潘永东,钱梦騄,徐卫疆,M.OURAK

• 1:同济大学声学研究所,同济大学声学研究所,D.O.A.E.Universite de Valenciennes BP 311,59304 Valenciennes,France ,D.O.A.E.Universite de Valenciennes BP 311,59304 Valenciennes,France 上海 200092 ,上海 200092

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。

关键词：

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.

Keywords:

基金项目: 中法先进研究计划(PRA Mx00-02);;国家自然科学基金(10134020和10174052)资助项目

通讯作者:

Email:

参考文献：

• 1 Shang C H, Heerden D V, Gavens A J, Weihs T P. An X-ray study of residual stress and bending stress in freestanding Nb/Nb5Si3 microlaminates. Acta materialia, 2000; 48(13) : 3533-3543
• 2 Webster G A, Wimpory R C. Non-destructive measurement of residual stress by neutron diffraction. J. Mater. Processing Technology, 2001; 117(3) : 395-399
• 3 Pao Y, Sache W, FukuokaY H. Physical acoustics. Academic Press, 1984, 17: 61-143
• 4 Jassby K, Saltoun D. Use of ultrasonic Rayleigh waves for the measurement of applied biaxial surface stresses in aluminum 2024-T351 alloy. Materials Evaluation, 1982; 40(2) : 198-205
• 5 Man C S, Lu W Y, Li J B. Effects of crystallographic texture on the acoustoelastic coefficients for Rayleigh waves in aluminum. Rev. of Progress in QNDE, 1999; 18B: 1879-1886
• 6 Duquennoy M, Ouaftouh M, Ourak M. Ultrasonic evaluation stresses in orthotropic materials using Rayleigh waves. NDT & E International, 1999; 32(11) : 189-199
• 7 Duquennoy M, Ouaftouh M, Ourak M. Determination of stresses in aluminum alloy using optical detection of Rayleigh waves. Ultrasonics, 1999; 37(5) : 365-372
• 8 Neubrand A, Hess P. Laser generation and detection of surface acoustic waves: elastic properties of surface layers, J. Appl. Phys., 1992; 71(1) : 227
• 9 Knight B, Braunstein J, Cox J F, Frankel J, Laser-ultrasonic characterization of electrodeposited chromium coatings. Rev. of Prog, in QNDE, 1999; 18: 365-372