期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 91, 期 -, 页码 156-167出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2016.09.016
关键词
Fabrics/textiles; Defect; Finite element analysis (FEA); Forming; Preform
资金
- Innovate UK [101879]
- Innovate UK [101879] Funding Source: UKRI
To capture the asymmetrical shear behaviour of a bi-axial NCF with a pillar stitch, a non-orthogonal constitutive model was developed and implemented in finite element forming simulations. Preforming experiments indicate that the local distribution of defects is significantly different on both sides of each bi-axial ply, with two different defect mechanisms observed. Correlation with simulation results indicates thatone defect type is caused by excessive shear, inducing out-of-plane wrinkling in regions of positive shear (macro-scale wrinkling). The other defect type is caused by fibre compression, inducing in plane wrinkling in regions of negative shear (meso-scale wriniding). Local distributions of shear angle and wrinkling strain were used to determine the wrinkling mode and to confirm the corresponding defect mechanism. Results indicate that simulations based on the advanced constitutive model can predict local shear angles within 5 of experimental values and that predicted wrinkling positions and defect types correlate well with the experiments. (C) 2016 Elsevier Ltd. All rights reserved.
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