Ultrasonic vibratory stress relief (UVSR) is a novel method for residual stress relieving of metal parts. In this paper, the UVSR method was applied to treat a random-sized plate, which is not designed to match with the resonant frequency of the ultrasonic transducer. The UVSR system includes an ultrasonic generator, a 20 kHz ultrasonic transducer and specially designed fixtures to exert ultrasonic vibration to the treated parts. Based on the experimental results, the average stress relief ratio reached 53% and the final residual stress distribution interval was reduced by 57. The vibratory stress introduced by the ultrasonic vibration was obtained accurately by matching the FE model with the measured vibration amplitude distribution. It is found that local yield stress, instead of macroscopic yield stress, should be used as the threshold of residual stress relieving. Moreover, if the local yield stress of a material is constant, the local yield stress of 6082 aluminum alloy is reduced by at least 27% during the UVSR. Finally, it is found that the residual stress relief rate in one direction is proportional to the vibratory stress introduced in that direction.

中文翻译：

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利用超声波振动消除焊接铝合金板的残余应力

超声波振动应力消除（UVSR）是一种消除金属零件残余应力的新方法。在本文中，UVSR 方法应用于处理随机尺寸的板，该板的设计与超声换能器的共振频率不匹配。UVSR 系统包括一个超声波发生器、一个 20 kHz 超声波换能器和专门设计的夹具，用于对处理过的零件施加超声波振动。根据实验结果，平均应力消除率达到53%，最终残余应力分布区间减少了57。通过有限元模型与实测振动幅值分布的匹配，准确获得了超声振动引入的振动应力。发现局部屈服应力，而不是宏观屈服应力，应作为残余应力消除的阈值。而且，如果材料的局部屈服应力不变，6082铝合金在UVSR过程中局部屈服应力至少降低27%。最后，发现一个方向的残余应力释放率与该方向引入的振动应力成正比。