engleski

Multiscale Modeling of High Velocity Impact Damage on Composite Structures

A multiscale damage prediction procedure has been developed which employs Abaqus/Explicit to solve the problem at the structural level of composite structures. The multiscale framework has been established applying the user material subroutine VUMAT which is coupled with the micromechanical model. The procedure is based on a computationally enhanced version of the High Fidelity Generalized Method of Cells (HFGMC) micromechanical model. The twoscale approach enables calculation of the stress field within the unit cell, based on the constitutive behavior of each subcell and the unit cell morphology. As the stress distribution is determined for the representative unit cells, calculations of failure criteria and damage effects in the composite are performed at the micro-level. Failure initiation has been predicted using three micromechanical failure criteria – the 3D Tsai- Hill model, the MultiContinuum Theory model and the 3D Hashin strain based failure criteria. The procedure is intended to establish a multiscale framework for modeling of high velocity impact damage processes at aeronautical composite structures (e.g. birdstrike, hail impact, etc.). The procedure has been tested on a numerical example in which a soft body impactor impacts a CFRP plate. The Coupled Eulerian Lagrangian formulation has been employed for modeling of the highly deformable impactor, while EOS material models have been used for soft body constitutive models.

High Fidelity Generalized Method of Cells; Multiscale analysis; Composite materials; Abaqus/Explicit; High velocity impact

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