期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 103, 期 -, 页码 168-177出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2017.10.008
关键词
Polymer-matrix composites (PMCs); Defects; Forming; Prepreg processing
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Composites Research Network (The Boeing Company)
- Composites Research Network (Convergent Manufacturing Technologies)
- Composites Research Network (Toray Americas)
- Composites Research Network (Avcorp Industries)
Fiber misalignment in composites in the form of in-plane waviness and out of-plane wrinkling, is a major defect arising from processes such as hot drape forming. This work studies the micro-level mechanisms of forming in-plane fiber waviness and out-of-plane wrinkling. An out-of-autoclave unidirectional prepreg system by SOLVAY (CYTEC), CYCOM 5320/T650-35 was used to conduct multiple forming experiments and study the effects of various parameters including forming temperate and lay-up sequence. The effect of partial impregnation, or 'Engineered Vacuum Channels', in out-of-autoclave prepreg systems on the intra-ply separation/slippage and consequently fiber misalignment was studied and found to be a significant contributor to micro-level mechanisms. Cross sectioning and microscopy of the parts and examination of the end termination profiles were used to analyze the effect of forming parameters on ply end-shortening and consequently fiber misalignment. (C) 2017 Elsevier Ltd. All rights reserved.
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