疲劳裂纹扩展过程中焊接残余应力重分布测试
A novel method for evaluation of welding residual stress redistribution during fatigue crack growth
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摘要:
提出了一种新的焊接残余应力在疲劳裂纹扩展过程中重分布规律的测试方法，并给出了相应的计算公式.在裂纹扩展的路径上粘贴若干三向电阻应变片，然后利用动态应变仪实时采集裂纹扩展过程中的应变变化，根据所推导的公式换算成相应的残余应力变化，从而得到裂纹扩展过程中残余应力重分布的规律.利用这种方法，试验测试了高强钢TIG焊接接头在疲劳裂纹扩展过程中的焊接残余应力重分布规律，并与一种解析的方法进行了对比.结果表明，该方法能够更为准确地表征裂纹扩展过程中焊接残余应力重分布的情况.
Abstract:A novel methodology for evaluation of welding residual stress (WRS) redistribution during fatigue crack growth (FCG) was proposed in this paper and some necessary equations were derived. By using strain gauge rosettes (with three strain gauges of different directions manufactured on one substrate) attached to the surface of the sample along the potential crack propagation path, the amounts of strain change were collected by a dynamic strain testing system and the corresponding amounts of WRS redistribution were calculated following our equations, which were used to characterize the WRS redistribution thereafter. Experimental tests were carried out to determine the redistribution of WRS during FCG of a high strength steel welded joint employing our proposed methodology. It turned out that this straightforward methodology was capable of accurately capturing the WRS redistribution during FCG relative to an analytical method proposed previously in the literature.
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