检索结果-南通市图书馆

mechanical behavior and response mechanism of porous metal structures manufactured by laser powder bed fusion under compressive loading

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 737-749页

作者： Xuanming Cai Yang Hou Wei Zhang Zhiqiang Fan Yubo Gao Junyuan Wang Heyang Sun Zhujun Zhang Wenshu Yang School of Aerospace Engineering North University of ChinaTaiyuan 030051China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China School of Astronautics Harbin Institute of TechnologyHarbin 150080China School of mechanical Engineering North University of ChinaTaiyuan 030051China Shijiazhuang Campus Army Engineering University of PLAShijiazhuang 050003China 65589 Unit 91 Detachment Daqing 163411China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150080China

Al Si10Mg porous protective structure often produces different damage forms under compressive loading,and these damage modes affect its protective *** order to well meet the service requirements,there is an urgent need to comprehensively understand the mechanical behavior and response mechanism of AlSi10Mg porous structures under compressive *** this paper,Al Si10Mg porous structures with three kinds of volume fractions are designed and optimized to meet the requirements of high-impact,strong-energy absorption,and lightweight *** mechanical behaviors of AlSi10Mg porous structures,including the stress-strain relationship,structural bearing state,deformation and damage modes,and energy absorption characteristics,were obtained through experimental studies at different loading *** damage pattern of the damage section indicates that AlSi10Mg porous structures have both ductile and brittle mechanical *** simulation studies show that the AlSi10Mg porous structure undergoes shear damage due to relative misalignment along the diagonal cross-section,and the damage location is almost at 45°to the load direction,which is the most direct cause of its structural damage,revealing the damage mechanism of AlSi10Mg porous structures under the compressive *** normalized energy absorption model constructed in the paper well interprets the energy absorption state of Al Si10Mg porous structures and gives the sensitive location of the structures,and the results of this paper provide important references for peers in structural design and optimization.

关键词： AlSi10Mg additive manufacture energy absorption characteristics damage by deformation mechanical behavior

mechanical behavior of a shelter system based on cable-strut structures

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第12期13卷 895-903页

作者： Jian-guo CAI1,2,Ya ZHOU1,Jian FENG1,2,Yi-xiang XU3 (1Key Laboratory of C&PC Structures of Ministry of Education,Southeast University,Nanjing 210096,China) (2National Prestress Engineering Research Center,Southeast University,Nanjing 210096,China) (3Department of Civil Engineering,Strathclyde University,Glasgow,UK) 1. Key Laboratory of C&PC Structures of Ministry of Education Southeast University Nanjing 210096 China 2. National Prestress Engineering Research Center Southeast University Nanjing 210096 China 3. Department of Civil Engineering Strathclyde University Glasgow UK

A shelter system based on cable-strut structures,consisting of compressive struts and high-tensile elements,is described in this *** deployment of the shelter is achieved by tightening inclined *** cables are used to terminate the *** state of self-stress of the cable-strut structures in the fully deployed configuration is given,and the minimum strut length and the maximum load design of the shelter are *** mechanical behavior of the system was studied under symmetrical and asymmetrical load *** results show that the shelter in the deployed configuration satisfies the ultimate limit and the serviceability limit state ***,the stability of the cable-strut system is investigated,considering the effect of imperfections on the buckling of the *** conclude that the influence of imperfections based on the consistent imperfection mode method is not significant.

关键词： Foldable structures Cable-strut structures mechanical behavior Self-stress Stability

mechanical behavior of LC_4 alloy in semisolid state at high volume fractions of solid

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2001年第5期11卷 721-724页

作者：田文彤罗守靖张广安 Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The mechanical behavior of LC 4 alloy in the semisolid state at high volume fractions of solid has been studied through unconstrictive compressing test. The results show that peak stress mainly depends on grain boundary’s cohesion and instantaneous strain rate sensitivity in the semisolid state, which is similar to that in the solid state. Analyses on microstructures and status of compressive stress of specimen demonstrate that segregation of liquid solid phase is mainly affected by strain rate and deformation temperature. There are mainly two kinds of flow in liquid phase: either from the region with relatively large hydrostatic compressive stress to the region with relatively small hydrostatic compressive stress or from the grain boundaries perpendicular to the compression axis to the grain boundaries with a certain directional angle to the compression direction. Based on the above results, compressive deformation mechanism mainly depends on deformation temperature, strain rate and stress state.

