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Residual Stresses Induced by Laser Peening of Thin Aluminium Plates

机译：铝薄板激光喷丸引起的残余应力

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Laser shock peening offers potential advantages over conventional peen technologies in terms of the depth of the residual stresses that can be induced, and improvements in surface roughness. In this study the application of laser peening to thin aluminium plates such as are used in aerospace applications is investigated. Peening of thin plates presents challenges in balancing the peen intensity to prevent overpeening that will actually lower the stress field. Strain profiles for different laser peening parameters were obtained using synchrotron X-ray diffraction at the ESRF, France. Results are presented and discussed of the residual strain profiles in terms of the laser power density and the number of peen passes. When the power density and number of passes are increased the compressive strain magnitudes are also increased, as has been observed in previous studies. However, the strain components longitudinal and transverse to the peen line are not identical to each other, with the transverse component being much less compressive.
机译：就可引起的残余应力的深度和表面粗糙度的改善而言，激光冲击喷丸相对于传统的喷头技术具有潜在的优势。在这项研究中，研究了激光喷丸在薄铝板上的应用，例如在航空航天中使用的薄板。薄板的喷丸在平衡喷头强度以防止喷丸实际上会降低应力场方面提出了挑战。使用法国ESRF的同步加速器X射线衍射获得了不同激光喷丸参数的应变曲线。呈现并讨论了根据激光功率密度和尖峰通过次数得出的残余应变曲线的结果。如先前研究中所观察到的，当功率密度和通过次数增加时，压缩应变幅度也增加。但是，纵向和横向于钉线的应变分量彼此不相同，而横向分量的压缩性小得多。

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