Laser shock peening on fatigue crack growth behaviour of aluminium alloy
Laser shock peening on fatigue crack growth behaviour of aluminium alloy
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DOI：
10.1111/j.1460-2695.2004.00763.x
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发表时间：
2004-08
影响因子：
3.7
通讯作者：
Y. Tan;Guocai Wu;Jenn‐Ming Yang;T. Pan
中科院分区：
文献类型：
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作者：
Y. Tan;Guocai Wu;Jenn‐Ming Yang;T. Pan
研究了激光冲击强化对不同缺口几何形状2024-T3铝合金疲劳裂纹扩展行为的影响。LPS在“受限烧蚀模式”下进行，使用激光功率密度为5 GW cm -2的Nd：玻璃激光器。黑色涂料涂层层和水层分别作为牺牲层和等离子体约束层。冲击波传播到材料中，引起表层塑性变形，从而在表面产生残余压应力。利用x射线衍射技术测量了残余压应力随深度的变化规律。研究了具有不同缺口形态的铝合金的疲劳裂纹萌生寿命和裂纹扩展速率，并与未开缺口的材料进行了比较。结果清楚地表明，LSP是一种有效的表面处理技术，可以抑制各种预先存在缺口的铝合金的疲劳裂纹扩展。
The effect of laser shock peening (LPS) in the fatigue crack growth behaviour of a 2024-T3 aluminium alloy with various notch geometries was investigated. LPS was performed under a 'confined ablation mode' using an Nd: glass laser at a laser power density of 5 GW cm -2 . A black paint coating layer and water layer was used as a sacrificial and plasma confinement layer, respectively. The shock wave propagates into the material, causing the surface layer to deform plastically, and thereby, develop a residual compressive stress at the surface. The residual compressive stress as a function of depth was measured by X-ray diffraction technique. The fatigue crack initiation life and fatigue crack growth rates of an Al alloy with different preexisting notch configurations were characterized and compared with those of the unpeened material. The results clearly show that LSP is an effective surface treatment technique for suppressing the fatigue crack growth of Al alloys with various preexisting notch configurations.