关键词： LC 4 alloy semisolid mechanical behavior segregation of liquid solid phase

mechanical behavior of rock under uniaxial tension:Insights from energy storage and dissipation

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2466-2481页

作者： Guanshuang Tan Chunde Ma Junjie Zhang Wenyuan Yang Guiyin Zhang Zihao Kang School of Resources and Safety Engineering Central South UniversityChangsha410083China

Many rock engineering projects show that the growth of tensile cracks is often an important cause of engineering disasters,and the mechanical behavior of rocks is essentially the transmission,storage,dissipation and release of *** investigate the tensile behavior of rock from the perspective of energy,uniaxial tension tests(UTTs)and uniaxial compression tests(UCTs)were carried out on three typical rocks(granite,sandstone and marble).Different unloading points were set before the peak stress to separate elastic energy and dissipated *** input energy density ut,elastic energy density ue,and dissipated energy density ud at each unloading point were calculated by integrating stress-strain *** results show that there is a strong linear relationship between the three energy parameters and the square of the unloading stress in UCT,but this linear relationship is weaker in *** ue and ud increase linearly with the increase in ut in UCT and *** on the phenomenon that ue and ud increase linearly with ut,the applicability of W_(et)^(p) index in UTT was proved and the relative energy storage capacity and absolute energy distribution characteristics of three rocks in UCT and UTT were *** tensile behavior of marble and sandstone in UTT can be divided into two stages vaguely according to the energy distribution,but granite is not the *** addition,based on dissipated energy,the damage evolution of three types of rocks in UCT and UTT was *** study provides some new insights for understanding the tensile behavior of rock.

关键词： Uniaxial tension Energy density mechanical behavior Energy storage coefficient Energy dissipation coefficient

mechanical behavior and Failure Mechanism of Recycled Semi-flexible Pavement Material

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 981-988页

作者：丁庆军 ZHAO Mingyu SHEN Fan ZHANG Xiaoqiang State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology School of Materials Science and Engineering Wuhan Institute of Technology School of Transportation Wuhan University of Technology

The mechanical behavior and failure mechanism of recycled semi-flexible pavement material were investigated by different scales method. The macroscopic mechanical behavior of samples was studied by static and dynamic splitting tensile tests on mechanics testing system(MTS). The mechanical analysis in micro scale was carried out by material image analysis method and finite element analysis system. The strains of recycled semi-flexible pavement material on samples surface and in each phase materials were obtained. The test results reveal that the performance of recovered asphalt binder was the major determinant on the structural stability of recycled semi-flexible pavement material. The asphalt binder with high viscoelasticity could delay the initial cracking time and reduce the residual strain under cyclic loading conditions. The failure possibility order of each phase in recycled semi-flexible pavement material was asphalt binder, reclaimed aggregate, cement paste and virgin aggregate.

关键词： semi-flexible pavement RAP recycling technology failure mechanism mechanical behavior

mechanical behavior OF FCC CRYSTAL SIMULATED BY 3-D DISCRETE DISLOCATION DYNAMICS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2008年第2期21卷 94-102页

作者： Y.Yu X.X. Pan Y.H. Rong School of Materials Science and Engineering Shanghai Jiaotong University Shanghai 200030 China Institute of Structural Mechanics China Academy of Engineering Physics Mianyang 621900 ChinaManuscript received 31 May 2007

To simulate the mechanical behavior of the FCC crystal with the lower Peierls stress, the stiff property and physical meaning of the differential equation group consisting of dislocation evolution and mechanical state was investigated based on the 3-D discrete dislocation dynamics; the results indicate that the differential equation group is serious stiff, namely the external stress changes more quickly than dislocation evolution. Using the established numerical algorithm, the mechanical behavior of FCC crystal was simulated with the dislocations located in the parallel slip planes, and the effect of strain rate on the dislocation configuration and mechanical behavior, and the sat- uration process of mobile dislocation were discussed. The simulation results indicate that the numerical algorithm can efficiently simulate the dislocation dipole and the low strain rate loading.

