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 (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 Inc., 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.