Simulation of guided wave under varying temperature and load conditions

Guided wave-based damage evaluation has been regarded as a promising method in the area of structural health monitoring. The main obstacle for the practical application of these guided wave-based monitoring methods is the reliability of damage evaluation under time-varying ambient conditions. In this paper, an analytical model and a semi-analytical finite element (SAFE) method are proposed to study the effect of temperature and load on guided wave propagation in an isotropic plate respectively including the dispersion curves and waveform. In the presented models, the temperature and load dependent elastic constants are considered to study the variations of guided wave properties. The result shows that the phase velocity gradually decreases with the incremental temperature. It is also observed that the phase velocity gradually decreases with the incremental load. Finally, the analytical model and SAFE method are validated through the experimental data. It shows that the results obtained from the theoretical model match well with the experimental results.