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基于热模拟试验获得超高强铝合金真应力-真应变数据的基础上,采用Prasad、murty、Gegel和Malas失稳准则分别构建不同真应变下的试验合金失稳图,并分析不同失稳准的失稳区域分布及演变特点。结果表明:所有判据下的失稳图中,高温高应变速率区域是失稳区高频出现区域;随着真应变增大,呈大面积离散状分布的Prasad失稳区域不断减小;呈离散状分布的murty判据下的失稳区域,在中高温和中应变速率区域产生新的失稳区域,区域范围呈增大趋势;随着真应变增大,Gegel和Malas判据下失稳区域分布及演变特点相似,低温低应变速率下的失稳区域均呈增大趋势,中高温高应变速率区域对应的失稳区域逐渐呈减小趋势。
Based on the real stress-strain data of ultra-high strength Al-alloy based on the thermal simulation test, the instability curves of the test alloy under different true strains were constructed by the Prasad, Murty, Gegel and Malas instability criterion, respectively. Unbalanced regional distribution and evolution characteristics. The results show that the region of high temperature and high strain rate is the high-frequency occurrence region of the unstable region under all the failure conditions. With the increase of true strain, the area of Prasad instability with large area and discrete distribution decreases continuously. Discontinuous murty criterion, the instability zone produces a new zone of instability at mid-high temperature and medium strain rate, and the range of zone shows an increasing trend. As the true strain increases, the instability of Gegel and Malas criterion The characteristics of regional distribution and evolution are similar. The instability regions at low temperature and low strain rate all show an increasing trend, and the corresponding instability regions at mid-high temperature and high strain rate gradually decrease.