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- Varna, Janis, et al.
(författare)
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Effect of voids on failure mechanisms in RTM laminates
- 1995
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Ingår i: Composites Science And Technology. - : Elsevier BV. - 0266-3538 .- 1879-1050. ; 53:2, s. 241-249
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Tidskriftsartikel (refereegranskat)abstract
- Most studies on the effects of voids aim for determination of the relationship between void content and the fracture property of interest. The effect of voids on the mechanisms of transverse failure was therefore investigated for predominantly unidirectional resin transfer moulded laminates of glass-fibre-fabric/vinylester. Laminates with the highest average content of voids had a transverse strain to failure as high as 2% whereas low void content laminates failed at 0.3%. Only a few large and well-defined transverse cracks formed in low void content laminates before final failure. Multiple transverse cracks with irregular shape as well as numerous smaller cracks formed in the high void content laminates. The irregularity of these cracks resulted in lower stress concentration and stress level in the small amount of weft bundles orientated in the loading direction. A simple model was developed in order to demonstrate this and explain the high strain to failure of high void content laminates.
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