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

Abstract 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 I c , d y n f + = 82.0 ± 20.8 k J / m 2 , exhibiting a salient drop compared to its counterpart obtained under quasi-static loading ( G I c , Q S f + = 195.8 ± 18.0 k J / 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.