tensile property experimental research deformation meachanism
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Experimental Research on Output Performances of Giant Magnetostrictive Actuator
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作者 李国平 陈子辰 《Defence Technology(防务技术)》 SCIE EI CAS 2007年第2期156-160,共5页
The paper introduces the performances of magnetostrictive actuators and its applications,discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator,and makes test... The paper introduces the performances of magnetostrictive actuators and its applications,discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator,and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material.The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states,and can be used in low-frequency vibration control system of precise equipment. 展开更多
关键词 磁力控制 制动器 动力学 实验研究
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Experimental Research on the Mechanical Properties of Gypsum Breccia with Different Water Content 被引量:1
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作者 邓建华 黄醒春 李尤嘉 《Journal of Shanghai Jiaotong university(Science)》 EI 2010年第2期250-256,共7页
This paper deals with the influence of water content on the mechanical properties of gypsum breccia with different initial water contents. The experimental research was taken on the GDS (geotechnical digital systems) ... This paper deals with the influence of water content on the mechanical properties of gypsum breccia with different initial water contents. The experimental research was taken on the GDS (geotechnical digital systems) tri-axial experiment system by strain rate control. The mechanical properties,including stress-strain curves,peak deviator stress,relative residual strength,elastic modulus,Poisson's ratio,angle of internal friction and cohesion of gypsum breccia,were studied by experiment. The results showed that the water content has obvious infiuence on the mechanical properties of gypsum breccia. With increasing of water content,the angle of internal friction and cohesion of gypsum breccia decrease linearly. Meanwhile,the stress-strain curves go through from the declining,hump curve to the strain hardening curve. At the same confining pressure,the peak deviator stress and elastic modulus decrease exponentially,while Poisson's ratio increases linearly with the increasing of the water content. At the same water content,with increasing of the confining pressure,the peak deviator stress,elastic modulus and the peak deviator stress increase trend but Poisson's ratio decreases at a lower water content. While at a high water contents,the Poisson's ratio doesn't change much. It shows that water content plays an important role in the process of changing from the brittleness to plastic for the mechanical properties of gypsum breccia. 展开更多
关键词 gypsum breccia mechanical properties water content experimental research tri-axial test
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Experimental study on the mechanical properties of rocks at high temperature 被引量:34
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作者 ZHANG LianYing MAO XianBiao LU AiHong 《Science China(Technological Sciences)》 SCIE EI CAS 2009年第3期641-646,共6页
The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by using the MTS810 ... The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by using the MTS810 Rock Mechanics Servo-controlled Testing System under the action of temperatures ranging from room temperature to 800°C Results show that (1) the peak strength and elastic modulus of marble fluctuate at the temperature from normal to 400°C; and they decrease gradually over 400°C (2) With the rise of the temperature, the peak strength and elastic modulus of limestone show downward trend from normal temperature to 200°C have little change from 200°C to 600°C and decrease sharply over 600°C (3) The peak strength of sandstone shows a downward trend while a little change for elastic