Journal
POLYMER TESTING
Volume 60, Issue -, Pages 307-320Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2017.04.010
Keywords
Plain woven composite; Off-axis and biaxial tests; Tensile strength; Failure criteria; Fracture modes
Funding
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Innovation Program for Graduate Education [KYLX_0222]
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An experimental study was focused on investigation of the failure properties of plain woven glass/epoxy composites under off-axis and biaxial tension loading conditions. Four fibre orientations (0 degrees, 15 degrees, 30 degrees and 45 degrees with respect to the load direction) were considered for off-axis tests and two biaxial load ratios for biaxial tests to study failure characteristics and mechanism, Four classical polynomial failure criteria Tsai-Hill, Hoffman, Tsai-Wu and Yeh-Stratton-were analysed comparatively to predict off-axis and biaxial failure strength of the composites. For failure prediction of the plain woven composites under multiaxial tension loads, the Tsai-Wu criterion was modified by introducing an interaction coefficient F12 obtained from 45 degrees off-axis or biaxial tension tests and the Yeh-Stratton criterion was modified with the interaction coefficient B-12 = 0 or obtained from the biaxial tension test. The former criterion was found to have higher accuracy. Finally, according to macroscopic and microscopic studies, the failed specimens showed mostly distinct failure with a specific fracture orientation, mainly exhibiting fibre or fabric tensile fracture mode and a combination of matrix cracking and delamination, both in off-axis and cruciform samples. (C) 2017 Elsevier Ltd. All rights reserved.
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