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摘要：
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为了建立镁合金板温拉深成形的流变应力数学模型,在温度为200℃~350℃和应变速率为0.001 s-1~0.1s-1的条件下,对AZ31镁合金板进行拉伸实验,研究其温拉深流变应力行为。通过对Fields-Backofen方程修正分析,建立了AZ31镁合金板温拉深流变应力数学模型,在峰值应力之前,模型预测值与实测结果相比十分接近。对加入软化因子s的模型进行了计算,与修正的Fields-Backofen相比,更好的模拟了软化阶段的流变应力变化。本文研究的模型可以用于指导镁合金板成形,也为有限元分析流变应力打下基础。
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For modeling the flow stress of Magnesium alloy sheet during warm forming,warm tensile test with magnesium alloy AZ31 are carried out in a temperature range of 200℃～350℃,strain rate range of 0.001s~(-1)～0.1s~(-1),flow stress behavior of AZ31 magnesium alloy sheet during warm tensile is studied in this paper.The mathematic model about the flow stress of AZ31 magnesium alloy sheet during tensile test is developed by modifying and analyzing Fields-Backofen equation,the flow stresses calculated by the present formula give a good fit to the measured ones before the peak value of the flow stress.The mathematical model which contains a softening item s is calculated here,compared to the new Fields-Backofen model,this model approaches more closely at the soften state of the flow stress.The mathematic models studied in this paper can be used to guiding the forming of magnesium alloy sheet, and prepare a foundation of finite element analysis of flow stress.
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基金项目：
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湖南省重大专项计划项目(04GK1008-1)
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作者简介：
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参考文献：
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[1]Fredrich H,Schumann S.Research for a“new age of magne-sium”in the automotive industry[J].Journal of MaterialsProcessing Technology,2001,117(3):276 281.
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[3]张先宏,崔振山,阮雪榆.镁合金塑性成形技术———AZ31B成形性能及流变应力[J].上海交通大学学报,2003,37(12),1874 1877.
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[6]张先宏.镁合金热变形过程试验研究和数值模拟[D].上海:上海交通大学,2003.
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