Evaluation of Structural Properties of Glass Reinforced Plastic Construction after Prolonged Exposure to 325 deg F
GENERAL DYNAMICS CORP FORT WORTH TX
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Results show that the three resin systems tested can satisfactorily operate at 325 deg F for 1000 hours. It can also be concluded that the present design allowable based on acceptance values for 300 deg F for 12 hour exposure are realistic for 1000 hours exposure at 325 deg F without reductions. Modified polyester appears to be the best resin for applications where the material is exposed to 325 F for 3000 hours. Although the mechanical properties of epoxy resin began to decrease sometime between 1000 hours and 3000 hours they were still within a practical range after 3000 hours exposure. Phenolic material was definitely affected by the long exposure at 325 deg F and its mechanical properties after 3000 hours exposure were unsatisfactory. The electrical properties of the epoxy and modified polyester laminates were satisfactory for all practical purposes after 3000 hours exposure at 325 deg F. The Epoxy and Phenolic laminated faced sandwich specimens had very similar creep characteristics when exposed at 325 deg F.
- Laminates and Composite Materials