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首页> 外文期刊>Journal of Manufacturing Processes >J-integral based correlation evaluation between microstructure and mechanical strength for FSSW joints made of automotive aluminum alloys
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J-integral based correlation evaluation between microstructure and mechanical strength for FSSW joints made of automotive aluminum alloys

机译：基于J积分的汽车铝合金FSSW接头的组织与机械强度之间的相关性评估

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摘要

Through using the crack resistance energy evaluated by a fracture parameter of J-integral, a correlation evaluation approach for potential relationships between post-weld microstructure and resultant mechanical properties was proposed. The present article, based on this method, discussed the effects of welded base metal combinations, AA 5052-H32 and 6061-T6 while considering their dissimilar configuration, on microstructure forming and further tensile strength of friction stir spot-welded (FSSW) joints, in the hope of micro-action mechanism. With the developed numerical evaluation model considering the weakened binding capability caused by inherent Hook defect, the cracking process during the initial and Hook propagation was simulated utilizing Virtual Crack Closure Technique (VCCT) to achieve a more accurate prediction of mechanical response. Meanwhile, both J-integral values of main kinked cracks was numerically calculated to study the influence of changes in local microscopic features on the overall performance. Consequently, morphological size of the Hook and amount of precipitated particles (Mg2Si mainly) in the stir zone (SZ) play key roles in determining the shear strength. Additionally, the dissimilar 5052/6061 joints exist a sudden change in Mg and Si concentrations at lap interface, thus making the integrity structure more prone to damage during loading. In terms of the two opposite lap orders while bonding dissimilar alloys, configuring the 5052 with greater plastic fluidity to the upper plate will yield a greater degree of embedding and mixing, accompanied by higher joint strength.
机译：通过使用由J积分断裂参数评估的抗裂能，提出了一种相关的评估方法，用于焊接后的微观结构与所得力学性能之间的潜在关系。本文基于这种方法，讨论了焊接母材组合，AA 5052-H32和6061-T6，同时考虑了它们的不同构型，对摩擦搅拌点焊（FSSW）接头的组织形成和进一步的拉伸强度的影响，希望有微作用机制。利用开发的数值评估模型，该模型考虑了固有的Hook缺陷导致的结合能力减弱，利用虚拟裂纹闭合技术（VCCT）对初始和Hook传播过程中的开裂过程进行了模拟，以实现对机械响应的更准确预测。同时，数值计算了两个主要扭结裂纹的J积分值，以研究局部微观特征的变化对整体性能的影响。因此，在搅拌区（SZ）中，胡克的形态尺寸和沉淀颗粒（主要是Mg2Si）的含量在确定剪切强度方面起着关键作用。此外，异种的5052/6061接头在搭接界面处的Mg和Si浓度会突然变化，从而使整体结构在加载过程中更易于损坏。在粘合异种合金时，按照两个相反的搭接顺序，将5052配置为具有更大的塑性到上板的流动性，将产生更大程度的嵌入和混合，并具有更高的接合强度。

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