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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >Fatigue crack propagation into the residual stress field along and perpendicular to laser beam butt-weld in aluminium alloy AA6056
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Fatigue crack propagation into the residual stress field along and perpendicular to laser beam butt-weld in aluminium alloy AA6056

机译：疲劳裂纹沿着并垂直于铝合金AA6056的激光束传播到残余应力场中

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摘要

Laser beam butt welds in Al-alloys are very narrow and are accompanied by steep residual stress gradients. In such a case, how the initial crack orientation and the distance of the notch tip relative to the weld affect fatigue crack propagation has not been investigated. Therefore, this investigation was undertaken with two different crack orientations: along the mid-weld and perpendicular to the weld. Fatigue crack propagation 'along the mid-weld' was found to be faster in middle crack tension specimens than in compact tension specimens. For the crack orientation 'perpendicular to the weld', the relative distance between the notch tip and the weld was varied using compact tension specimens to generate either tensile or compressive residual stresses near the notch tip. When tensile residual stresses were generated near the notch tip, fatigue crack propagation was found to be faster than that in the base material, irrespective of the difference in the initial residual stress level and whether the crack propagated along the mid-weld or perpendicular to the weld. In contrast, when compressive weld residual stresses were generated near the notch tip, fatigue crack arrest, slow crack propagation, multiple crack branching and out of plane deviation occurred. The results are discussed by considering the superposition principle and possible practical implications are mentioned.
机译：铝合金中的激光对接焊缝非常狭窄，并伴随着陡峭的残余应力梯度。在这种情况下，尚未研究初始裂纹取向和缺口尖端相对于焊缝的距离如何影响疲劳裂纹扩展。因此，本研究以两种不同的裂纹方向进行：沿着焊缝的中部和垂直于焊缝。研究发现，在中间裂纹拉伸试样中，“沿中间焊缝”的疲劳裂纹扩展快于在紧凑拉伸试样中。对于“垂直于焊缝”的裂纹取向，使用紧凑的拉伸试样来改变缺口尖端与焊缝之间的相对距离，以在缺口尖端附近产生拉应力或压缩残余应力。当在切口尖端附近产生拉伸残余应力时，发现疲劳裂纹的扩展要快于基体材料，而不管初始残余应力水平是否不同，以及裂纹是沿焊缝中部还是垂直于裂纹扩展。焊接。相反，当在切口尖端附近产生压缩焊接残余应力时，会出现疲劳裂纹停止，裂纹扩展缓慢，多个裂纹分支和面外偏差。通过考虑叠加原理讨论了结果，并提到了可能的实际含义。

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