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首页> 外文期刊>International Journal of Fatigue >Finite element analysis of laser shock peening of 2050-T8 aluminum alloy
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Finite element analysis of laser shock peening of 2050-T8 aluminum alloy

机译：2050-T8铝合金激光冲击喷丸的有限元分析

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摘要

Laser shock processing is a recently developed surface treatment designed to improve the mechanical properties and fatigue performance of materials, by inducing a deep compressive residual stress field. The purpose of this work is to investigate the residual stress distribution induced by laser shock processing in a 2050-T8 aeronautical aluminium alloy with both X-ray diffraction measurements and 3D finite element simulation. The method of X-ray diffraction is extensively used to characterize the crystallo-graphic texture and the residual stress crystalline materials at different scales (macroscopic, mesoscopic and microscopic). Shock loading and materials' dynamic response are experimentally analysed using Doppler velocimetry in order to use adequate data for the simulation. Then systematic experience versus simulation comparisons are addressed, considering first a single impact loading, and in a second step the laser shock processing treatment of an extended area, with a specific focus on impact overlap. Experimental and numerical results indicate a residual stress anisotropy, and a better surface stress homogeneity with an increase of impact overlap. A correct agreement is globally shown between experimental and simulated residual stress values, even if simulations provide us with local stress values whereas X-ray diffraction determinations give averaged residual stresses.
机译：激光冲击加工是最近开发的一种表面处理，旨在通过产生深压缩残余应力场来改善材料的机械性能和疲劳性能。这项工作的目的是通过X射线衍射测量和3D有限元模拟研究2050-T8航空铝合金中激光冲击处理引起的残余应力分布。 X射线衍射方法被广泛用于表征不同尺度（宏观，介观和微观）下的晶体图形织构和残余应力晶体材料。为了使用足够的数据进行仿真，使用多普勒测速仪对冲击载荷和材料的动态响应进行了实验分析。然后，首先考虑单个冲击载荷，然后在第二步中对扩展区域的激光冲击处理进行处理，着重于系统的经验与模拟的比较，重点是冲击重叠。实验和数值结果表明，残余应力各向异性和表面应力的均匀性随冲击重叠的增加而增加。即使模拟为我们提供了局部应力值，但在实验和模拟的残余应力值之间总体上显示出正确的协议，而X射线衍射测定给出的是平均残余应力。

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