Influence of elastic anisotropy on the fracture toughness of CFRP composites.

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  • ＣＦＲＰ複合材の破壊靭性に及ぼす異方性の影響
  • CFRP フクゴウザイ ノ ハカイ ジンセイ ニ オヨボス イホウセイ ノ エ

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Abstract

An analytical solution of the stress intensity factor for a double edge notched (DEN) specimen is first presented by using the two dimensional isotropic elasticity theory. Some approximate expressions, which have been widely used for the determination of the stress intensity factor, are compared with this solution in order to check their accuracy. Secondly, the influence of elastic anisotropy on the stress intensity factor of an orthotropic DEN specimen is examined within the framework of the two dimensional anisotopic elasticity theory. Lastly, the fracture toughness of plain weave fabric carbon fiber reinforced plastics (CFRP) is experimentally evaluated by taking into account their elastic anisotropy.

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