基于Hopkinson压杆的动态压剪复合加载实验研究

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基金项目: 中央高校基本科研业务费专项资金资助

A study of dynamic combined compression-shear loading technique based on hopkinson pressure bar

CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China

摘要: 提出了一种可用于研究压剪复合加载下, 材料动态力学性能的实验装置, 该装置基于Hopkinson压杆, 通过添加一个带倾斜端面的垫块, 实现压剪复合加载.分析了该实验装置的基本数据处理方法, 并利用有限元分析验证了此分析方法的可行性;然后利用该装置对常规金属材料进行了相同冲击速度, 不同倾斜角度(0$^\circ$,30$^\circ$, 45$^\circ$)下的一系列实验. 实验结果表明, 该装置能实现压剪复合加载, 并且能得到材料的动态屈服面, 为研究材料在复杂应力状态下的动态力学性能提供了新的实验方法.
- 动态屈服面
Abstract: This paper presents a new combined compression-shear testtechnique based on Hopkinson pressure bar to investigate the dynamicresponse of materials. The desired compression-shear loading were applied bythe beveled ends with different angles. The data processing methods arestudied and verified by the finite element analysis. A series of experimentson common metal were performed at the same impact velocity with the loadingangles ranging from 0$^{\circ}$ to 60$^{\circ}$. It shows that this method canprovide combined compression-shear loading, and achieve a new experimentalmethod to investigate the dynamic mechanical properties of materials underimpact multiaxial loadings.
- dynamic yield surface