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首页> 外文期刊>Journal of Materials Engineering and Performance >Resistance Spot Welding Characteristics and High Cycle Fatigue Behavior of DP 780 Steel Sheet
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Resistance Spot Welding Characteristics and High Cycle Fatigue Behavior of DP 780 Steel Sheet

机译：DP 780钢板的电阻点焊特性和高周疲劳行为

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摘要

Resistance spot welding characteristics of DP 780 steel was investigated using peel test, microhardness test, tensile shear test, and fatigue test. Tensile shear test provides better spot weld quality than conventional peel test and hardness is not a good indicator of the susceptibility to interfacial fracture. The results of high-cycle fatigue behavior of spot welded DP 780 steel under two different parameters show that at high load low cycle range a significant difference in the S-N curve and almost similar fatigue behavior of spot welds at low load high cycle range are obtained. However, when applied load was converted to stress intensity factor, the difference in the fatigue behavior between welds diminished. Furthermore, a transition in fracture mode, i.e., interfacial and plug and hole-type at about 50% of yield load is observed.
机译：使用剥离试验，显微硬度试验，拉伸剪切试验和疲劳试验研究了DP 780钢的电阻点焊特性。拉伸剪切试验提供了比常规剥离试验更好的点焊质量，并且硬度不是界面断裂敏感性的良好指标。点焊DP 780钢在两个不同参数下的高周疲劳行为的结果表明，在高负荷低循环范围内，S-N曲线存在显着差异，并且在低负荷高循环范围内，点焊的疲劳行为几乎相似。但是，当将施加的载荷转换为应力强度因子时，焊缝之间的疲劳行为差异会减小。此外，观察到断裂模式的转变，即在屈服载荷的约50％时的界面和塞孔型的转变。

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