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Item type:Publication, Access status: without files , Influence of 90°-layer thickness on damage initiation and propagation in CFRP cross-ply laminatesThe 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.Publicationtype: Conference Paper52 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Influence of ply thickness on the fibre matrix debonding(2015-07); ; ; In this work, the influence of ply thickness in the 90° layer in cross-ply laminates on the initiation of fibre matrix debonding and inter-fibre-fracture under tensile loads is investigated experimentally by using model composites as well as in a FEM simulation. Decreasing the ply thickness leads to a shift of the onset of inter-fibre-fracture to higher loads. The failure propagation at higher loads is less severe with decreasing layer thickness. Explanations for this behaviour like the probability of a critical defect in the reduced volume or the in-situ effect are discussed. The FEM model is able to represent the ply thickness effect and simulation results are qualitatively in good agreement with the experiments. In the simulation, first fibre-matrix-debonding was found at higher global strain and matrix cracks were more but less severe for thinner plies, whereas an earlier damage onset and fewer cracks, running through the whole layer thickness are found for thicker layers. A reduction of ply thickness in cross-ply laminates increases the resistance against inter-fibre-fracture and failure propagation.Publicationtype: Conference Paper27