高应变速率下 AA6014 铝合金的力学性能

Mechanical properties of AA6014 aluminum alloy with high strain rate

研究了高应变速率下不同应变速率对AA6014-T4铝合金板材力学性能的影响。针对1.0 mm厚的AA6014-T4铝合金板材,采用Hopkinson拉杆试验装置进行了不同高应变速率下的动态拉伸试验,获得了745~4500 s^(-1)范围内AA6014-T4铝合金板材的应力-应变数据,并对试验结果进行了对比分析。结果表明,当应变速率为745 s^(-1)时,AA6014-T4铝合金产生塑性变形但试样未断裂;当应变速率为4500 s^(-1)时,抗拉强度为238.45 MPa,塑性应变为0.467,高应变速率下的断裂应变明显大于准静态下的断裂应变。与准静态相比,高应变速率下的AA6014-T4铝合金板材具有一定应变强化效应。在高应变速率条件下,随应变速率的增加,铝合金板材的应变塑性效应得到明显强化。基于高应变速率条件下不同应变速率对AA6014-T4铝合金板材力学性能的影响试验研究和分析,得到了高应变速率对铝合金板材力学性能的影响规律。

The effects of different strain rates on the mechanical properties of AA6014-T4 aluminum alloy sheet with high strain rates were studied.The dynamic tensile test with different high strain rates of AA6014-T4 aluminum alloy sheet with thickness of 1.0 mm was carried out by Hopkinson tie bar test device,the stress-strain data of AA6014-T4 aluminum alloy sheet in the range of 745-4500 s^(-1) was obtained,and the test results were compared and analyzed.The result show that when the strain rate is 745 s^(-1),the AA6014-T4 aluminum alloy has plastic deformation without fracture;when the strain rate is 4500 s^(-1),the tensile strength is 238.45 MPa and the plastic strain is 0.467.The fracture strain with high strain rate is significantly higher than that at quasi-static state.Compared with the quasi-static state,the AA6014-T4 aluminum alloy sheet with high strain rate has a certain strain strengthening effect.Under the condition of high strain rate,the strain plastic effect of aluminum alloy sheet is strengthened obviously with the increase of strain rate.Based on the test study and analysis of the effect of different strain rates on the mechanical properties of AA6014-T4 aluminum alloy sheet under the condition of high strain rate,the influence law of high strain rate on the mechanical properties of aluminum alloy sheet was obtained.