New approaches to quantifying tensile strength variability and size effects in unidirectional composites

Wisnom, Michael R. and Cantera, M. Asun and Czél, Gergely and Jalalvand, Meisam; Pipes, R. Byron and Yu, Wenbin and Goodsell, Johnathan, eds. (2017) New approaches to quantifying tensile strength variability and size effects in unidirectional composites. In: 32nd Technical Conference of the American Society for Composites 2017. Destech Publications, USA, pp. 2902-2909. ISBN 9781510853065

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    Abstract

    Two methods were used to investigate the variability of tensile failure strain of unidirectional high strength carbon/epoxy. Scaled tests on glass/carbon hybrid specimens showed a significant size effect and reduction of failure strain with stressed volume consistent with a Weibull modulus of 25. Ply fragmentation tests were also carried out, producing multiple carbon fractures in a single specimen. Strains from these tests also fitted a Weibull distribution, and gave a similar Weibull modulus to the scaled tests.