Determination of the strain-energy release rate of a composite laminate under high-rate tensile deformation in fibre direction

摘要

In order to successfully model design-critical impact loading events on laminated composite structures, the rate dependency of the composite material has to be correctly reflected. In this context, the rate-dependency of the strain-energy release rate for fibre tensile failure under high-rate loading conditions has not yet been satisfyingly explored. This study employed compact tension specimens consisting of IM7/8552 for dynamic testing on a split Hopkinson tension bar system. Data reduction was based on the area method. The obtained strain-energy release rate for testing under high-rate conditions was determined to G(Ic,dyn)(integral+) = 82.0 +/- 20.8kJ/m(2), exhibiting a salient drop compared to its counterpart obtained under quasi-static loading (G(Ic,Qs)(integral+) = 195.8 +/- 18.0kJ/m(2)). Analysis of the strain field surrounding the crack tip using digital image correlation (DIC) suggested a more extensive damage zone for testing under quasi-static than for high-rate loading. A fractographic analysis of the specimens did not indicate any pronounced difference in terms of fracture surface morphology across the two loading rate regimes.