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Influence of 90°-layer thickness on damage initiation and propagation in CFRP cross-ply laminates
Publikationstyp
Conference Paper
Date Issued
2016-06
Sprache
English
TORE-URI
Citation
European Conference on Composite Materials (ECCM): (2016-06)
Contribution to Conference
The influence of layer thickness on failure initiation and damage propagation as matrix cracks in the 90°-layers of cross-ply laminates is investigated experimentally and simulated by using FEM. Decreasing the 90°-layer thickness leads to a shift of damage initiation to higher loads. The crack density and the shape of inter fibre failure also depend on the layer thickness. With increasing 90°-layer thickness, the total amount of cracks decreases, whereas the amount of cracks running through the layer thickness and through the whole specimen width increases. Cracks exhibit a faster growth rate and larger crack opening with increasing layer thickness. This case is more severe for initiating delaminations. A reduction of ply thickness in cross-ply laminates increases the resistance against inter-fibre-fracture and thus offer great potential for increased fatigue lifetime.
Subjects
Acoustic emission analysis
Cross-ply
Finite element method (FEM)
Micromechanics
Ply thickness