Void coalescence and ductile fracture in automotive aluminum alloys

近年来，汽车行业一直在寻求通过减轻车辆重量来提高整体车队的燃油效率。铝合金作为一种可行的轻量化汽车面板和结构部件的钢材替代品，已经获得了突出的地位。然而，近年来的研究表明，在成形过程中，孔隙损伤会导致韧性断裂，从而限制了铝合金的成形性能。塑性断裂的数值模拟为研究合金的微观组织特征和成形行为提供了一种桥梁工具，以改善合金的微观组织以满足汽车工业的需要。然而，尽管它在技术上很重要，但对铝合金中的空洞合并和韧性断裂缺乏基本的了解。因此，系统地研究孔洞聚结和韧性断裂是很有意义的。

In recent years, the automotive industry has sought to increase overall fleet fuel efficiency through vehicle weight reduction. Aluminum alloys have gained prominence as a viable lightweight alternative to steel for automotive panels and structural components. However, recent research has revealed that void-damage induces ductile fracture during the forming processes, and therefore, limits the formability of aluminum alloys. Numerical simulations of ductile fracture provide a tool to bridge the microstructural features and forming behaviour in order to improve the microstructures of these alloys to meet the need in the automotive industry. However, despite its technological importance, a fundamental understanding of void coalescence and ductile fracture in aluminum alloys is lacking. Therefore, a systematic investigation of void coalescence and ductile fracture is of great interest.