抄録
Carbon fiber reinforced plastic (hereinafter referred to as CFRP) has excellent characteristics, so application to aerospace and automotive fields and the like is increasingly in full swing today. However, as compared with structural materials such as aluminum alloys, the damaged form is complicated, and it is important to correctly estimate the strength reduction and structural strength reliability due to the introduction of damage. Therefore, in this study, we investigated how the natural frequency and the loss coefficient of the CFRP orthogonally symmetrical laminated material are changed by introducing in-layer resin cracking damage by measuring the mechanical impedance by the central vibration tests.
