Effects of laser shock processing on high cycle fatigue crack growth rate and fracture toughness of aluminium alloy 6082-T651
Effects of laser shock processing on high cycle fatigue crack growth rate and fracture toughness of aluminium alloy 6082-T651
复制标题
DOI：
10.1016/j.ijfatigue.2016.02.027
复制
发表时间：
2016-06-01
影响因子：
6
通讯作者：
Grum, Janez
中科院分区：
文献类型：
--
作者：
Bergant, Zoran;Trdan, Uros;Grum, Janez
研究了无保护涂层的激光冲击加工对高周疲劳裂纹扩展和断裂韧性的影响。对致密拉伸试样从垂直于裂纹扩展方向的两侧进行激光冲击喷丸处理，然后进行后续磨削。疲劳裂纹扩展试验的频率为 116 至 146 Hz，R = 0.1，疲劳裂纹萌生阶段和 K 递减试验期间应力强度范围恒定。引发疲劳预裂纹所需的循环次数较少，并且在 LSP 处理的试样的拉伸残余应力场中发现更快的疲劳裂纹扩展。 LSP处理后裂纹扩展阈值降低了60%。 LSP处理后断裂韧性下降28-33%。断口表面上的疲劳-延性过渡边界显示未处理样品中的线性疲劳裂纹前沿和 LSP 处理后的曲线。 (C) 2016 Elsevier Ltd. 保留所有权利。
The effects of laser shock processing without protective coating on high-cycle fatigue crack growth and fracture toughness were investigated. Laser shock peening treatment was performed on compact tension specimens from both sides perpendicular to the crack growth direction, followed by subsequent grinding. Fatigue crack growth tests were performed at frequencies between 116 and 146 Hz, at R = 0.1 and a constant stress intensity range during the fatigue crack initiation phase and K-decreasing test. A lower number of cycles was required to initiate a fatigue precrack, and faster fatigue crack growth was found in tensile residual stress field of LSP-treated specimens. The crack growth threshold decreased by 60% after LSP treatment. The fracture toughness decreased by 28-33% after LSP treatment. The fatigue-to-ductile transition boundary on fractographic surfaces show linear fatigue crack fronts in non-treated specimens and curves after LSP treatment. (C) 2016 Elsevier Ltd. All rights reserved.