A Measurement of Bauschinger Effect of Thin Sheets Based on Reverse Simple Shear Deformation and Digital Speckle Correlation
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摘要: 采用简单剪切试验装置和三维数字散斑应变测量分析系统, 对SPCC冷轧钢板和AA6061铝板两种材料进行了简单剪切试验, 对其包申格效应进行了测试。结果表明: 简单剪切试验能够较为容易地实现反向加载, 且能得到较大变形时的力学特性, 同时散斑应变测量方法由于能够获得试样表面的整体应变场, 保证了剪应变测量的准确性; 两种材料在不同的预应变下, 正向加载阶段剪应力-剪应变关系曲线重合性较好; 且随预应变的增加, 反向屈服应力增加; 通过比较等向强化模型预测结果和试验测试结果, 显示两种材料均存在明显包申格效应、瞬态效应, 而SPCC钢板表现的更为明显永久软化效应。Abstract: Simple shear tests for the SPCC (steel plate cold-rolled commercial) and AA6061 aluminium alloy sheets were performed with a three dimensional digital speckle correlation strain measuring system, and the Bauschinger effect under strain path reversal condition was tested. The results show that it is easy to achieve reverse loading and obtain the mechanical properties at large deformation by simple shear deformation. The digital speckle correlation is a good method to capture the whole strain field, and makes sure that the measurement of shear strain is exact. The shear stress versus shear strain curves for both materials at different pre-strains show a good agreement. Reversed yield stress increases with the increase of pre-strain. By comparing the experimental and predicted results, the evident Bauschinger effect and transient effect exist for both materials, while the SPCC steel shows rather obvious permanent softening effect.
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Keywords:
- thin metal sheet /
- Bauschinger effect /
- simple shear /
- digital speckle correlation
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