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Volume 30 Issue 3
Aug.  2022
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XU Boqiang, SHEN Zhonghua, NI Xiaowu, GUAN Jianfei, LU Jian. Numerical simulation of laser thermo-elastic generated surface acoustic waves by finite element method in coating/substrate systems[J]. ACTA ACUSTICA, 2005, 30(3): 201-206. DOI: 10.15949/j.cnki.0371-0025.2005.03.002
Citation: XU Boqiang, SHEN Zhonghua, NI Xiaowu, GUAN Jianfei, LU Jian. Numerical simulation of laser thermo-elastic generated surface acoustic waves by finite element method in coating/substrate systems[J]. ACTA ACUSTICA, 2005, 30(3): 201-206. DOI: 10.15949/j.cnki.0371-0025.2005.03.002
shu

Numerical simulation of laser thermo-elastic generated surface acoustic waves by finite element method in coating/substrate systems

  • 1. Faculty of Science, Jiangsu University Zhenjiang 212013;

  • 2. Dept. of Appl. Physics, Nanjing University of Sci. & Tech. Nanjing 210094

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  • PACS: 
    • 43.60  (声学信号处理)
  • Received Date: August 12, 2003
  • Revised Date: April 08, 2004
  • Available Online: August 04, 2022
    Graphical Abstract
    • Abstract
  • Laser generated surface acoustic waves provide a useful tool for determining the elastic properties of coatings. Taking the temperature dependence of material properties into consideration, an optimized finite element is developed to simulate the laser thermo-elastic generation and propagation of surface acoustic waves in coating/substrate systems based on a well understanding of the influences of element size and integration time step on the solution stability. Besides the surface skimming longitudinal waves, a normal dispersive surface acoustic wave is observed in slow coating and fast substrate combination, while an anomalous dispersive surface acoustic wave is observed in fast coating and slow substrate combination, which confirm the validity of this model. Furthermore, a pseudo surface acoustic wave is observed in fast coating and slow substrate combination by decreasing the size of the laser spot, which allows generating higher frequency than the cutoff frequency of this system.
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