modulus at normal temperature to 200°C and from 200°C to 600°C, the peak strength of sandstone increases while a little change for elastic modulus; the peak strength and elastic modulus decrease rapidly at the temperature over 600°C. (4) The peak strain of limestone shows little change at normal temperature to 600°C, however, the peak strain increases rapidly over 600°C; and for marble and sandstone, the peak strain decreases with the rise of the temperature from normal temperature to 200°C, the peak strain increases rapidly over 200°C. The result can provide valuable references for the rock engineering design at high temperature. 展开更多
关键词 ROCK mechanICS high temperature effect mechanical properties experimental study
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Mechanical property of U-Shaped 65Mn steel bumpers for seismic base isolation 被引量:3
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作者 Han Miao Wang Yuandong +1 位作者 Du Hongkai Cui Xiangdong 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2021年第3期791-802,共12页
This study proposes a novel U-shaped 65Mn steel bumper as the displacement restraining device for base-isolated structures with laminated elastomeric rubber bearings.A series of bumpers with different geometric parame... This study proposes a novel U-shaped 65Mn steel bumper as the displacement restraining device for base-isolated structures with laminated elastomeric rubber bearings.A series of bumpers with different geometric parameters were designed and tested under monotonic and cyclic quasi-static loading protocols.The experimental results from a total of 232 specimens were analyzed to develop an analytical model to calculate the backbone curve and the maximum elastic restoring force for U-shaped 65Mn bumpers.Thus,the analytical equations to calculate the elastic,hardening,and unloading stiffness of U-shaped 65Mn bumpers,as well as their maximum elastic restoring force,are validated by using an additional ten groups of bumpers with varying radiuses.These analytical equations can accurately predict the mechanical parameters of U-shaped 65Mn steel bumpers for a design purpose. 展开更多
关键词 U-shaped bumper base isolation experimental mechanical properties analytical model
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Effect of Loading Condition and Temperature on Dynamic Properties of Asphalt Mixtures 被引量:2
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作者 张光海 ZHENG Yuanxun KANG Haigui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期309-313,共5页
In order to study the effects of loading condition and temperature on the dynamic properties of asphalt mixtures, the dynamic loading tests on different loading condition (various speeds and loads under a certain rou... In order to study the effects of loading condition and temperature on the dynamic properties of asphalt mixtures, the dynamic loading tests on different loading condition (various speeds and loads under a certain roughness) and temperature conditions were performed. The experimental result show that the dynamic properties of asphalt mixtures are influenced by vehicle load and speed, besides, the effects of temperature on dynamic properties of asphalt mixture are significant. 展开更多
关键词 asphalt mixtures ROUGHNESS dynamic properties temperature-sensitivity experiment research
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Experimental and Finite Element Analysis for Multi-lead Rubber Bearings:A Comparative Study
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作者 聂肃非 江宜城 +1 位作者 叶志雄 李黎 《Journal of Southwest Jiaotong University(English Edition)》 2010年第2期134-139,共6页
