Paper number 362
|EFFECTS OF TEST CONDITIONS ON MODE II INTERLAMINAR FRACTURE TOUGHNESS OF FOUR-POINT ENF SPECIMENS|
Kazuro Kageyama1, Isao Kimpara1, Toshio Suzuki1, Isamu Ohsawa1, Makoto Kanai1 and Hitosh Tsuno1
1Department of Environmental and Ocean Engineering, University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
|Summary||Mode II interlaminar fracture toughness of laminated composites has risen importance to design criteria and material selections for advanced composite structures. Recently, Martin and Davidson have proposed four-point ENF (4ENF) test, which requires no special control system or complex loading fixture. In the present paper, effects of test conditions, such as specimen dimensions, loading conditions, friction between delamination surfaces, and data reduction methods on Mode II interlaminar fracture toughness at initiation and during delamination growth have been discussed by experimentally and theoretically. An improved test procedure and new data reduction method have been proposed based on the results and discussions. The 4ENF test has been considered one of the candidates of international standard test method for Mode II interlaminar fracture toughness.
||Keywords|| interlaminar fracture toughness, delamination, mode II, 4 points ENF, energy release rate, friction, standardization.
Theme : Mechanical and Physical Properties ; Fracture Mechanics and Failure
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