A Numerical Analysis of the Back Plane Transient Defromation of a Polycarbonate Plate.
Abstract
This report presents experimental and numerical studies of the back plane transient deformation of a 3O4.8-mm square 4.76-mm thick, clamped polycarbonate plate Impacted by a specially designed polycarbonate fragment simulating projectile. This was done to simulate the back plane 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 back plane 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 back plane 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 go 90 m/s.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2000
- Accession Number
- ADA373619
Entities
People
- Dennis Nandlall
- Gilles Pageau
- Manon Bolduc