Paper number 665
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EFFECTS OF POST-FAILURE MODELLING ON THE RESPONSE OF BALLISTICALLY IMPACTED COMPOSITES |
Jack van Hoof1, Michael J. Worswick2, Paul V. Straznicky1, and Manon Bolduc3
1Department of Mechanical and Aerospace Engineering, Carleton University,
1125 Colonel By Drive, Ottawa, Ontario, K1S 5B6, Canada
2Department of Mechanical Engineering, University of Waterloo,
Waterloo, Ontario, N2L 3G1, Canada
3Defense Research Establishment Valcartier,
2459 Pie XI Blvd. North, Val-Belair, Quebec, G3J 1X5, Canada
| Summary | A numerical model incorporating the major energy dissipation mechanisms in ballistically impacted composites (through-thickness compressive and shear failure, fibre breakage, matrix cracking, and delamination) was implemented as a user-defined material subroutine in the LS-DYNA finite element code. Post-failure response was simulated for the various failure modes using a continuum damage mechanics approach. Penetration and backplane deformation due to a 1.1 g fragment simulating projectile (FSP) impacting at velocities ranging between 400-600 m/s was predicted for flat aramid fabric-reinforced composite panels. The effects of post-failure modelling on the penetration and backplane response were investigated. |
Keywords | post-failure, ballistic impact, delamination, continuum damage mechanics, numerical simulation. |