Technical Reports

Equipment Testing and Analysis - Glazing Impact Test: An Evaluation of Two Plastic and Glass Window Systems Subjected to Projectile Impacts

  • 01
  • Mar
  • 1988
AUTHOR: William G. Larson
SUBJECT: Facilities & Test Equipment
KEYWORDS: Passenger Cars, Impact Tests, Impact Resistance
ABSTRACT: Impact tests were conducted at the Transportation Test Center on two glazing systems installed in railroad locomotives, passenger cars, and cabooses. A 1/4" thick extruded polycarbonate plastic and a 1/4" thick cast acrylic plastic, each installed in combinations with a 1/4" thick sheet of tempered safety glass, were subjected to standard cinder block and 22-caliber bullet impact tests. The tests were conducted in accordance with the procedures described in CFR Title 49, Part 223 - "Safety Glazing Standards - Locomotives, Passenger Cars, and Cabooses." The results derived from the tests will be used by the FRA in its research to identify which window glazing combinations will protect railroad employees and passengers from injury as the result of vandalism. This report presents details of the 18 impact tests performed by the Research and Test Department of the Association of American Railroads. It compares the impact resistance of the two plastic and safety glass system combinations and includes a comparative partial test of a double safety glass system.