A Numerical Analysis of the Back Plane Transient Deformation of a Polycarbonate Plate


  1. Nandlall, D.
  2. Bolduc, M.
  3. Pageau, G.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
This report presents experimental and numerical studies of the back plane transient deformation of a 304.8-mm square, 4.76-mm thick, clamped polycarbonate plate impacted by a specially designed polycarbonate fragment simulating projectile. This was done to simulate the backplane transient deformation of a composite helmet. The maximum transient deformation of the back plane of the plate is presented as a function of the striking velocity. Numerical predictions of the transient backplane deformation, crater shape and the time at which the maximum transient deformation occurs are in close agreement with the experimental results. Both the numerical and experimental results show two peaks in the backplane transient deformation. It was observed that the maximum transient deformation varies linearly as a function of impact velocity for velocities above 90 m/s. Below 90 m/s the maximum transient deformation deviates from the linear curve. The numerical prediction of this anomalous behaviour compares very well with experimental observations. Numerical results also show that the reflected shock significantly influences the maximum transient deformation, especially for impact velocities above 90 m/s.
Polycarbonates;Transient deformation;IsDyna;High velocity impact;Ballistic impact;Numerical simulation;Hydrocode simulation;HYBRID III Headform
Report Number
DREV-TR-1999-160 — Technical Report
Date of publication
26 Jan 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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