出版社:四川大学出版社
出版日期:2012-11
ISBN:9787561462348
页数:208页
章节摘录
版权页： 插图： In reality, a structure will evolve with strain under the influence of strain rate and temperature,and the evolution process is a balancing result of two competing processes—dislocation accumulation and dynamic recovery. The evolution which reflects the deformation history can be described by the strain hardening rate, θ=dσ/ dε=θ（ε,ε,T;σ）.The structural parameter MTS can be determined if the evolution law of the strain hardening rate is known. （ⅰ） Model for FCC metal. Gao and Zhang proposed a quasi—power—type law, instead of the linear Voce law, in the relations of θ～ε and θ～σ. By combining the two relations and using the equation describing the saturated value of MTS for fcc metals, they obtained the thermal component of MTS. On the other hand, the athermal stress of fcc metals includes an initial yield stress reflecting the influence of solute and initial defects, and a size—effect stress reflecting the influence of grain boundaries （GBs） in polycrystals （which is limited for conventional course—grained materials but quite obvious for nanocrystalline materials）. The grain size effect obeys the Hall—Petch （HP） relationship and can be regarded as constant if there are no physical changes to alter the average grain size during plastic deformation. After the MTS was determined together with the thermal activation function, the constitutive model for fcc metals was established. （ⅱ） Model for BCC metal. There exists an important difference between bcc and fcc metals in their thermally—activated dislocation mechanisms due to their different crystalline structures.The thermal activation area is closely related with strain for fcc metals but not for bcc metals.In other words, the strain hardening of bcc metals is not coupled in the thermal stress but belongs to the athermal stress. The athermal stress of bcc metals can be empirically determined by using power—law strain hardening. On the other hand, since the thermal stress of bcc metals is independent of straining, the saturated value of the thermal component of MTS should be the same as itself, i.e., σth =σth,s. As the saturation equation for fcc metals can be applied to bcc metals too, the thermal component of MTS for bcc metals can then be determined.
书籍目录
CHARACTERISTICS ANALYSES OF NONLINEAR VISCO—ELASTIC SPHERICAL WAVES Li—li Wang, Hua—wei Lai Zhan—jiang Wang and Li—ming Yang AN ELASTOPLASTIC CONSTITUTIVE MODEL OF POROUS MATERIALS Z. P Huang and Y. Q. Chen NANOPARTICLE MODIFICATION ON MECHANICAL PROPERTIES OF EPOXY RESIN Hong—Yuan Liu, Gongtao Wang and Yiu—Wing Mai EXPERIMENTAL AND NUMERICAL STUDY ON METAL RING SYSTEMS SUBJECTED TO IMPACT LOADING S. Wang, Y.Chen, K. Liu, G. Lu EFFECT OF DEFORMATION—INDUCED REORIENTATION ON PLASTIC BEHAVIOR IN A STRETCHED SHEET OF NEMATIC ELASTOMER Zhen Wu and Zheng Zhong COUPLED FLEXURAL—TORSIONAL VIBRATION OF DELAMINATED BEAMS SUBJECTED TO AXIAL LOADS AND STATIC END MOMENTS Y. Liu, D. W. Shu 石墨烯折叠力学的研究 Y.P Zhao, X.Y. Zhu and Q.Z. Yuan INSTABILITY OF GRAPHITE UNDER HIGH PRESSURE Chunzhang Zhu, Wanlin