磁驱动压-剪联合加载下材料动态强度的直接测量

发布时间：2018-01-01 02:36

本文关键词：磁驱动压-剪联合加载下材料动态强度的直接测量　出处：《中国科学:物理学力学天文学》2016年11期 　论文类型：期刊论文

【摘要】：动高压下材料的屈服强度测量一直是冲击动力学界长期追求的目标.本文介绍了一种直接测量材料高压强度的新实验方法,即磁驱动压-剪联合加载实验技术.分析了压-剪联合作用下材料的应力偏量与屈服强度关系,数值计算了斜波加载下压-剪联合作用时应力偏量与屈服强度的时空演化,给出了强度数值的计算方法.基于CQ-4装置,开展了磁驱动斜波加载压-剪联合实验设计并对铝的高压强度进行了测量,获得了可靠的实验数据.实验结果表明,磁驱动压-剪联合加载技术作为一种全新的加载手段,在材料的动高压强度测量方面展示了广阔的应用前景.
[Abstract]:The measurement of the yield strength of materials under dynamic high pressure has been a long-sought goal in the field of impact dynamics. A new experimental method for directly measuring the strength of materials at high pressure is introduced in this paper. The relationship between stress deviation and yield strength of the material under the combined pressure and shear loading is analyzed. The time-space evolution of stress deflection and yield strength under the combined pressure-shear action of oblique wave loading is numerically calculated, and the calculation method of strength value is given. The method is based on CQ-4 device. The experimental design of magnetically driven oblique wave loading pressure-shear test is carried out, and the high pressure strength of aluminum is measured, and reliable experimental data are obtained. The experimental results show that. As a new loading method, the magnetically driven pressure-shear combined loading technique has shown a broad application prospect in measuring the dynamic high pressure strength of materials.
【作者单位】：中国工程物理研究院流体物理研究所;
【基金】：国家自然科学基金项目(编号:11272295,11502252);国家自然科学基金委重大科研仪器设备专项(编号:11327803) 中国工程物理研究院流体物理研究所发展基金(编号:SFZ201401(04)03)资助项目
【分类号】：O346
【正文快照】： 物体微元的应力张量描述可分解为球量部分和偏量部分,前者对应材料的可压缩性(状态方程),后者对应材料的剪切强度(本构方程).在武器物理研究中,材料的强度一直是影响高压高应变率加载下材料动力学行为的重要因素之一,在某些情况下,甚至可能是影响实验成败的关键,如惯性约束聚

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