Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2019 - September 11, 2019
The delamination fatigue crack growth tests of CFRP laminates were performed under modeI, modeII, and mixedmodeI+II cyclic loading. The laminate configuration was [020/9020/020] and the fatigue crack was grown along the boundary between 0°ply and 90°ply. During the tests, AE signals were recorded, in order to investigate the AE signal characteristics under the each mode cracking. The relationship between the crack growth rate da/dN and energy release rate range (ΔGI, ΔGII and ΔGI+II) were given by a power law in the region of da/dN tested. The duration of AE event under the modeI loading tend to be longer than that under the other mode. Wavelet analysis of AE signals shown that the intensity of frequency components at about 200 kHz tends to be high under the modeII loading. This suggests that the fiber-resin interface cracking was occurred frequently.
