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华东理工大学 机械与动力工程学院,上海 200237
李杰,男,1998年生,山东日照人,在读硕士研究生;主要研究方向为金属材料蠕变变形的数字孪生仿真方法;E-mail:1971866212@qq.com。
收稿日期:2023-08-20,
修回日期:2023-12-05,
纸质出版日期:2025-05-15
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李杰,赵鹏,张剑睿,等. 基于损伤力学的7050-T7451铝合金蠕变本构模型[J]. 机械强度,2025,47(5):152-158.
LI Jie,ZHAO Peng,ZHANG Jianrui,et al. Creep constitutive model of 7050-T7451 aluminum alloy based on damage mechanics[J]. Journal of Mechanical Strength,2025,47(5):152-158.
李杰,赵鹏,张剑睿,等. 基于损伤力学的7050-T7451铝合金蠕变本构模型[J]. 机械强度,2025,47(5):152-158. DOI: DOI:10.16579/j.issn.1001.9669.2025.05.017.
LI Jie,ZHAO Peng,ZHANG Jianrui,et al. Creep constitutive model of 7050-T7451 aluminum alloy based on damage mechanics[J]. Journal of Mechanical Strength,2025,47(5):152-158. DOI: DOI:10.16579/j.issn.1001.9669.2025.05.017.
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.
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