Abstract：Based on the theory of plane strain and the equations of dynamic equilibrium in the frequency domain,a finite element model for simulating laser-generated Rayleigh waves on the viscoelastic plate was developed.The effects of material viscoelasticity on the characteristic of Rayleigh waves were analyzed.The interactive process of reflection and mode-conversion of the Rayleigh waves on the surface-breaking crack of the viscoelastic plate was simulated in detail.Moreover,the position and depth of the surface-breaking crack were calculated.The numerical results show that the reflected Rayleigh waves have two components through the reflection of the laser-generated Rayleigh waves.The physical mechanism of the reflected waves RR and RS can be used to detect the position and depth of the surface-breaking crack.The study provides theoretical basis for detecting the surface-breaking crack on the viscoelastic material quantitatively.
2010, Vol. 31 
