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首页> 外文会议>International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia >Internal cracking during surface treatment of 7050-T74 aluminium alloy using laser shock peening
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Internal cracking during surface treatment of 7050-T74 aluminium alloy using laser shock peening

机译：7050-T74铝合金表面激光冲击喷丸时的内部开裂

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摘要

Laser shock peening is a novel mechanical surface treatment for fatigue life extension of metallic materials; it creates a much deeper compressive residual stress layer than that from shot peening, offering the prospect of very effective crack growth retardation. Tests on aircraft aluminium alloy have shown that LSP can produce large fatigue life extensions. However, some tests revealed significant technological risk in cases where the LSP processing is not well controlled; in these cases LSP may cause internal cracking, which results in a reduction in fatigue life. The main factors promoting the internal cracking in LSP aluminium alloy are laser power (or intensity) and poor transverse material properties. Careful control of the process can prevent the occurrence of such problems and allow exploitation of the potential life extension.
机译：激光冲击喷丸是一种新颖的机械表面处理，可延长金属材料的疲劳寿命；与喷丸处理相比，它产生了更深的压缩残余应力层，提供了非常有效的延缓裂纹扩展的前景。在飞机铝合金上的测试表明，LSP可以延长疲劳寿命。但是，一些测试显示，如果LSP处理没有得到很好的控制，则存在很大的技术风险。在这些情况下，LSP可能会导致内部破裂，从而导致疲劳寿命降低。促使LSP铝合金内部开裂的主要因素是激光功率（或强度）和横向材料性能差。仔细控制过程可以防止此类问题的发生，并可以延长使用寿命。

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