Abstract
In this paper, the propagation behavior of elastic waves generated in CFRP laminates by pulsed laser was investigated both experimentally and analytically. First, the anisotropy in amplitudes of elastic waves generated by pulsed laser were measured experimentally. The anisotropic property was found to vary with different frequencies. Secondly, elastic wave propagation behavior was evaluated by finite element analysis. In this analysis, two cases in which CFRP has anisotropic and isotropic thermal expansion properties were compared with experimental results. As a result, tendency in analytical results of CFRP with anisotropic thermal property agreed well with the experimental results, which confirms that the anisotropic thermal expansion property of CFRP laminates causes the anisotropy in amplitudes of elastic waves generated in CFRP laminates by pulsed laser. Finally, the influence of coatings on anisotropic behavior of elastic waves generated in CFRP laminates by pulsed laser was investigated by wave measurement test of CFRP specimens with coatings used for outer skins of aircrafts.
