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Fibre misalignments in the split-disk test represented by random fields
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DOI：10.1016/j.compositesb.2024.111768.png)
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Abstract
En 中文
Fibre misalignment is a major type of manufacturing defect in fibre-reinforced composite materials which has an adverse effect on the mechanical performance of composites. The present paper utilises stochastic models based on the random fields of fibre misalignment in the finite element analysis (FEA) of the split-disk test for filament wound composites. Local fibre misalignment characteristics are determined experimentally using X-ray microcomputed tomography (mu-CT) and then used to generate spatially correlated anisotropic random fields further mapped to finite element mechanical properties. The model predicts pronounced stress and strain nonhomogeneity, an expected reduction in the overall modulus and pre-mature damage initiation. This leads to the evaluation of effect-of-defects and allowable for manufacturing tolerances in hoop layers of composite pressure vessels.
Keywords:
Finite element analysis
Split-disk test
Fibre misalignment
Random fields
Autocorrelation