A Meso-Scale Unit-Cell Based Material Model for the Single-Ply Flexible-Fabric Armor
CLEMSON UNIV SC DEPT OF MECHANICAL ENGINEERING
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A meso-scale unit-cell based material model for a prototypical plain-woven single-ply flexible armor is developed and implemented in a material user subroutine for use in commercial explicit finite element programs. The main intent of the model is to attain computational efficiency when calculating the mechanical response of the multi-ply fabric-based flexible armor material during its impact with various projectiles without significantly sacrificing the key physical aspects of the fabric microstructure, architecture and behavior. To validate the new model, a comparative finite element method FEM analysis is carried out in which a the plain-woven single-ply fabric is modeled using conventional shell elements and weaving is done in an explicit manner by snaking the yarns through the fabric and b the fabric is treated as a planar continuum surface composed of conventional shell elements to which the new meso-scale unit-cell based material model is assigned. The results obtained show that the material model provides a reasonably good description for the fabric deformation and fracture behavior under different combinations of fixed and free boundary conditions.