Relaxation of Process-Induced Stresses in Composite Parts – Mixed Experimental-Numerical Approach
made of carbon/epoxy unidirectional prepreg by a numerical simulation. The results of the simulation are verified by the comparison of the calculated and measured deformations of a composite part. Since the composite materials exhibit viscoelastic behaviour, some of the process-induced stresses in composite parts may be relaxed during exploitation of the part, which may lead to the decrease of the undesired process-induced stresses. Therefore, a user defined viscoelastic-orthotropic material model was developed in order to take into account the stress relaxation. Such an approach allowed to evaluate the process-induced stress level in composite parts during exploitation without difficult and time-consuming experiments.
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