Causes of Delamination Failures of Kevlar/Epoxy Laminates Used in Hardened Army Tactical Shelters
ARMY LAB COMMAND WATERTOWN MA MATERIALTECHNOLOGY LAB
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A series of chemical, mechanical, and physical tests were performed on Kevlarepoxy laminates to determine the cause of failure in a structure which had undergone extensive delamination during a simulated solar load test. The results of these tests indicated that improper fabrication procedures caused microcracking at the fiber matrix interface which made the material particularly susceptible to invasion by environmental moisture and subsequent delamination at elevated temperatures. The material was also found to have been undercured by approximately 30. Acting on recommendations resulting from this study, the fabricator was able to eliminate the microcracking and significantly increase the degree of cure in the laminates. Preliminary measurements of the effect of moisture on the mechanical properties of the laminate suggested that design properties of the material should be determined at elevated temperature and humidity.
- Laminates and Composite Materials
- Structural Engineering and Building Technology