二重端面切欠き引張試験による複合材料積層板のモードII層間破壊じん性評価法の提案と検証

Translated title of the contribution: New Test Method for Mode II Interlaminar Fracture Toughness of Composite Laminates: Doubly End-Notched Tension Method

矢代 茂樹, 安形 俊秀, 吉村 彰記

Research output: Contribution to journalArticle

Abstract

<p>This study proposed and validated a new method to evaluate the mode II interlaminar fracture toughness both at the initial delamination onset and during the crack growth stage by using a doubly end-notched tension (DENT) specimen. The specimen configuration idealized the growth of two mode II cracks in a double-lap joint. Shear-lag analysis indicated that the energy release rate of the DENT specimen is independent of the crack length and that the crack growth is stable. The initial mode II fracture toughness obtained by quasi-static tensile tests of the proposed specimens largely agreed with that obtained by the end notched flexure (ENF) tests. This trend was also valid in the other CFRP unidirectional laminates with different Young's moduli. Furthermore, the present study demonstrated that the crack growth resistance curve (R-curve) of mode II delamination could be obtained by unloading-reloading tests of the proposed specimens.</p>
Original languageJapanese
Pages (from-to)19-24
Number of pages6
Journal日本複合材料学会誌
Volume44
Issue number1
DOIs
Publication statusPublished - 2018

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Laminates
Fracture toughness
Crack propagation
Delamination
Composite materials
Cracks
Energy release rate
Carbon fiber reinforced plastics
Unloading
Elastic moduli

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二重端面切欠き引張試験による複合材料積層板のモードII層間破壊じん性評価法の提案と検証. / 矢代茂樹; 安形俊秀; 吉村彰記.

In: 日本複合材料学会誌, Vol. 44, No. 1, 2018, p. 19-24.

Research output: Contribution to journalArticle

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AB - This study proposed and validated a new method to evaluate the mode II interlaminar fracture toughness both at the initial delamination onset and during the crack growth stage by using a doubly end-notched tension (DENT) specimen. The specimen configuration idealized the growth of two mode II cracks in a double-lap joint. Shear-lag analysis indicated that the energy release rate of the DENT specimen is independent of the crack length and that the crack growth is stable. The initial mode II fracture toughness obtained by quasi-static tensile tests of the proposed specimens largely agreed with that obtained by the end notched flexure (ENF) tests. This trend was also valid in the other CFRP unidirectional laminates with different Young's moduli. Furthermore, the present study demonstrated that the crack growth resistance curve (R-curve) of mode II delamination could be obtained by unloading-reloading tests of the proposed specimens.

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