炭素繊維強化積層複合材料のモードI層間はく離試験における破壊靱性挙動

概要

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Fracture behaviors in mode I delamination tests of CFRP (T 300/2500) were studied at crosshead velocity V=0.005〜200mm/min. In low velocity regions, serrations due to repeated intermittent unstable crack extnsions appear on load P-displacement δ relations, and they become conspicuous as V becomes smaller. The crack resistance force R evaluated using the peak values of the serrated P-δ relation becomes larger with the decrease of V ; the rate dependence of R is negative (dR/dV<0). On the other hand, at velocities higher than the critical one (Vc), there are nothing but fluctuations on P-δ relations. Although the rate dependence of R is extremely small, it is a positive value (dR/dV>0). Relaxation tests were also performed for specimens deformed at lower or higher velocities than V_c ; at high velocity, load P decreases with time, while at low velocity, the load remains constant during the relaxation test. The rate dependence and fracture behaviors have been discussed using a model which takes the crack tip blunting effect into account.
一般社団法人日本機械学会の論文
1997-05-25