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Energy Absorption Mechanisms in Hard Epoxy Resin Matrix Composite Laminates Subjected to Dynamic Loading Events

[+] Author Affiliations
David B. Segala, Paul V. Cavallaro

Naval Undersea Warfare Center, DIVNPT, Newport, RI

Paper No. IMECE2013-62283, pp. V009T10A030; 9 pages
doi:10.1115/IMECE2013-62283
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5638-3

abstract

Three energy absorption mechanisms of severe dynamic loading events are numerically investigated using a finite element model of a cross-ply unidirectional (UD) composite laminate. In this study, the inelastic energy absorption mechanisms associated with damage at the interfacial and constituent levels were numerically characterized through three admissible failure modes: fiber breakage, matrix shearing, and fiber/matrix debonding (delamination) (i.e., cohesive failure). The UD composite was constructed of ultrahigh molecular weight polyethylene (UHMWPE) fibers separately reinforced with a rigid (epoxy) matrix material. The energy absorption capacities of these damage mechanisms were contrasted for three different dynamic loading cases including blast, shock, and ballistic impact at three different energy levels. Energy loss due to cohesive failure was observed in all three loading cases and energy levels. Furthermore, energy loss due to matrix failure was observed at all energy levels for the blast case, but only for the highest energy level in the shock and ballistics. There was energy loss due to fiber failure in the blast and in the highest energy ballistics impact case. However, there wasn’t any fiber damage in the shock case.

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