The mechanical properties of multi-lead rubber bearings (MLRBs) were investigated by experiment and finite element analysis. First, the vertical stiffness, horizontal stiffness and yielded shear force were tested fo... The mechanical properties of multi-lead rubber bearings (MLRBs) were investigated by experiment and finite element analysis. First, the vertical stiffness, horizontal stiffness and yielded shear force were tested for four MLRB specimens and two specimens of the single-lead rubber bearings ( SLRBs). Then, the MLRBs were modeled by the explicit finite element analysis software ANSYS/ LS-DYNA, in order to evaluate the horizontal force-displacement hysteretic curves under static vertical and dynamical horizontal loadings. The disagreement between the tested and theoretical values was less than 11.4%, and MLRBs and SLRBs were similar in vertical stiffness, pre-yield stiffness and yield stiffness. 展开更多
关键词 Bridge seismic isolation Multi-lead rubber bearing Nonlinear mechanical properties experimental study Explicit finite element analysis
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Study on Interface mechanical behavior of steel tube reinforced concrete composite pile
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作者 ZHAO Jiehao 《International English Education Research》 2016年第4期93-94,共2页
Currently for the steel tube reinforced concrete composite pile research, although predecessors make a comprehensive research on the composite pile beating performance, design technology, but there are still many prob... Currently for the steel tube reinforced concrete composite pile research, although predecessors make a comprehensive research on the composite pile beating performance, design technology, but there are still many problems have not been solved, such as the steel tube reinforced concrete pile composite interracial force learn performance research is still in the initial stage. In this paper, we mainly discuss the research methods of several interface mechanical properties and propose the possibility of studying the mechanical properties of the steel tube reinforced concrete composite pile by using the principle of ultrasonic speckle. 展开更多
关键词 Steel tube reinforced concrete composite pile Interface mechanical properties research methods
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Damage-ignition mechanism studies on modified propellant with different crosslinking density under dynamic loading
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作者 Hong-zheng Duan Yan-qing Wu +2 位作者 Xiao Hou Kun Yang Feng-lei Huang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第10期155-164,共10页
The study of high-energy and low-vulnerability propellants is important for the power performance and safety of solid propellant rocket motors.The modified split Hopkinson pressure bar(SHPB)tests are performed on two ... The study of high-energy and low-vulnerability propellants is important for the power performance and safety of solid propellant rocket motors.The modified split Hopkinson pressure bar(SHPB)tests are performed on two kinds of propellant with different crosslinking density to study the dynamic mechanical responses and damage-ignition mechanism.SHPB apparatus is equipped with a highperformance infrared camera and high-speed camera to capture the deformation,damage-ignition feature and temperature evolution images in the impact process.The results suggested that the mechanical responses and damage-ignition mechanism of the propellants were affected by the strain rates and crosslinking density.The damage-ignition degree is more intense and the reaction occurs earlier with the increase of strain rates.For propellant 1 with higher crosslinking density,the critical ignition strain rate is 4500 s^(-1).Two kinds of propellants show different ignition mechanism,i.e.crack generation,propagation and final fracture for propellant 1 while viscous shear flow for propellant 2.Meanwhile,the SEM images also reveal the difference of damage-ignition mechanism of the two kinds of propellants.Finally,the ignition mechanism under different strain rates and critical ignition strain rate of propellants are further explained by the theoretical calculation of temperature variations. 展开更多
关键词 The modified propellants Dynamic loading mechanical property Damage-ignition mechanism experimental and theoretical calculation
