DCB test simulation of stitched CFRP laminates using interlaminar tension test results |
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Authors: | Yutaka Iwahori Kozue Nakane Naoyuki Watanabe |
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Affiliation: | 1. Composite Technology Center, Japan Aerospace Exploration Agency, 6-13-1 Osawa, Mitaka-shi, 181-0015 Tokyo, Japan;2. Department of Aerospace Engineering, Faculty of System Design, Tokyo Metropolitan University, Japan |
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Abstract: | A simulation model for the delamination extension of stitched CFRP laminates and 3-D orthogonal interlocked fabric composites (3-D OIFC) has been developed using a 2-D finite element method incorporating interlaminar tension test results to simulate the experimental results of their DCB tests. The mechanical properties of through-the-thickness fiber were determined from the results of interlaminar tension tests in which the specimen included only one through-the-thickness yarn. The fracture phenomena around the through-the-thickness thread, such as debonding from the in-plane layer, slack absorption, fiber bridging, and the pull-out of broken threads from the in-plane layers, are also introduced into the FEM model. The present FEM simulation results were compared to DCB test results for certain stitched laminates and a 3-D OIFC, and the simulation results showed good agreement with the experimental results of DCB tests, including the load–displacement curve and Mode I strain energy release rate (GI). While it was difficult to estimate GI accurately when the DCB test specimen included different types of z-fiber fracture modes, the present model of FEM analysis can simulate the experimental results of DCB tests of stitched laminates and 3-D OIFC. It is suggested that the GI of CFRP with arbitrary z-fiber densities can be predicted by using this FEM analysis model together with interlaminar tension test results. |
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Keywords: | A. Fabrics/textiles B. Delamination B. Fracture toughness C. Crack Stitching |
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