Abstract
In this study, several different lengths of delamination and transverse crack densities were introduced into carbon fiber reinforced plastic (CFRP) simply-supported beams and then their vibration and damping properties were evaluated. The experimental measurements shows that the bending mode frequencies decrease when delamination is introduced in the specimens. On the other hand, their modal damping ratio increased. Also, the effect of transverse crack densities showed the increase of modal damping ratio. However, the bending mode frequencies are found to be insensible to the cracks. These results snowed that there was able to estimate measurement of damage from the bending mode frequencies and modal damping ratio.
