Residual stress profiling of an aluminum alloy by laser ultrasonics
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摘要: 为了有效检测铝合金材料上的残余应力分布,研究了用激光超声技术来检测铝合金材料上的残余应力分布的方法。该方法用Nd:YAG脉冲激光激发声表面波,并用外差激光干涉仪接收。理论分析表明可通过测量表面波在不同位置上声速的相对变化,来确定试样的残余应力分布。并对无残余应力、有压缩残余应力、有拉伸残余应力的三个试样应力分布,进行了实验测定。结果证实了试样的残余应力分布可引发声表面波在不同位置上声速的相对变化,也证实了激光激发声表面波及其接收技术是一种无损检测材料内残余应力分布的有效方法。Abstract: In order to effectively determine the residual-stress profile of an aluminum alloy, the measuring method was studied by the laser ultrasonic technique. In this method, surface acoustic waves are generated by a Nd:YAG pulse laser and detected by a heterodyne interferometer. Theoretical analysis shows that the residual-stress profile could be determined by measuring the relative velocity-variation of the surface waves at different locations of the sample. Three samples with no stress, compressive or stretched stress were measured experimentally. The results show that the residual-stress distribution can cause surface waves vary in velocity at different locations, and that this method is an effective technique of nondestructively detecting the residual-stress profile.
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