Residual stresses in non-symmetrical carbon/epoxy laminates


Wijskamp, S. and Akkerman, R. and Lamers, E.A.D. (2003) Residual stresses in non-symmetrical carbon/epoxy laminates. In: ICCM 14, International conference on composites: Bridging the Gap Between Academia and Industry,, July 14-18, 2003, San Diego, California.

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Abstract:The curvature of unsymmetrical [0/90] laminates moulded from AS4/8552 uni-directional tape has been measured. A linear thermoelastic approach has been applied to predict the related residual stress state before demoulding, giving an estimate of the stress induced by polymerisation strain. The results from the linear approach are confirmed by a viscoelastic finite element model including the cure conversion and related change in viscosity. It is concluded that the curvature measurement of unsymmetrical laminates is an accurate method for the prediction of the transverse residual stress, making it suitable as a benchmark for complex stress modelling.
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Engineering Technology (CTW)
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