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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：用于汽车铝合金的FSSW接头微结构和机械强度的J-积分相关评估

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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J-Intional的裂缝参数评价的抗裂性能量，提出了焊接后微结构和所得机械性能之间的潜在关系的相关评价方法。本文基于该方法，讨论了焊接基础金属组合，AA 5052-H32和6061-T6的效果，同时考虑其不同配置，在微观结构形成和摩擦搅拌点焊（FSSW）关节的进一步拉伸强度，在希望微动机制的希望。通过开发的数值评估模型考虑到固有钩缺损引起的弱化能力，利用虚拟裂纹闭合技术（VCCT）来模拟初始和钩传播期间的开裂过程，以实现更准确的机械响应预测。同时，数值计算主扭结裂缝的J-积分值，以研究局部微观特征变化对整体性能的影响。因此，在搅拌区（SZ）中沉淀的颗粒（Mg2 Si）的钩和量的形态大小在确定剪切强度时起着关键作用。另外，不同的5052/6061关节在膝盖界面处存在突然变化和Si浓度的突然变化，从而使完整性结构在装载过程中更容易损坏。就两个相对的膝部订单而言，在粘合不同合金的同时，将具有更大塑料流动性的5052与上板构成，将产生更大程度的嵌入和混合，伴随着更高的关节强度。

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