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摘要：
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弹性模量是影响冲压回弹量的重要材料性能参数,在工程应用和回弹数值模拟中一般认为弹性模量为常数。而实际上,弹性模量随塑性变形的增大不断变化,因此其变化对工程中的回弹量评估和数值模拟回弹预测精度有很大的影响。本文针对在汽车和航空工业中广泛应用的铝合金和钢板,采用动力试验方法,对ST14钢及3A21、2024-T3和2A12铝合金的弹性模量在塑性变形中的变化规律进行了试验研究,得到了弹性模量值与等效塑性应变的变化规律,并采用分段线性函数进行了描述。研究结果为进一步研究弹性模量随塑性变形的变化规律及探讨其本质提供了依据,也预示了一种提高有限元回弹预测精度的解决办法。
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Young's modulus is an important material property parameter which affects springback of stamping.In the engineering application and springback simulation,Young's modulus is considered as constant.But actually Young's modulus continually changes as plastic deformation increases.Therefore,it makes great effect on the springback evaluation of engineering and accuracy of springback prediction.Dynamic experimental method was applied to explore the variation law of Young's modulus and plastic deformation.Experimental research was carried out on 2024 aluminum alloy,2A12 aluminum alloy,3A21 aluminum alloy and ST14 steel.Then the variation law of Young's modulus and equivalent plastic strain was obtained,and piecewise linear function was used to describe the variation law.Research result supplies basis for deeply studying on the variation law of Young's modulus and plastic deformation,and also indicates a method to improve the accuracy of springback prediction.
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基金项目：
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十一五国家科技支撑计划资助项目(2006BAFO4B14);;
塑性成形模拟及模具技术国家重点实验室开放基金资助项目(06-13)
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作者简介：
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参考文献：
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