Shear strength of CMT brazed lap joints between aluminum and zinc-coated steel
Shear strength of CMT brazed lap joints between aluminum and zinc-coated steel
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DOI：
10.1016/j.jmatprotec.2013.02.011
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发表时间：
2013-08
影响因子：
6.3
通讯作者：
Jian Lin;N. Ma;Y. Lei;H. Murakawa
中科院分区：
文献类型：
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作者：
Jian Lin;N. Ma;Y. Lei;H. Murakawa
6061铝合金与高强度镀锌钢板（DP 600）或厚板（1.2mm）的CMT钎焊搭接接头具有较高的剪切强度和熔合线破坏。只有当铝与低强度（270MPa）薄钢板（0.7mm）钎焊时，才能观察到较低的剪切强度和界面破坏。建立了CMT搭接接头抗剪强度和破坏模式的预测模型。采用CMT接头界面层的最大主应力和变形能作为界面失效预测的失效判据。采用CMT钎焊接头焊缝金属、热影响区和铝侧母材的等效塑性应变作为熔合线失效预测的判据。通过所建立的数值模型可以准确地估算CMT节点的抗剪强度和两种破坏模式。
Higher shear strength and fusion line failure were measured in CMT brazed lap joint of aluminum alloy 6061 and zinc coated steels with high strength (DP600) or thick plate (1.2mm). Lower shear strength and interface failure were observed only if aluminum was brazed with low strength (270MPa) and thin steel sheet (0.7mm). A numerical model was developed for the prediction of shear strength and failure modes of the CMT lap joints. The maximum principle stress and deformation energy at the interface layer of the CMT joints were adopted as failure criteria for interface failure prediction. The equivalent plastic strain in the weld metal, HAZ and base metal of aluminum side of the CMT brazed joints was used as a criterion for failure prediction occurred on the fusion line. The shear strength of CMT joints and the two failure modes can be accurately estimated by the developed numerical model.