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Experimental and numerical investigation on three‐point bending behaviors of unidirectional warp‐knitted composites
Author(s) -
Hong Yang,
Yan Ying,
Guo Fangliang,
Li Jie,
Tian Ziyang
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48132
Subject(s) - materials science , composite material , bending , flexural strength , shear (geology) , nonlinear system , three point flexural test , span (engineering) , computer simulation , structural engineering , mechanics , physics , engineering , quantum mechanics
This study develops a novel specimen model, which considers the progressive damage of the layers, the knitting yarns, and the interlaminar cohesive zone, to investigate the flexural properties and the interlaminar shear properties of the unidirectional warp‐knitted composites. Three‐point bending tests are conducted as verification of the numerical model. Improved strain‐based Hashin criteria are proposed to analyze the shear nonlinearity. Results show that specimens with small span‐to‐thickness ratios exhibit obvious nonlinear behaviors and the corresponding simulation results are sensitive to the value of the shear nonlinear factor. Failure mechanism and stress distributions are analyzed based on numerical simulations. The effect of the specimen size on bending behaviors is discussed. The influence of the width is found to be negligible but that of the span‐to‐thickness ratio is significant. The ranges of the span‐to‐thickness ratio corresponding to different failure modes are given. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48132.