Guo and T.X. Yu EXPERIMENTAL INVESTIGATION OF RADIAL DYNAMIC RESPONSE OF TINI THIN—WALLED TUBES Zhiping Tang and Huijie Zhang NON—AXISYMMETRIC BEHAVIOR OF POST—BUCKLING FOR CYLINDRICAL SHELLS UNDER THERMAL IMPACT Xin—Sheng Xu, Chang—Yu Yang and C W. Lim WAVE PROPAGATION IN CELLULAR MATERIALS UNDER IMPACT LOADING Zhijun Zheng, Jilin Yu, Shenfei Liao and Changfeng Wang COMPRESSIVE RESPONSE OF CELLULAR MATERIALS THROUGH PARAMETER MANIPULATION OF DIFFERENT MODELS H.S. U. Butt and P.Xue A FURTHER STUDY ON THE ENERGY ABSORPTION CAPABILITY OF THIN WALL TUBES UNDER AXIAL CRUSHING M. Wang, L.M. Yang and T.X. Yu PENETRATION ANALYSIS AND OPTIMIZATION OF A DUAL WARHEAD SYSTEM Heming Wen and Xiaojun Guo MECHANICAL RESPONSE OF SANDWICH PANELS UNDER FOAM PROJECTILE IMPACT Mohd A. Yahaya, Dong Ruan and Guoxing Lu DISLOCATION—BASED CONSTITUTIVE DESCRIPTIONS OF DYNAMIC PLASTICITY OF FCC,BCC AND HCP METALS: AN OVERVIEW C. Y. Gao and L. C. Zhang A SIMPLE MODEL OF METAMATERIALS WITH NEGATIVE MASS AND MODULUS Xiaodong Wang SYNERGY EFFECT OF CF AND SMALL—SIZED INORGANIC FILLERS ON THE WEAR RESISTANCE OF PEEK COMPOSITES UNDER WATER LUBRICATED CONDITION Guo—Xin Sui, Guang—You Xie, Ying—Jie Zhong and Rui Yang MECHANICAL STRENGTH OF POLY（ETHYLENE—CO—VINYL ALCOHOL）NANOFIBRE SHEETS UNDER TENSILE LOADING Chao Xu, Bin Wang A NEW PLASTICITY THEORY OF SOLIDS BASED ON THE RUGGED FREE ENERGY LANDSCAPE H.H. Ruan and L. C. Zhang INVESTIGATION OF DYNAMIC BEHAVIOR OF SANDWICH TUBES WITH METALLIC FOAM CORES COMPRESSED BY TWO PLATENS Zhihua Fan, Jianhu Shen, Guoxing Lu and Dong Ruan NUMERICAL ANALYSIS OF ENERGY ABSORPTION BY USING DENSITY GRADIENT ALUMINIUM FOAM Jingde Li Guowei Ma and Xiuli Du DYNAMIC PROPERTIES OF CELLULAR METALS—NUMERICAL SIMULATIONS AND THEORETICAL ANALYSIS L.L. Hu and T.X. Yu SINGLE OR MULTIPLE ADIABATIC SHEAR BAND FORMATIONS IN JOHNSON—COOK MATERIALS Guihua Li Zhong Duan and Fenghua Zhou STUDY OF STEEL FIBER REINFORCED CONCRETE SLAB SUBJECTED TO DETONATION LOADING Xinlong Dong, Zhiquan Hong, Peizheng Gao, Jiangying Chen, Shiming Shao and Lili Wang NEW TECHNOLOGY OF FABRIC SENSORS FOR IMPACT MEASUREMENT IN LARGELY—DEFORMED COMPONENTS Xiaoming Tao, Bo Zhu, Qiao LL Weijing Yi, Junpu Wang and Xiaojian Wen AUTHOR INDEX
编辑推荐
《塑性力学与冲击动力学进展(ISPI2011国际会议论文集)(英文)》由四川大学出版社出版。
作者简介
《塑性力学与冲击动力学进展(ISPI2011国际会议论文集)(英文)》内容简介：This book contains 26 top—quality papers that were presented at the Third International Symposium on Plasticity and Impact （ISPI 2011） held in Hong Kong and Nansha, China on 8—12 December 2011. It reports on recent developments in the field of plasticity and impact engineering research from both the fundamental science and industrial application perspectives. The ISPI 2011 was dedicated to commemorate Professor Tongxi Yu’s 70th birthday and his recent retirement from the Hong Kong University of Science and Technology.It was specifically aimed at bringing together colleagues, friends and former graduate students of Professor Yu to discuss and exchange information on recent developments in plasticity and impact engineering, and to present their latest findings.