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首页> 外文期刊>Journal of thermal stresses >FAILURE ASSESSMENT OF LASER SPOT-WELDED ELECTRONIC CONNECTOR STRUCTURES
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FAILURE ASSESSMENT OF LASER SPOT-WELDED ELECTRONIC CONNECTOR STRUCTURES

机译:激光点焊电子连接器结构的故障评估

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摘要

Characteristics of a pulsed Nd:YAG laser spot-welding procedure applied to electronic connector structures are investigated in the current study. A volumetric heat source equation coded in a user subroutine DFLUX is implemented into a finite element commercial package ABAQUS. Bead shapes including both the pool diameter and the penetration depth of SUS304 stainless steel sheets under various laser intensities are predicted and compared with the associated observations Plastic behaviors of the fusion zone are estimated based on the micro-indentation test. The Gurson-type damage model is incorporated into the numerical analysis using a user subroutine VUMAT to describe the damage evolution of spot-welded structures. Designed spot-welded specimens subjected to the tensile-dominated and shear-dominated loading conditions were conducted. Experimental measurements were then used to evaluate parameters required in the damage model. Structure strength of a stainless steel sheet assembled with a metallic shell of an electronic connector utilizing laser spot-welding is further examined, and results based on the simulation agree well with those based on the experiments. A possibility of the usage of numerical simulations to achieve the efficient welding spot layout is finally demonstrated.
机译:当前研究中研究了应用于电子连接器结构的Nd:YAG脉冲激光点焊过程的特性。在用户子例程DFLUX中编码的体积热源方程在有限元商业软件包ABAQUS中实现。预测了珠光形状,包括在不同激光强度下的SUS304不锈钢薄板的熔池直径和穿透深度,并与相关的观察结果进行了比较,并根据微压痕测试估算了熔合区的塑性行为。使用用户子例程VUMAT将Gurson型损伤模型合并到数值分析中,以描述点焊结构的损伤演变。进行了受拉伸支配和剪切支配加载条件的设计点焊试样。然后使用实验测量来评估损伤模型中所需的参数。进一步检查了利用激光点焊组装有电子连接器的金属壳的不锈钢板的结构强度,并且基于模拟的结果与基于实验的结果非常吻合。最后证明了使用数值模拟实现有效焊点布局的可能性。

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