双轴加载条件下5083铝合金应力松弛提高塑性的试验研究

IF 1.9 Q3 ENGINEERING, MANUFACTURING

Manufacturing Letters Pub Date : 2024-12-12 DOI:10.1016/j.mfglet.2024.11.007

Vikram Balaji , Rubal Dongarwar , Hariharan Krishnaswamy , Sushil Mishra

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引用次数: 0

摘要

应力松弛对金属材料延性改善的影响已经得到了广泛的研究，主要是通过中断的单轴拉伸试验。然而，在典型的冲压成形过程中，零件受到多轴应力状态的影响。施加的载荷路径对松弛后的破坏应变有影响，这在单轴载荷下是不可行的。因此，在铝合金十字形试样中，通过中断平面双轴拉伸试验进行单松弛试验。试验在不同的荷载比下进行，以评估应力松弛的荷载路径依赖性，否则被忽视。

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Experimental investigations on the ductility improvement due to stress relaxation in aluminium alloy 5083 under biaxial loading conditions

The influence of stress relaxation on ductility improvement has been extensively studied for metallic materials, primarily through interrupted uniaxial tensile tests. However, components in typical press forming processes are subjected to multiaxial states of stresses. The applied load paths are expected to have a bearing on the failure strain post relaxation, which is infeasible to study under uniaxial loading. Therefore, single relaxation tests are carried out through interrupted planar biaxial tensile tests in cruciform samples of an aluminum alloy. The tests are performed at different load ratios to assess the load path dependency of stress relaxation, which is otherwise neglected.

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