期刊
COMPOSITE STRUCTURES
卷 173, 期 -, 页码 188-195出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2017.04.019
关键词
Polymer-matrix composites (PMCs); Fracture; Fracture toughness; Damage mechanics
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
A combined experimental and numerical approach is presented to calibrate the parameters of a previously developed nonlocal damage model used to simulate the inelastic response of laminated composites within a macroscopic modelling framework. In this approach, a limited number of physically-based damage parameters are obtained by conducting tests on notched specimens while employing the Digital Image Correlation (DIC) technique. These parameters are then used to calibrate a non-local sub laminate based damage mechanics model, CODAM2. Compared to available ply-based approaches; the sub-laminate damage model reduces the computational time significantly while capturing the overall damage behaviour of the laminate. The damage model is implemented as a built-in material model in the commercial finite element code, LS-DYNA (MAT_219) and also in the open-source object oriented finite element code, OOFEM. To validate this approach, experiments were conducted on notched tensile specimens with varying notch-tip radii that result in a range of behaviour from stable to unstable damage growth as this radius increases. The calibrated damage model was used to predict this transition. (C) 2017 Elsevier Ltd. All rights reserved.
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