Moisture absorption in glass-fibre/epoxy laminates with transverse matrix cracks
1999 (English)In: Composites Science And Technology, ISSN 0266-3538, Vol. 59, no 13, 1983-1991 p.Article in journal (Refereed) Published
Moisture uptake in cross-ply glass-fibre/epoxy laminates containing matrix cracks in transverse plies has been investigated. Experimental results are compared to finite-element calculations and an approximate analytical model. The experimental results show that crack closure may occur early in the absorption process. This is confirmed by finite-element calculations which indicate that even small amounts of absorbed moisture (average moisture concentration < 10% of saturation level) may result in crack closure. As a result of crack closure, moisture penetration through the crack channels is prevented. The experimentally observed small differences in moisture uptake between cracked and uncracked laminates thus support the crack-closure hypothesis. Direct microscopic observations of crack closure versus time furthermore confirm the mechanism. A previously developed analytical model has been extended to include the case of crack-closure effects. The model compares favourably with experimental observations.
Place, publisher, year, edition, pages
1999. Vol. 59, no 13, 1983-1991 p.
polymer-matrix composites (PMCs), hygrothermal effect, matrix cracking, damage mechanics, transverse cracking
Mechanical Engineering Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-25455DOI: 10.1016/S0266-3538(99)00055-XISI: 000082862700005OAI: oai:DiVA.org:kth-25455DiVA: diva2:358520
QC 201010222010-10-222010-10-222010-10-22Bibliographically approved