Abstract
The energy release rates G applicable to various beam specimens used to measure the delamination resistance of composites have been calculated using finite element methods. The results have been compared with beam theory solutions, G BT . While appreciable discrepancies exist, it has been found that the differences are expressible through a nondimensional parameter, ρ, identified from orthotropy rescaling. Consequently, accurate solutions for G are presented in terms of G BT , qualified by analytical series functions containing ρ.
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