Abstract A constitutive material model, which predicts the material behaviour of an Al–Si–Mg–Cu alloy under thermomechanical load, is proposed. Moreover, an ageing model is used to simulate the ageing behaviour, which also affects the hardening parameters. A new strategy for determining the material parameters is proposed, and a new testing concept for investigating the ageing properties of materials is presented. Thermomechanical fatigue tests are used to validate the material model. The results of the simulations show that it is possible to determine the material parameters based on low-cycle fatigue, relaxation, and ageing tests such that a cycle-by-cycle simulation of thermomechanical fatigue tests is possible. Finally, a comparison of the simulation and test results show a good agreement.

中文翻译：

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热机械载荷作用下铝合金时效行为的研究与模拟

摘要 提出了一种本构材料模型，该模型可预测 Al-Si-Mg-Cu 合金在热机械载荷下的材料行为。此外，时效模型用于模拟时效行为，这也会影响硬化参数。提出了确定材料参数的新策略，并提出了研究材料老化性能的新测试概念。热机械疲劳试验用于验证材料模型。模拟结果表明，可以根据低周疲劳、松弛和老化试验确定材料参数，从而可以对热机械疲劳试验进行逐周期模拟。最后，仿真和测试结果的比较显示出良好的一致性。