| 7075铝板弹性模量退化行为研究及回弹预测 |
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| 引用本文： | 杨卓云,樊博成,李萧逸,张子路,董国疆.7075铝板弹性模量退化行为研究及回弹预测[J].中国机械工程,2022,33(18):2241-2248. |
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| 作者姓名： | 杨卓云 樊博成 李萧逸 张子路 董国疆 |
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| 作者单位： | 1.燕山大学先进锻压成形技术与科学教育部重点实验室，秦皇岛，066004
2.燕山大学河北省特种运载装备重点实验室，秦皇岛，066004
3.东北大学机械工程与自动化学院，沈阳，110819 |
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| 基金项目： | 国家自然科学基金(51775481)；河北省自然科学基金(E2019203418) |
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| 摘 要： | 金属板材的弹性模量随塑性变形发生衰退，这一现象对板材成形中的回弹预测影响巨大。为研究7075高强铝板的弹性模量衰退规律，采用传统的循环加载试验进行弹性模量测试，同时借助DIC应变测量系统设计弯曲卸载试验进行测试。试验结果表明：弹性模量随塑性变形发生明显退化且衰退规律受材料变形所处的应力状态影响。将两种试验所得衰退规律用于C形梁成形过程中的有限元回弹仿真，仿真与试验的对比结果表明：弯曲卸载试验所得弹性模量衰退规律对C形梁回弹分析的结果明显优于循环加载试验所得规律的结果，四个回弹角的预测精度分别提高了42%、7%、40%和200%。
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| 关 键 词： | 回弹 变弹性模量 铝合金板材 UMAT子程序 |
Recession of Elastic Modulus and Prediction of Springback for 7075 Aluminum Alloy Sheets |
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| YANG Zhuoyun,FAN Bocheng,LI Xiaoyi,ZHANG Zilu,DONG Guojiang.Recession of Elastic Modulus and Prediction of Springback for 7075 Aluminum Alloy Sheets[J].China Mechanical Engineering,2022,33(18):2241-2248. |
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| Authors: | YANG Zhuoyun FAN Bocheng LI Xiaoyi ZHANG Zilu DONG Guojiang |
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| Affiliation: | 1.Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education,Yanshan University,Qinhuangdao,Hebei，066004
2.Hebei Key Laboratory of Special Delivery Equipment,Yanshan University,Qinhuangdao,Hebei，066004
3.School of Mechanical Engineering and Automation,Northeastern University,Shenyang,110819 |
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| Abstract: | The recession of elastic modulus happening in the plastic deformation of sheet metals had a big influence on the springback prediction in sheet metal forming processes. To study the recession law of elastic modulus for 7075 aluminum alloy sheets, the conventional cyclic loading experiments were used and a new bending-unloading experiment with the assistance of DIC strain measuring system was designed to test the elastic modulus. The testing results show that the elastic modulus has a significant decline with the growth of plastic deformations and the recession law of elastic modulus is influenced by the stress states during deformation. The recession laws obtained by two experiments were applied to the springback simulation of forming processes for a beam with shape C. The comparison between the results of simulations and experiments shows that the analysis results of springback from the recession law of cyclic loading experiments are better than that from the bending-unloading experiments. The prediction accuracy of the four springback angles is increased by 42%,7%,40% and 200% separately. |
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| Keywords: | springback changing elastic modulus aluminum alloy sheet UMAT subroutine |
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