Local Delamination Buckling of a Laminated Beam Due to Three-Point Bending

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  • 三点曲げを受ける異種材積層はりのはく離の局所座屈
  • 211 三点曲げによる積層はり内部はく離の局所座屈
  • サンテンマゲ オ ウケル イシュザイ セキソウハリ ノ ハクリ ノ キョクショ ザクツ
  • 211 サンテンマゲ ニヨル セキソウハリ ナイブ ハクリ ノ キョクショ ザクツ

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Asymmetric three-point bending of a layered beam containing an interior interface crack is analyzed on the basis of classical beam theory. The point of load application is assumed to lie on the delaminated part, so that a part of the crack faces is contacting one another, while the remaining part of the crack faces is open. Axial compressive and tensile forces are induced by bending in the parts of the beam above and below the delamination and they are determined by modeling the cracked part as two lapped beams hinged at both ends. When the magnitude of the applied load is small, the beam deflects retaining mutual contact of whole crack faces, but as the applied load reaches a critical value, local delamination buckling occurs. The relation between the magnitude of the applied load and the deflection at the point of load application is found to be nearly bilinear. The validity of this prediction is confirmed by experiments. It is also shown that once the delamination buckling occurs, energy release rate generally becomes larger as compared with the case of perfect contact of delaminated surfaces.

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