锻压技术

基于摩擦与温升修正的Cu-Sn合金本构模型

英文标题：Constitutive model of Cu-Sn alloy based on friction and temperature rise correction

作者：鱼祎雯蔡军李冲冲李清阳李洋强凤鸣

分类号：TG146.1+1

出版年,卷(期):页码：2024,49(11):182-188

摘要：

采用Gleeble-3800热模拟试验机对Cu-Sn合金在变形温度为823~973 K、应变速率为0.001~10 s-1的条件下进行了热压缩试验。考虑到摩擦引起的鼓肚现象及摩擦热与变形热的影响，对试验结果进行修正，并建立材料的修正Johnson-Cook本构模型。结果表明：Cu-Sn合金的流动应力对应变速率和变形温度敏感；应力-应变曲线呈现动态再结晶型曲线特征。对修正Johnson-Cook本构模型的准确性进行了验证，发现修正Johnson-Cook本构模型计算得到的预测值与试验值的相关系数R为0.9848，平均相对误差AARE为7.936%，表明所构建的模型能较为精确地预测出Cu-Sn合金流动应力的变化。

The hot compression tests for Cu-Sn alloy in the condition of the deformation temperature of 823-973 K and the strain rate of 0.001-10 s-1 were carried out by thermal simulation tester Gleeble-3800. Then, considering the bulging phenomenon caused by friction and the influence of friction heat and deformation heat, the test results were modified, and the modified Johnson-Cook constitutive model for the material was established. The results show that the flow stress of Cu-Sn alloy is sensitive to strain rate and deformation temperature and the stress-strain curve shows the characteristics of dynamic recrystallization curve. The accuracy of the modified Johnson-Cook constitutive model is verified, and the values of correlation coefficient R and average absolute relative error AARE between the predicted value calculated by the modified Johnson-Cook constitutive model and the test value are 0.9848 and 7.936%, respectively, indicating that the constructed model can accurately predict the change of flow stress for Cu-Sn alloy.

基金项目：

国家重点研发计划（2022YFB3804001）；国家自然科学基金资助项目（52374400）；陕西省教育厅产业化项目（21JC020）

作者简介：鱼祎雯（2001-），女，硕士研究生 E-mail：1273122940@qq.com 通信作者：强凤鸣（1992-），女，博士，讲师 E-mail：qiangfengming@126.com

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