THE EFFECT OF RESIN CONTENT AND VOIDS ON THE STRENGTH OF FIBERGLASS- REINFORCED PLASTICS FOR AIRFRAME USE
OKLAHOMA UNIV RESEARCH INST NORMAN
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As a further step toward the acceptance of fiber glass reinforced plastics FRP in primary aircraft structure, the effects of resin content on laminate strength properties were investigated in depth. Functional relationships were obtained and methods of controlling resin content were compared. Uniformity in strength and resin content was observed from the point of view of replication and within-laminate conditions. Most of the data were for laminates of EPON 828-Z epoxy resin reinforced with the 181 style fiberglass fabric however, limited data were obtained for the 120 and 909 S-920 fabrics. In addition, a preliminary study was made of the effects of voids in the cured laminates. A critical size was observed for large artificial voids, and the microvoid content of the pre-preg was minimized by modification of a previously developed multi-ply coating machine. Non-destructive methods of testing for voids were also reviewed.
- Laminates and Composite Materials