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Using laser ultrasonics for nondestructive residual stress evaluation

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Abstract

A non-contact measuring technique of ultrasonic waves velocity is proposed, in which Rayleigh waves are detected by a laser Doppler velocimeter and the velocity is measured precisely by means of a sing-around unit and a digital oscilloscope. With the proposed technique, the acoustoelastic coefficient of Rayleigh waves in mild steel SS41 is obtained, which is in good agreement with that obtained by the contact method. Furthermore the non-contact technique is applied to evaluate the residual stress in a butt-welded steel plate, the result is reasonable.

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Authors and Affiliations

  1. College of Traffic & Communications, South China University of Technology, 510640, Guangzhou, China

    He Lingfeng

  2. Department of Construction Eng, Fukui University of Technology, 910-8505, Fukui, Japan

    Shoichi Kobayashi

Authors
  1. He Lingfeng
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  2. Shoichi Kobayashi
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Lingfeng, H., Kobayashi, S. Using laser ultrasonics for nondestructive residual stress evaluation. Acta Mech Sinica 18, 188–192 (2002). https://doi.org/10.1007/BF02487473

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  • DOI: https://doi.org/10.1007/BF02487473

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