Growing environmental demands and higher fuel efficiency encourage the use of new light‐weight load‐bearing materials even for operation under rougher environmental conditions. Consequently, as the materials used in the vital load‐bearing components of the chassis, brake system or exhaust system are subjected to thermomechanical fatigue during the operation due to variable mechanical and thermal loads, it is crucial for design engineers and CAE analysts to understand the cyclic behaviour of new materials under such conditions. Here we have analysed the stress–strain behaviour of magnesium alloy AZ31 and the influence of variable thermomechanical loads. A uniaxially loaded flat specimen has been first mechanically loaded at −25°C. The temperature was then increased to 150°C whilst the variable mechanical loading remained unchanged. The tests have been strain‐controlled using a video extensometer. The stress–strain behaviour of the magnesium alloy AZ31 has been then investigated considering both variable temperature and variable mechanical load.

中文翻译：

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可变热机械载荷下镁合金AZ31应力-应变行为的确定

日益增长的环境要求和更高的燃油效率鼓励甚至在恶劣的环境条件下运行时也要使用新型的轻质承重材料。因此，由于底盘，制动系统或排气系统的重要承重组件中使用的材料在运行过程中会由于可变的机械和热负载而遭受热机械疲劳，因此对于设计工程师和CAE分析师而言，了解这些特性至关重要。在这种条件下新材料的循环行为。在这里，我们分析了镁合金AZ31的应力-应变行为以及可变热机械载荷的影响。首先在-25°C的条件下对单轴加载的扁平样本进行机械加载。然后将温度升至150℃，同时可变的机械负荷保持不变。使用视频引伸计对测试进行了应变控制。然后研究了镁合金AZ31的应力-应变行为，同时考虑了可变温度和可变机械负载。