A simplified aggregate model is proposed which predicts the elastic con stants of short-fibre composites in any state of fibre orientation. The only material proper ties needed are two elastic constants for one known orientation state. In essence, this implies an interpolation of elastic properties between different orientation states of the same material. Engineering moduli and fibre orientation distributions of an injection moulded nylon/glass fibre composite are measured and predictions are made. Predicted and experimental moduli correlate excellently.
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