Damage Prognosis for Delamination of a Composite Plate
Аннотация
The objective of this paper is to investigate computationally the growth of internal delaminations in composite plates subjected to cyclic compression. Under compressive loading, these structures experience repeated buckling-unloading of the delaminated layer with a consequent reduction of interlayer resistance. The state of stress near the delamination tip is of mixed mode I and II. The thin film model of Chai et al. (1991) which is a closed-form solution for the initial post-buckling and growth behaviour in the ideal case of delamination in an infinitely thick plate has been used and a graphite-epoxy unidirectional specimen is studied. The delamination growth law considered is the one proposed by Kardomateas et al. (1995). While the study starts from a simplified model, the parameters of the growth law are uncertain and an approach based on interval arithmetic is adopted to investigate the effect of the parameter uncertainty on theoretical prediction of the delamination growth of the laminate.