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Effect of Strain Rate Variation on Fatigue Life of Spot Welded Joint

机译：应变速率变化对点焊接头疲劳寿命的影响

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摘要

Resistance spot welding is used extensively to fasten sheet for automotive applications. In many components, these welds should maintain their integrity under severe loading conditions. However fatigue strength of the spot welded joint is considerably lower than base metal due to stress concentration at the nugget edge, and is influenced by its geometrical and mechanical factors such as welding condition and etc. In this paper, it is estimated that effect of strain rate variation on fatigue life of spot welded joint. The analytical method proposed to overcome above difficult using lethargy coefficient concept for evaluating the fatigue life cycle of spot welded joint. The reliability of the life cycle is completed by comparing with the life cycle obtained by fatigue test for the specimen with the welding current. And the above procedure is numerically extended to get the life of dynamic strain rate region.
机译：电阻点焊广泛用于固定汽车应用的板材。在许多部件中，这些焊缝在严酷的负载条件下应保持其完整性。但是，由于熔核边缘的应力集中，点焊接头的疲劳强度明显低于母材，并且受其几何和机械因素（如焊接条件等）的影响。在本文中，估计了应变的影响速率变化对点焊接头疲劳寿命的影响。提出了一种克服上述困难的分析方法，即使用嗜睡系数概念来评估点焊接头的疲劳寿命周期。通过与通过焊接电流对试样进行疲劳试验而获得的寿命周期进行比较，可以得出寿命周期的可靠性。并在数值上扩展了上述过程，以获得动态应变率区域的寿命。

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