Abstract
The mechanical behaviour of composite materials during perforation during high but also low-velocity impacts is of interest in many engineering fields. Perforation of composites is a very complex event that yields a multi-mode failure, making numerical modelling very challenging. This paper presents a novel approach to study the perforation of composites under low-velocity impact, aided by the recording of the response during impact tests and by a comprehensive validation campaign in quasi-static conditions. The performance of S2-glass fibre reinforced polymer (GFRP) composites under low-velocity impact with energies higher than their penetration limit is experimentally and numerically investigated. A strain-rate dependent cohesive model is developed and implemented in the FE solver using a user-defined material model. The cohesive model is used in the proposed numerical framework based on the Coupled Finite Element-Discrete Element Method (FDEM). Strain-rate dependent mechanical properties, such as tensile and fracture toughness, are used as inputs of the cohesive model to describe failure and perforation. The results showed that the new approach is accurate in predicting the damage morphology of perforated woven composites subjected to low-velocity impacts. The coupling between interlaminar and intralaminar failure modes led to a more accurate prediction of the delamination area by considering the rate sensitivity effect on the latter.
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Rezasefat, M., da Silva, A.A.X., Amico, S.C., Giglio, M., Manes, A. (2023). Strain-Rate Dependent FDEM Simulation of the Perforation Behaviour of Woven Composites Subjected to Low-Velocity Impact. In: Lopresto, V., Papa, I., Langella, A. (eds) Dynamic Response and Failure of Composite Materials. DRAF 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-28547-9_35
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