Compressive fracture of layered composites caused by internal instability

Guz, I. A.; Menshykova, Marina; Soutis, C.

doi:10.1016/b978-0-08-100137-0.00018-3

Cited by 1 publication

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References 60 publications

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“…In combination with findings of failure initiation, as shown in figure 11 and presented in [8], equation (3.2) leads to a minimum in compressive strength η ≈ 50% for half-embedded fibres. As observed in experimental studies for model composites at the micro-and meso-scale levels, the failure initiation is caused by fibre-matrix debonding [32][33][34], which could be pushed by fibre misalignment, followed by kink-band formation [8,26]. This leads to the assumption that the foundation (fibre-matrix bond) dominates the failure process.…”

Section: (B) Compressive Failure In the Presence Of Voidsmentioning

confidence: 92%

Hierarchical analysis of the degradation of fibre-reinforced polymers under the presence of void imperfections

Liebig

Schulte

Fiedler³

2016

Phil. Trans. R. Soc. A.

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The subject of this work is the investigation of the influence of voids on the mechanical properties of fibre-reinforced polymers (FRPs) under compression loading. To specify the damage accumulation of FRPs in the presence of voids, the complex threedimensional structure of the composite including voids was analysed and a reduced mechanical model composite was derived. The hierarchical analysis of the model composite on a micro-scale level implies the description of the stress and strain behaviour of the matrix using the photoelasticity technique and digital image correlation technology. These studies are presented along with an analytical examination of the stability of a single fibre. As a result of the experimental and analytical studies, the stiffness of the matrix and fibre as well as their bonding, the initial fibre orientation and the fibre diameter have the highest impact on the failure initiation. All these facts lead to a premature fibre-matrix debonding with ongoing loss of stability of the fibre and followed by kink-band formation. Additional studies on the mesoscale of transparent glass FRPs including a unique void showed that the experiments carried out on the model composites could be transferred to real composites.

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