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首页> 外文期刊>Engineering Fracture Mechanics >Sheet thickness effect of spot welds based on crack propagation
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Sheet thickness effect of spot welds based on crack propagation

机译：基于裂纹繁殖的点焊薄板厚度效应

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摘要

Analysis of spot-weld fatigue problems is usually conducted using a so-called structural-stress approach (Rupp A, Storzel K, Grubisic V. Computer aided dimensioning of spot-welded automotive structures. SAF Technical Paper 950711, 1995, and others). However, this approach is not able to explain the observed sheet thickness (t) effect, which is also well known in seam welded joints. whereby fatigue lives are shorter in sheets of greater thickness when the structural stress is kept constant. The present paper develops a fracture-mechanics approach which takes advantage of the fact that the initial, uncracked weld can be modelled as a body containing a crack (after Radaj (Radaj D. Stress singularity, notch stress and structural stress at spot-welded joints. Engineering Fracture Mechanics 1989;34(2):495-506.) and Cooper (Cooper JF. Fatigue of spot-welds. Ph.D. thesis. Cambridge University, 1986.)], allowing the Paris law to be used from the first cycle. The number of cycles to failure was found to depend on t{sup}s where s is material dependent and close to 0.5 ia certain cases. This is in accordance with the experimental data; the approach was used to successfully predict a specific experimental data set.
机译：斑焊疲劳问题的分析通常使用所谓的结构应力方法（RUPP A，Storzel K，Groubisic V.计算机辅助尺寸的点焊汽车结构的计算机辅助尺寸。SAF技术纸张950711,1995等）。然而，这种方法无法解释观察到的纸张厚度（T）效果，其在接缝焊接接头中也是众所周知的。当结构应力保持恒定时，疲劳寿命较短的厚度较短。本文开发了一种骨折 - 力学方法，利用初始，未包装的焊接可以以含有裂缝（RadaJ D之后（RadaJ D.rance-Wonded Constence）的裂缝（Radaj D.rance奇异性，Notch Regress和结构应力）建模的事实。 。工程骨折1989; 34（2）：495-506。第一个循环。发现失败的循环次数依赖于{sup} s，其中s是依赖的材料，接近0.5 is的某些情况。这是根据实验数据;该方法用于成功预测具体的实验数据集。

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