Abstract

This note presents the results of an exercise to evaluate the variation in values of G Ic at initiation, determined independently by 36 researchers interpreting the same load-displacement curve from a mode I double cantilever beam (DCB) test on unidirectional carbon fibre reinforced polymer composite. The results indicate a significantly larger coefficient of variation for values corresponding to a definition of initiation at non-linearity on the load-displacement curve than for a 5% compliance offset criterion.

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