USING LASER ULTRASONICS FOR NONDESTRUCTIVE RESIDUAL STRESS EVALUATION

• 来源期刊: 力学学报（英文版）
• 学科: 物理学
• 关键词: non-contact nondestructive test, aconstoelasticity, residual stress,Rayleigh waves, laser Doppler velocimeter
• 年，卷（期）: 2002,（2）
• 页码范围: 188-192
• 页数: 5页
• 分类号: O3
• 语种: 英文

摘要

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.