炭素繊維強化複合材料円管[±45°]_4の引張り-圧縮疲労損傷と非弾性変形に対する応力比の影響

概要

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Fatigue tests of graphite/epoxy laminate tubes [ ± 45°]_4 were performed under tension-compression loading. The effects of stress ratio on the inelastic deformation under cyclic tension-compression are discussed. Cyclic stress-strain curves show viscoelastic-plastic behavior with cyclic hardening and softening, and are highly affected by the evolution of internal damage such as matrix cracking, delamination and fiber breakage. Development of matrix cracking and delamination causes an increase of the hysteresis loop width as the result of the decrease in the elastic modulus and the global stiffness. In particular, in the case of stress ratio R ( =σ_min/σ_max) < 0, salient and complex inelastic deformations were observed mainly due to the delamination and the resulting macroscopic buckling of the tubular specimens. The changes of energy dissipation per cycle and Young's modulus are found to reflect the change of the internal damage.
一般社団法人日本機械学会の論文
1994-01-25