Numerical simulation of surface acoustic wave and detection of surface crack in steel

作者：Lin Bin^*; Zhang Lei; Dorantes Dante; Li Yanning; Fu Xing; Hu Xiaotang

来源：Transactions of Tianjin University, 2011, 17(4): 254-258.

DOI：10.1007/s12209-011-1616-2

• Displacement function
• Displacement load
• Propagation properties
• Surface acoustic wave
• Surface acoustic waves
• Surface cracks
• Time and frequency domains
• Transient dynamic analysis
• Two dimensional model
• Velocity dispersion
• Wide bandwidth
• Wide-band

The surface acoustic wave (SAW) propagating in a sample of steel is simulated by using finite element method (FEM). The waves are excited by a load function with propagation properties such as phase velocity dispersion and wide bandwidth. A two-dimensional model consisting of surface defects loaded with a wideband 50\-200 MHz and short time 0.1 μs displacement function is investigated in the time and frequency domains. By transient dynamic analysis, Fourier transform and dispersion calculation, snapshots of propagating wave and responses from sensing points are presented. It is indicated that this supervision approach is sensitive to the surface cracks and reflections.

• 出版日期2011
• 单位天津大学