Meso-scale strain mapping in UD woven composites

Unidirectional (UD) woven laminates have complex tow geometry due to unbalanced weave architecture. Warp tows are held together by fine weft. Unit cell models for textile composites found in the literature are based on balanced weaves with identical warp and weft specifications. In this paper, unit...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2009-12, Vol.40 (12), p.1838-1845
Main Authors: Potluri, P., Young, R.J., Rashed, K., Manan, A., Shyng, Y.T.
Format: Article
Language:English
Subjects:
A. Aramid fibre
Applied sciences
B. Stress concentration
C. Micro-mechanics
E. Weaving
Exact sciences and technology
Forms of application and semi-finished materials
Laminates
Polymer industry, paints, wood
Technology of polymers
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Summary:Unidirectional (UD) woven laminates have complex tow geometry due to unbalanced weave architecture. Warp tows are held together by fine weft. Unit cell models for textile composites found in the literature are based on balanced weaves with identical warp and weft specifications. In this paper, unit cell geometry of unbalanced UD weaves has been considered. Unbalanced laminates have complex tow geometry with in-plane tow waviness and a significant overlap between adjacent tows. Main objective of this work is to measure full-field strain distribution at meso-scale or unit cell level and compare the results with FE analysis. Raman spectroscopy is a powerful technique for in situ strain measurement. A UD woven composite laminate with Kevlar fibres is used in this study, as Kevlar fibres exhibit clear Raman band shifts under strain. Influence of in-plane tow waviness on local strain gradients has been demonstrated.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2009.09.011