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Modelling particle-induced damage during forming of aluminium alloys

机译：模拟铝合金成型过程中颗粒引起的损伤

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摘要

As shown by mean of tomographic investigations [I], in aluminium alloys containing dilute concentrations of hard particles, damage during forming is observed to mostly initiate on particles. It initiates either as particle fracture or as particle/matrix de-bonding, and then grows as void opening, up to void coalescence and material ruin. While many modelling attempts since the works of Rice and Tracey [2] and Gurson [3] have concentrate their efforts to the void growth description, simplifying the underlying microstructure in disregarding the particles, some other ones have on the contrary paid major attention to the particle shape and stiffness effects on both the void nucleation and their opening. Following previous attempts of that type [4,5,6], a model for particle-induced damage is here derived from the introduction of phases representing damaged particles in a homogenisation framework for elastic-plastic heterogeneous materials.
机译：如断层扫描研究[I]所示，在含有稀浓度硬质颗粒的铝合金中，观察到成形过程中的损坏主要发生在颗粒上。它以颗粒破裂或颗粒/基体脱粘的形式开始，然后以空隙开口的形式生长，直至空隙聚结和材料破坏。自Rice和Tracey [2]和Gurson [3]的工作以来，许多建模尝试都将精力集中在空隙生长描述上，简化了忽略微粒的底层微观结构，但相反，其他一些研究则主要关注颗粒的形状和刚度对空隙形核及其开口都有影响。继先前[4,5,6]类型的尝试之后，在此引入了代表弹塑性异质材料均质化框架中代表受损粒子的相，从而引入了粒子引起的损伤的模型。

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