Influence of Form of Reinforcement on Spread of Strength in FRP

Taichi FUJII, Zenichiro MAEKAWA
1978 Journal of the Society of Materials Science Japan  
The fiber reinforced composites are generally characterized by a considerable spread in mechanical properties, since the variabilities in these materials, which are composed of dispersed phase and matrix phase, are considered to be not only dependent upon the properties of each phase but also upon the interface formed between two phases. Random fiber composites reinforced with chopped strand mat show complex failure behaviors and the prediction of their static strength is considered to be a
more » ... sidered to be a perplexing problem. The main results obtained in the present study using the strength analysis based on the reliability concept are summarized as follows: (1) The static strength distribution of random fiber composites can be described by Weibull and double exponential distributions under the assumption that laminate is an aggregate of cross sectional layers in series and the weakest link theory can be applied to the specimen. (2) The cross sectional layer is modeled as a quasi-isotropic laminate consisting of unidirectional plies. Three possible failure mechanisms of layer are obtained by the combination of the failures parallel and perpendicular to the fiber direction and the failure in shear, and each failure type proves to be dependent upon the fiber content of laminate. The mean value and the spread of the strength of cross sectional layers can be calculated.
doi:10.2472/jsms.27.754 fatcat:lyqbpz2nl5bgjaksqd4z5nloze