Identification of a computationally efficient numerical model for honeycombs using a multi-objective taguchi optimization process

Due to their high specific strength and stiffness, honeycomb sandwich structures are used in impact-resistance applications. Their structural efficiency depends to a great extent on the lightweight core separating the face sheets and providing overall high stiffness. Detailed finite element (FE) modelling of the penetration of honeycombs by a projectile can be occasionally complex and computationally expensive. In this paper, a computationally efficient equivalent numerical model for a hexagonal honeycomb subjected to high-speed impacts is developed in ABAQUS/Explicit, based on an equation-of-state model for porous media. A multi-objective Taguchi optimization is used to identify unknown material parameters in this model. It is shown that with the optimal set of parameters, the equivalent model can closely predict perforation velocities, particularly in the higher ranges, for different impact conditions, requiring less than 8% of the time needed to run a detailed FE model of the same honeycomb configuration.