Acoustoelastic determination of residual stress with laser doppler velocimetry |
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Authors: | L. F. He S. Kobayashi |
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Affiliation: | (1) College of Traffic and Communications, South China University of Technology, Wu-shan, 510640 Guangzhou, China;(2) Department of Construction Engineering, Fukui University of Technology, Gakuen 3-6-1, 910-8505 Fukui, Japan |
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Abstract: | The main object of this study is to develop a new technique for stress nondestructive measurement. A noncontact measurement technique of ultrasonic wave velocity is proposed. In the measurement system, a laser Doppler velocimeter, which is noncontact, is used to detect wave motions due to Rayleigh waves instead of a piezoelectric transducer. The noncontact measurement technique is applied to determine the stress-acoustic coefficient of Rayleigh waves for aluminum 5052 and a structural steel, and the results are in good agreement with those obtained using knife-edge piezoelectric transducers. The technique is also used to evaluate residual stress existing in an H-section rolled beam of the structural steel. The distribution of residual stress is reasonable. |
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Keywords: | Residual stresses stress-acoustic coefficient noncontact measurement laser Doppler velocimeter Rayleigh waves |
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