(中国工程物理研究院 总体工程研究所，绵阳 621900)
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。
关键字: 流动应力；端面摩擦；缺口圆柱试件；能量守恒；迭代修正
（Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, China）
Abstract:The influence of interfacial friction on the compressive deformation behavior of metals (especially ductile metals) was eliminated by design of axisymmetric notched cylindrical specimen. Based on the energy conservation between external work and internal energy of specimen in compression test, an approximate correction formula of compression flow stress was derived and the corresponding iterative correction procedure was proposed. For aluminum alloy 2024, both the diameter of minimum cross-section and the internal energy of specimen in compression process were predicted by the corrected flow stress-strain relationships and compared with the experimental results. The results show that the predicted diameters of minimum cross-section are agree with the experimental data and the internal energy of specimen is always consistent with the experimental external work in the whole compression process, which verify the effectiveness of the correction method.
Key words: flow stress; interfacial friction; notched cylindrical specimen; energy conservation; iterative correction
