Abstract
Mode I delamination toughness ( G Ic) of a laminated composite depends not only on the stacking sequence or indirectly coupling parameter of D c = D 12 2 D 11 D 22 , but also on specimen geometrical ratios a 0/ b and a 0/ h. In this study, a non-uniformity ratio, β = ( G Imax − G Iavg)/ G Iavg%, is introduced to take into account the influence of above factors on the energy release rate distribution along the width of double cantilever beam (DCB) specimens simultaneously. Results show that the G Ic of multidirectional DCB specimens with 0°//0° crack interface and β < 20% can be predicted by measuring the G Ic of the unidirectional plies with an error less than 10%. Moreover, a methodology is proposed to predict the maximum delamination toughness ( G Imax) of multidirectional DCB specimens from β parameter without performing any experiments. With the present method, the effect of curved thumbnail shape of energy release rate along the delamination front is considered on the available closed-form relations for G I.
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