Determination of pure mode-I fracture toughness of multidirectional composite DCB specimens

Published on Jul 1, 2021in Engineering Fracture Mechanics3.426
· DOI :10.1016/J.ENGFRACMECH.2021.107776
Ruodi Jia (University of Toulouse), Libin Zhao21
Estimated H-index: 21
(Beihang University),
Xiaojing Gong1
Estimated H-index: 1
(University of Toulouse)
Sources
Abstract
Abstract Strain energy release rate (SERR) along a linear crack front of a multidirectional composite DCB specimen shows an obviously non-uniform distribution, which causes the fracture toughness GIavg measured by experiments smaller than the real GIC, and so leading to a lower estimation of fracture toughness. In this study, based on the numerical model a novel semi-empirical closed-form formula was proposed for determination of pure mode I fracture toughness of a multidirectional composite DCB specimen via a width-wise non-uniform distribution parameter. These expressions translate the relationships between the width-wise non-uniform distribution ratio and the specimen width as well as the material parameters. They provide a rapid method to measure correctly the pure mode I fracture toughness of an uncoupled multidirectional composite DCB specimen by integrating the effect of non-uniform distribution of the strain energy release rate at the crack front.
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