The compressive strength of unidirectionally or layer-wise reinforced composite materials in direction parallel to their reinforcement is limited by micro-buckling instabilities. Although the inherent compressive strength of a given material micro-structure can easily be determined by assessing its stability under a uniform compressive load, this is often not suffcient for predicting failure initiation within a larger structure. In cases, where the composite material micro-structure is locally subjected to strongly non-uniform loadings, compressive instabilities depend not only on the maximum compressive stress but also on spatial stress or strain gradients, rendering failure initiation size scale dependent. The present work demonstrates and investigates the aforementioned effect through numerical simulations of periodically layered structures withnotches and holes under bending and compressive loads, respectively. The presented results emphasize the importance of the reinforcing layer thickness on the load carrying capacity of the investigated structures, at a constant volumetric fraction of the reinforcement. The observed strengthening at higher values of the relative layer thickness is attributed to the bending stiffnessof the reinforcing layers.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Number of pages||7|
|Publication status||Published - 2016|
|Event||37th Risø International Symposium on Materials Science: Understanding performance of composite materials – mechanisms controlling properties - Risø Campus, Roskilde, Denmark|
Duration: 5 Sep 2016 → 8 Sep 2016
|Conference||37th Risø International Symposium on Materials Science|
|Period||05/09/2016 → 08/09/2016|
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Published under licence by IOP Publishing Ltd