CF/Epoxy積層板のモードI層間/層内疲労き裂進展抵抗のき裂長さ依存性に関する検討

Abstract

Crack length dependencies of intralaminar and interlaminar crack growth resistances were evaluated under static and fatigue loadings for CF/Epoxy laminates. The crack length dependency for intralaminar crack growth was more significant than that for interlaminar crack growth due to larger amount of bridging fibres. On the other hand, there was no significant difference in stress shielding effect derived from bridging fibres at a crack tip under static and fatigue loadings for both interlaminar and intralaminar crack growths. Then, the mechanism of the formation of fibre bridging is different from that for CF/PEEK where the difference between static and fatigue was clear. Fracture surface observations reveal that plastic deformation of matrix resin and damaged zone size are probably the key factors for the different stress shielding effect between for static and fatigue loadings.