关键词： FCC crystal mechanical behavior Dislocation dynamics Nu-merical simulation

mechanical behavior and Microstructure Characterization of 3D Stitched Quartz Fibers-reinforced Silica Composites

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2014年第1期29卷 5-8页

作者：轩立新 LIU Yong 陈照峰 College of Material Science & Technology Nanjing University of Aeronautics and Astronautics Aviation Key Laboratory of Science and Technology for High Performance Electromagnetic Windows

The mechanical properties of silica material in the monolithic form are ;far from acceptable levels. In this paper, 3D stitched quartz preform was used for the fiber reinforcement, and quartz fibers- reinforced silica composites were prepared by the silica sol-infiltration-sintering method. The density of the composite was up to 1.71 g/cm3 after 10 infiltration-sintering cycles. The flexural strength and the in-plane shear strength were 61.7 MPa and 20.3 MPa, respectively. The flexural stress-deflection curve exhibited mostly nonlinear behavior, which was different from that of monolithic ceramics. Because of the existence of the fiber in Z axis direction, shearing property between the different layers of 3D stitched composites were greatly enhanced. Toughness effect of the 3D stitched quartz preform was conspicuous. The as-fabricated composites showed non-catastronhic failure behavior resulting from weak fiber/matrix interface.

关键词： 3D stitched preform ceramic matrix composites microstructure mechanical behavior

Modification of Mn on corrosion and mechanical behavior of biodegradable Mg(88)Y4Zn2Li5 alloy with long-period stacking ordered structure

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第7期42卷 130-142页

作者： Jiaxin Zhang Jinshan Zhang Fuyin Han Wei Liu Longlong Zhang Rui Zhao Chunxiang Xu Jing Dou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan030024China

The biological corrosion behavior and mechanical properties of Mg(89-x)Y4 Zn2 Li5 Mnx(x=0,0.5,1,1.5 and2 at.%) alloy with long-period stacking ordered(LPSO) structure were investigated in this *** magnesium matrix and the eutectic phase of Mg(88)Y4 Zn2 Li5 Mn1 alloy are effectively refined by the grain boundary segregation of Mn,and the average size of matrix and the eutectic phase decreased by 66%and 74%,*** ultimate tensile strength(UTS) and elongation enhanced by 36% and 55%,*** corrosion rates obtained by weight loss and hydrogen evolution of Mg(88)Y4 Zn2 Li5 Mn1 alloy were 79% and 84% lower than that of Mg(88)Y4 Zn2 Li5 ***,Mg(88)Y4 Zn2 Li5 Mn1 alloy also presents superior corrosion behavior in electrochemical *** is verified that Mn plays a positive role in both corrosion and mechanical properties of the Mg(88)Y4 Zn2 Li5 Mn1 alloy,which provides a reference for further experimental work.

关键词： Magnesium alloy LPSO Corrosion mechanical behavior EIS

Sea Urchin Spines as a Model-System for Permeable,Light-Weight Ceramics with Graceful Failure behavior. Part I. mechanical behavior of Sea Urchin Spines under Compression

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2009年第4期6卷 203-213页

作者： V.Presser S.SchultheiB C.Berthold K.GNickel Institute

The spines of pencil and lance urchins Heterocentrotus mammillatus and Phyllacanthus imperialis were studied as a model of light-weight material with high impact *** complex and variable skeleton construction ('stereom') of body and spines of sea urchins consists of highly porous Mg-bearing calcium *** basically brittle material with pronounced single-crystal cleavage does not fracture by spontaneous catastrophic device failure but by graceful failure over the range of tens of millimeter of bulk compression *** was observed in bulk compression tests and blunt indentation experiments on regular,infiltrated and latex coated sea urchin spine *** characterization was carried out using X-ray computer tomography,optical and scanning electron *** behavior is interpreted to result from the hierarchic structure of sea urchin spines from the rnacroscale down to the *** derived from this study see ceramics with layered porosity as a possible biomimetic construction for appropriate applications.

关键词： sea urchin urchin spines biominmitic mechanical behavior compression calcite

同方期刊数据库