The tensile strength of unidirectional carbon fiber-reinforced plastic (CFRP) composites was predicted by numerical simulation plus size scaling. The fiber strength distribution used in the numerical simulation was determined from the fragmentation process in a single fiber composite.
Since the experimental data obviously did not fit the normal Weibull distribution, we fitted them with the Weibull of Weibull model, considering the statistical distribution of scale parameters of fiber strength in the normal Weibull model. Moreover, the constitutive law of the matrix was
derived from the stress–strain curves of the angle ply laminates, utilizing the micromechanics approach proposed by Tohgo et al. . Based on these parameters, we simulated the tensile fracture of unidirectional CFRP composites with the spring element model (SEM). The predicted
tensile strength by numerical simulation plus size scaling agreed well with the experimental data. The results also confirmed that the Weibull of Weibull model is important to predict size-dependent composite strength.
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SPRING ELEMENT MODEL;
Document Type: Research Article
Department of Aerospace Engineering, Tohoku University, 6-6-01 Aoba-yama, Aoba-ku, Sendai 980-8579, Japan
Airframe Section, Engineering Department, Japan Airlines International, Japan
Department of Nanomechanics, Tohoku University, Japan
Department of Advanced Energy, The University of Tokyo, Japan
Publication date: 2010-06-01