4.7 Article

Experimental investigation, using 3D digital image correlation, into the effect of component geometry on the wrinkling behaviour and the wrinkling mechanisms of a biaxial NCF during preforming

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.106248

关键词

Fabrics/textiles; Defects; Preforming; Resin Transfer Moulding (RTM)

资金

  1. Engineering and Physical Sciences Research Council, via an EPSRC Doctoral Training Partnership (DTP) studentship [RG80792, RG84040]
  2. Engineering and Physical Sciences Research Council, EPSRC Future Composites Manufacturing Research Hub [EP/P006701/1]
  3. EPSRC [EP/P006701/1, 1946941] Funding Source: UKRI

向作者/读者索取更多资源

This study investigates the effect of component geometry on the wrinkling mechanisms of non-crimp fabrics during preforming, revealing the significant impact of geometry on wrinkle severity and the existence of two possible wrinkling mechanisms. Additionally, the increase in local shear resistance and textile compression are shown to be related to fabric wrinkles.
This study investigates the effect of component geometry on the wrinkling mechanisms of non-crimp fabrics (NCFs) during preforming. Using 3D digital image correlation, the wrinkling behaviour of a biaxial NCF formed over four benchmark geometries is characterised and related to the NCF's surface strains. It is shown that the effect of geometry on the severity of wrinkling is highly significant and that there are two possible wrinkling mechanisms (via shear lockup or via compression) for large wrinkles to occur, which are consistent across geometries. Importantly, an increase in local shear resistance (due to the stitches in this case) is shown to cause severe wrinkles in textile reinforcements at low shear angles due to lateral fabric compression. Additionally, tow wrinkling in NCFs is shown to correlate with local tow compression. Thus, it is not always valid to assume that fabrics are only likely to wrinkle during forming due to excessive shearing.

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