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Crushing Mechanism of Spherical Tungsten Alloy Fragments Penetrate Thick Steel Plate Target
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作者 WAN Mingming BAI Rong +3 位作者 SHANG Zaifei WANG Yanli LIANG Jiayi LI Xue 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第2期445-450,共6页
Against protection requirements for high-speed fragments on the ground weapons,we carried out the research work of crushing mechanism at different impact speeds ofφ8.7 mm spherical tungsten alloy,the penetration to 6... Against protection requirements for high-speed fragments on the ground weapons,we carried out the research work of crushing mechanism at different impact speeds ofφ8.7 mm spherical tungsten alloy,the penetration to 603 armor steel was completed by 20 mm ballistic gun,and the ANSYS/LS-DYNA software was used to complete the numerical calculation of the penetration.We find that there are different crushing mechanisms of spherical tungsten alloy with different speeds and low speed,the crushing mechanism of fragment is mainly controlled by overall plastic deformation,shearing stripping,and squeezing at a high pressure and a high speed.The crushing mechanism will have a spallation phenomenon in addition to the crushing mechanism under high pressure. 展开更多
关键词 spherical tungsten alloy experimental research numerical simulation crushing mechanism high pressure affected zone spallation zone
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液氮冻结和冻融条件下煤体力学特性及裂隙演化教学实验设计 被引量:1
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作者 吴兵 黄来胜 +2 位作者 李杨 李超 雷柏伟 《实验技术与管理》 CAS 北大核心 2024年第3期210-216,共7页
该文设计了液氮冻结煤岩实验装置,并进行了液氮冻结和冻融条件下煤体力学特性实验,研究了液氮冻结时间和冻融次数对煤体力学强度及裂隙演化的影响规律,定量分析了液氮冷浸对煤体力学特征的影响。通过基于机理分析的实验教学拓展延伸,能... 该文设计了液氮冻结煤岩实验装置,并进行了液氮冻结和冻融条件下煤体力学特性实验,研究了液氮冻结时间和冻融次数对煤体力学强度及裂隙演化的影响规律,定量分析了液氮冷浸对煤体力学特征的影响。通过基于机理分析的实验教学拓展延伸,能够使学生从原理层面分析实验结果,学习宏微观结合的分析方法,加深对实验课程的理解,提高创新能力,开拓学术视野。 展开更多
关键词 液氮冻结 液氮冻融 力学特性 裂隙演化 实验教学
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底部双排配筋单孔空心预制梁力学性能试验研究
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作者 马少春 何星佑 +1 位作者 鲍鹏 闫超 《石河子大学学报(自然科学版)》 CAS 北大核心 2024年第4期457-463,共7页
为了研究新型装配式单孔空心预制梁的抗弯承载力和变形性能,并提高其工作性能。试验共设计并制作了3根单孔空心预制梁和1根实心预制梁,通过试验和理论计算相结合的分析手段,重点研究单孔空心预制梁和实心预制梁的破坏机理、裂缝发展、荷... 为了研究新型装配式单孔空心预制梁的抗弯承载力和变形性能,并提高其工作性能。试验共设计并制作了3根单孔空心预制梁和1根实心预制梁,通过试验和理论计算相结合的分析手段,重点研究单孔空心预制梁和实心预制梁的破坏机理、裂缝发展、荷载-挠度曲线、变形性能及抗弯承载力等。结果表明:单孔空心预制梁与普通实心预制梁的破坏特征相似,且其裂缝分布较均匀、间距小,延性好;在相同荷载作用下,单孔空心预制梁挠度大于实心预制梁,其整体受力变形性能相对优越。提出了截面有效面积等效法和混凝土轴心抗压强度等效法2种计算方法,通过对比分析发现,混凝土轴心抗压强度等效法计算值误差仅为0.82%,满足工程要求,而且单孔空心预制梁与实心梁相比还可节约材料8.72%。因此,单孔空心预制梁具有良好的应用前景。 展开更多
关键词 空心预制梁 试验研究 力学性能 荷载-挠度曲线 等效计算
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核电站堆腔混凝土辐照试验研究
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作者 黄岗 刘晓松 +7 位作者 李国云 许怡幸 陈浩 刘东彬 李延鹏 黄伟杰 张平 金帅 《原子能科学技术》 EI CAS CSCD 北大核心 2024年第8期1725-1731,共7页
作为核电站关键材料的堆腔混凝土,其安全服役是核电站长期稳定安全运行的前提条件之一。为了进行堆腔混凝土的中子辐照损伤机理研究,获得堆腔混凝土在中子辐照环境下的试验数据,本文建立了堆腔混凝土辐照试验方法,研制了辐照试验装置,... 作为核电站关键材料的堆腔混凝土,其安全服役是核电站长期稳定安全运行的前提条件之一。为了进行堆腔混凝土的中子辐照损伤机理研究,获得堆腔混凝土在中子辐照环境下的试验数据,本文建立了堆腔混凝土辐照试验方法,研制了辐照试验装置,并在研究堆中对其进行了加速辐照试验。结果表明:辐照试验装置设计合理,辐照试验指标满足试验要求,实现了两种规格多个混凝土试样的中子辐照。进一步的混凝土试样辐照性能研究结果表明:混凝土试样在平均快中子注量3.41×10^(18) cm^(−2)下辐照后,与辐照前相比,其外部形状未见明显差异,但试样颜色变化较大,并且出现一定的辐照肿胀和力学性能退化现象。 展开更多
关键词 核电站 堆腔混凝土 中子辐照 辐照性能 试验研究
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轨道交通锥型橡胶弹簧力学性能试验设计及研究
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作者 彭立群 林达文 +2 位作者 张志强 陈刚 王进 《特种橡胶制品》 CAS 2024年第4期55-59,共5页
针对轨道交通锥型橡胶弹簧刚度和疲劳试验,分析橡胶弹簧结构及试验标准,设计新型的橡胶弹簧垂向性能、横向性能和疲劳试验方案,研究疲劳次数对垂向刚度、压缩高、横向刚度的影响以及不同压缩载荷对不同橡胶层应变的影响。结果表明:试验... 针对轨道交通锥型橡胶弹簧刚度和疲劳试验,分析橡胶弹簧结构及试验标准,设计新型的橡胶弹簧垂向性能、横向性能和疲劳试验方案,研究疲劳次数对垂向刚度、压缩高、横向刚度的影响以及不同压缩载荷对不同橡胶层应变的影响。结果表明:试验设计满足试验要求,1000万次疲劳试验后,该结构橡胶弹簧垂向刚度减小2.5%、压缩高下降2.56%、横向刚度减小6.7%;垂向分别加载16 kN和28.5 kN工况下,橡胶弹簧第1层和第2层橡胶的应变值基本一致,达到等应变设计目的。 展开更多
关键词 轨道交通 橡胶弹簧 力学性能 试验研究
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