Experimental Investigation of Fatigue Crack Propagation in Residual Stress Fields
Experimental Investigation of Fatigue Crack Propagation in Residual Stress Fields
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DOI：
10.1016/j.proeng.2015.12.664
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Hensel;T. Nitschke–Pagel;J. Rebelo-Kornmeier;K. Dilger
中科院分区：
文献类型：
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作者：
J. Hensel;T. Nitschke–Pagel;J. Rebelo-Kornmeier;K. Dilger
本文研究了焊接钢板中残余应力与疲劳裂纹的相互作用。纵向虚拟焊缝用于在轴向载荷方向上产生高拉伸残余应力。疲劳裂纹被训练成在人工缺口处开始，并通过高拉伸残余应力场传播。采用组合试验方法，对疲劳裂纹扩展和残余应力重分布进行了详细的研究。平均应力以及所用样品的残余应力状态是变化的。在R =（σmin/σmax）= 0、R = -1和R =-3条件下，对样品进行焊接和应力消除试验。试验材料为典型的细晶结构钢S355 J2 +N和高强度调质钢S960 QL，研究了残余应力是如何衰减的，以及中等残余应力是如何影响焊接钢板疲劳强度的。讨论了残余应力和载荷平均应力的综合效应。
This work is on the interaction of residual stresses and fatigue cracks in welded steel plates. A longitudinal dummy weld was used to create high tensile residual stresses in axial loading direction. The fatigue crack was trained to start at an artificial notch and propagated through a field of high tensile residual stresses. The fatigue crack propagation as well as the re-distribution of residual stresses were studied in detail by combined experimental methods. The mean stress was varied as well as the residual stress state of the samples used. Samples were tested as-welded as well as stress-relieved at R = (σmin/σmax) = 0, R = -1 and R = -3. The materials used were a typical fine grained construction steel S355J2+N as well as a high strength quenched and tempered steel S960QL.It is shown how residual stress are degraded and in which way moderate residual stresses affect the fatigue strength of welded steel plates. The combined effect of residual stresses and load mean stresses is discussed.