一方向炭素繊維強化熱可塑性プラスチックスの高温疲労層間はく離き裂伝ぱ

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Behavior of delamination crack growth in a carbon fiber reinforced plastic (CFRP) was investigated under static creep, two step creep and high temperature fatigue at 473K (200℃) using DCB specimens. The material was a unidirectional laminate. APC-2, which consists of carbon fibers, AS4, and a thermoplastic polymer, poly-ether-ether-ketoned (PEEK). In the static and two step creep tests, the crack propagation rate against time, dl/dt, was governed by the energy release rate, G, regardless of the stress change. The crack propagation in high temperature fatigue was classified into timedependent and cylcle-dependent ones. In the former, the propagation rate against time, dl/dt, was correlated well with the energy release rate, G, and the relationship coincided with that in static creep (dl/dt=C_cG^<mc>; C_c and m_c are material constants.). In the latter, the rate against load cycles, dl/dN, was controlled by the energy release rate range, ΔG(dl/dN=C_fΔG^<mf>; C_f and m_f are material constants.). These imply that the crack grew under the small scale creep and small scale yielding condition, respectively. The condition of transition from the time-dependent crack propagation to the cycle-dependent one was given by a relationship, C_c ∫^<t1>_0 G^<mc>dt=C_ΔG^<mf>, where t_1 is cycle period.The fracture surface in the time-dependent ffatigue was characterized by the interface cracking between fibers and matrices. On the other hand, the matrix cracking near the fiber dominated in the cycle-dependent fatigue.
1993-01-15

一方向炭素繊維強化熱可塑性プラスチックスの高温疲労層間はく離き裂伝ぱ

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