基于能量守恒原理的金属压缩流动应力修正方法

发布时间：2018-10-29 13:01

【摘要】：通过轴对称缺口圆柱试件设计,消除了端面摩擦对金属(特别是延性金属)试件压缩变形行为的影响。基于压缩过程中外力功与试件内能之间的能量守恒原理,推导了压缩流动应力的近似修正公式,并给出了相应的迭代修正过程。针对铝合金2024,利用修正后的流动应力-应变关系对压缩过程中试件的最小横截面直径和内能进行了预测,并与实验结果进行了比较。研究结果表明:在整个压缩过程中,试件的最小横截面直径的预测值与实验值吻合,且试件内能与实验外力功始终保持一致,从而验证了该修正方法的有效性。
[Abstract]:Through the design of axisymmetric notched cylindrical specimens, the effect of end friction on the compression deformation behavior of metal (especially ductile metal) specimens is eliminated. Based on the energy conservation principle between the external force and the internal energy of the specimen during compression, the approximate correction formula of compressive flow stress is derived, and the corresponding iterative correction process is given. Based on the modified flow stress-strain relationship, the minimum cross-section diameter and internal energy of the specimens in the compression process were predicted and compared with the experimental results. The results show that the predicted values of the minimum cross-section diameter of the specimen are consistent with the experimental values during the whole compression process, and the internal energy of the specimen is consistent with the external work of the experiment all the time, which verifies the validity of the modified method.
【作者单位】：中国工程物理研究院总体工程研究所;
【基金】：国家自然科学基金资助项目(11472257) 中国工程物理研究院总体工程研究所创新与发展基金资助项目(13CXJ09)~~
【分类号】：TG146.21

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