Simulation of the backplane response of composite helmet materials under ballistic impact

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Authors
  1. van Hoof, J.
  2. Worswick, M.J.
  3. Straznicky, P.v.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Carleton Univ, Ottawa ONT (CAN) Dept of Mechanical and Aerospace Engineering
Abstract
Even though delamination is generally acknowledged as one of the main damage mechanisms in ballistically impacted laminates, information on the evolution of delaminations under ballistic conditions is scarce. The research presented in this report focuses on the deformation response of materials used in ballistic helmets, for which the impact of the delamination backplane with the head is considered to be a possible cause of skull fracture and underlying brain damage. A numerical model was developed as part of this research to gain insight into the parameters governing the penetration and deformation response of laminated composites subjected to ballistic impact. The effects of the various model parameters on the predicted ballistic response were evaluated extensively. Both instantaneous and post-failure approaches were used. It was found that the use of a post-failure approach led to a more realistic and numerically more stable response than when an instantaneous failure model was used. The through-thickness shear properties used in the numerical model were found to have a large effect on the predicted ballistic response. A number of ballistic impact tests on woven laminated Kevlar-29 composites panels were performed to evaluate the accuracy and limitations of the numerical model. Different types of projectiles with a range of impact velocities were used. TRUNCATED
Report Number
DREV-CR-2000-020 — Contractor Report (Final)
Date of publication
25 Oct 1999
Number of Pages
205
DSTKIM No
CA010101
CANDIS No
514326
Format(s):
Hardcopy;Document Image stored on Optical Disk

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