|Title: Influence of 90°-layer thickness on damage initiation and propagation in cfrp cross-ply laminates|
|Written by: Leopold, C. and Harder, S. and Buggisch, C. and Liebig, W. and Fiedler, B.|
|in: 17th European Conference on Composite Materials (ECCM17) 2016|
Abstract: 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.