Off-Axis Notched Strength of Fiber Metal Laminate and Its Modeling

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  • KAWAI Masamichi
    Department of Engineering Mechanics and Energy, University of Tsukuba
  • ARAI Yuya
    Department of Engineering Mechanics and Energy, University of Tsukuba

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  • ファイバーメタル積層板の非主軸切欠強度とそのモデル化
  • ファイバーメタル セキソウバン ノ ヒシュジク キリカキ キョウド ト ソノ モデルカ

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Abstract

The effects of notch size and fiber orientation on the off-axis notched strength of the fiber metal laminate GLARE-3 are examined. Static tension tests are performed on unnotched and notched (center open hole) specimens with different fiber orientations for these ends. It is clearly observed that the notched strength of GLARE-3 exhibits not only notch size dependence but also fiber orientation dependence. A new and efficient failure criterion for the tensile failure of notched orthotropic materials for any notch size and for any multiaxial state of stress is developed. It is formulated by combining a net section stress criterion with a fracture mechanics based criterion for a Griffith crack so that prediction of any notch sensitivity bounded by the notch sensitive and insensitive limits is allowed. From the proposed multiaxial failure criterion for notched orthotropic materials, an analytical formula for predicting the off-axis notched strength of orthotropic laminates is also derived. This formula reveals that the proposed failure criterion is characterized by a new concept of the principal normalized fracture toughness (or the concept of the principal stress brittleness numbers) of a given orthotropic material. It is demonstrated that the off-axis notched strength of GLARE-3 can accurately be predicted by the proposed failure criterion, regardless of the notch size and fiber orientation.

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