圆柱型涂层/基底系统中的激光超声表面波  

Laser thermo-elastic generated surface acoustic waves on cylindrical coating-substrate system

作　　者：赵艳[1] 沈中华[1] 陆健[1] 倪晓武[1] 

机构地区：[1]南京理工大学理学院,南京210094

出　　处：《激光技术》2006年第6期647-649,666,共4页Laser Technology

摘　　要：为了分析圆柱型涂层/基底系统中声表面波的特点及其传播特性,以热弹激发机理为基础建立了脉冲激光在圆柱型涂层/基底系统中激发超声表面波的有限元程序。在此基础上,计算了激光在铝(涂层)/镍(基底)和镍(涂层)/铝(基底)系统中激发的超声表面波波形,它们分别对应了硬涂层系统和软涂层系统。结果表明,圆柱型涂层/基底系统中的超声表面波是色散的,并且其色散特性由弯曲柱面引起的几何色散和涂层/基底系统引起的色散共同决定,这使得圆柱型涂层系统中色散特性远比板状涂层系统杂,不存在简单的正常和反常色散规律。To investigate the propagation of acoustic surface waves in a cylindrical coating-substrate system,a finite element algorithm is put forward to simulate laser inducing acoustic surface wave in cylindrical coating-substrate system based on the thermoelastic mechanism. Using this algorithm,the waveforms of laser-induced acoustic waves on the aluminum（coating）/nickel （substrate） and nickel（ coating）/aluminum（substrate） system are simulated. The results show that surface acoustic wave on the cylindrical coating-substrate system is dispersive. When surface acoustic waves are propagating along the cylindrical structure, there exists geometry dispersion, which makes the dispersion property of the cylindrical coating system more complex than that of a plate coating system. As a result, there is not simple rule for predicating the dispersive property of surface acoustic waves on cylindrical coating-substrate system.

关 键 词：激光物理 声表面波 圆柱型涂层/基底系统 有限元方法 

分 类 号：TN249[电子电信—物理电子学] O426[理学—声学]