文献类型：期刊文献

中文题名：基于损伤力学的7050-T7451铝合金蠕变本构模型

英文题名：Creep constitutive model of 7050?T7451 aluminum alloy based on damage mechanics

作者：李杰[1];赵鹏[1];张剑睿[1];胡越[1];轩福贞[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237

年份：2025

卷号：47

期号：5

起止页码：152

中文期刊名：机械强度

外文期刊名：Journal of Mechanical Strength

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2021YFB3702200);上海市自然科学基金项目(21ZR1418200)。

语种：中文

中文关键词：金属蠕变;连续损伤模型;沉淀粗化;微孔洞损伤;位错演化

外文关键词：Metal creep;Continuum damage model;Precipitation coarsening;Microvoid damage;Dislocation evolution

摘要：通过单轴拉伸蠕变试验,研究了7050-T7451铝合金在不同温度和应力下的蠕变行为。基于连续介质损伤力学,建立了描述铝合金高温蠕变行为的本构模型。该模型考虑了蠕变过程中的沉淀相粗化、位错增殖/湮灭和微孔洞形成等微观组织演化过程,并通过相应的损伤因子演化公式来反映这3个损伤过程,还考虑了应力增加所带来的额外损伤,以揭示应力对蠕变损伤的影响。基于试验结果和预测结果的对比分析,验证了所建立的物理本构模型可以较准确地描述7050铝合金在不同温度和应力条件下的蠕变行为。
The creep behavior of 7050-T7451 aluminum alloy under different temperatures and stresses was studied by the uniaxial tensile creep test.Based on continuum damage mechanics,a constitutive model describing the creep behavior of aluminum alloy at high temperature was established.The model took into account the precipitation coarsening,dislocation multiplication/annihilation and microvoid formation during the creep process,and introduced the corresponding damage factor evolution formula to reflect these three damage processes.In addition,the model took into account the additional damage caused by stress increase to reveal the effect of stress on the creep damage.Based on the comparative analysis of the test results and the predicted results,it was verified that the established physical constitutive model can accurately describe the creep behavior of 7050 aluminum alloy under different temperatures and stresses.