剪切应变

In this paper, the dynamic compressing experiments for the matrix material of the tungsten alloys which have been three different deforming(0%、 32.6%、 44.6%) processed have been performed by the experimental technology of separated Hopkinson pressure bar and many accurate datum have been obtained. Also the three materials have been compared with each other and analyzed. The results show that the optimized values are in a certain range to optimize the materials by changing their deforming technology. The parameters of constitutive model of Johnson-Cook have been fitted based on the datum. Then proceed to the next step, adiabatic shear band of these three matrix materials has been analyzed with finite element method. The result shows that the relations between stress and strain are different because of the differences of technical process of the three materials, but they are in great commonness in the material experiment and in great coherence in the distribution of time and space, which can been seen from the space distributing figures of plastic strain.

利用分离式Hopkinson压杆实验技术对三种不同变形量(0%、32.6%、44.6%)钨合金基体材料进行动态压缩实验，取得大量精确的数据，对比分析三种材料，结果表明通过改变变形量对材料进行优化，其变形量的优化值是有一定范围的；本论文拟合、确定了钨合金基体材料Johnson-Cook本构模型参数并对三种基体材料绝热剪切带进行有限元分析，结果表明三种材料由于工艺流程的不同，应力应变关系也不尽相同，但从塑性应变的空间分布图上体现了材料很大的共性和时间以及空间分布的一致性。

Based on the above results, plane strain deformation is considered to be a necessary condition of shear banding.

基于对以上研究结果的讨论，本文认为，剪切带是在平面应变变形条件下当应变硬化率降到很低时发生的。

Taking account of the characteristics of pure shear and plane strain, after the measurement to fish-head bodin s'present shapes and the resume of their original shapes, with several reasonable and ideal presumes, the author put forward the refraction rheology gauge of fish-head boudin.

认识到鱼嘴构造的纯剪切作用机制及其平面应变的特点，通过对香肠现有的几何参数的测量和计算以及对香肠构造演化初始阶段几何参数的恢复，在合理假设的理想状况下，推导出鱼嘴构造的应变差折射流变计。

The ductile shear zone played an important role in localization of gold ore deposits:(1) The ductile shear zone confines the source, migration and evolution of ore forming fluid ;(2) Shear stress and deformation accelerate the remobilization of min.

田湾矿田剪切带制约着成矿流体的来源、运移和演化，剪切应力、应变作用对成矿元素的活化迁移具有重要的影响，为金的成矿提供了物质基础和创造了条

The ductile shear zone played an important role in localization of gold ore deposits:(1) The ductile shear zone confines the source, migration and evolution of ore-formingfluid;(2) Shear stress and deformation accelerate the remobilization of mineralized elements;(3) The ductile shear zone supplies space for ore-forming fluid deposition.

田湾矿田剪切带制约着成矿流体的来源、运移和演化，剪切应力、应变作用对成矿元素的活化迁移具有重要的影响，为金的成矿提供了物质基础和创造了条件。

The ductile shear zone played an important role in localization of gold ore deposits:(1) The ductile shear zone confines the source, migration and evolution of ore-forming fluid;(2) Shear stress and deformation accelerate the remobilization of mineralized elements;(3) The ductile shear zone supplies space for ore-forming fluid deposition.

田湾矿田剪切带制约着成矿流体的来源、运移和演化，剪切应力、应变作用对成矿元素的活化迁移具有重要的影响，为金的成矿提供了物质基础和创造了条件。

The shaping course of Fine blanking is very complex. Material forms a local plastic cutting area between punch and bottom die, and brings violent plastic flow under the effect of press stress. The grad of stress and strain is great, and it is an unstable transmutation process that came through an elastic distortion, plastic distortion and cut rupture.

精冲成形过程非常复杂，材料在狭窄的凸、凹模间隙附近形成了局部塑性剪切带，在压应力的作用下产生强烈的塑性流动，应力应变梯度很大，是一个经历弹性变形、塑性变形和剪切断裂的非稳态大变形过程。

Test results have shown that larger plastic volumetric strain as well as higher growth rate of pore water pressure would be generated in multi-directional shearing than in a single-directional one. Lower resistance of sand to liquefaction was also observed under the rotation of principal stress orientation.

与单向剪切相比，多向剪切会产生额外的塑性体积应变，在不排水条件下孔隙水压力增长的速率较高，特别是在具有主应力轴连续旋转特点的加载条件下，砂土抵抗液化的能力也将更低。

It has been observed that a general strain fail criterion for clay is recommended for considering the integrative effects of torsional shear strain and normal deviatoric strain as well as cyclic strain and accumulative strain.

提出的综合应变式同时考虑了剪切变化和正向偏差变形的共同效应，适合作为主应力连续旋转的耦合循环剪切试验的破坏标准。

A stress-strain diagram can be plotted using shear stress and shear strain.

应力-应变图可以用来表现剪切应力与剪切变形。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。