DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
A Ballistic Material Model for Cross-Plied Unidirectional Ultra-High Molecular-Weight Polyethylene Fiber-Reinforced Armor-Grade Composites
CLEMSON UNIV SC
Pagination or Media Count:
The known fiber and polymeric-matrix material properties, unit-cell microstructural characteristics and unit-cell level finite-element analyses are used to construct a new ballistic material model for 0 deg90 deg crossplied oriented polyethylene fiber-based armor-grade composite laminates. The model is constructed in such away that it can be readily integrated into commercial finite-element programs like ANSYSAutodyn ANSYSAutodyn version 11.0, User Documentation, Century Dynamics Inc., a subsidiary of ANSYS Inc., 2007 and ABAQUSExplicit ABAQUS version 6.7, User Documentation, Dessault Systems, 2007 as a user material subroutine. To validate the model, a series of transient non-linear dynamics simulations of the transverse impact of armor-grade composite laminates with two types of bulletsprojectiles is carried out. The results obtained are next compared with their experimental counterparts. This comparison revealed that a relatively good agreement is obtained between the experimental and the computational analysis relative to a the success of the armor panels of different areal densities in defeating the bullets at different initial bullet velocities b post-mortem spatial distribution of damage within the panels c the temporal evolution of a bulge at the back-face of the armor and d the existence of three distinct armor-penetration stages i.e. an initial filament shearingcutting dominated stage, an intermediate stage characterized by pronounced filamentmatrix de-bondingdecohesion and the final stage associated with the extensive bulging of the armor panel.
APPROVED FOR PUBLIC RELEASE