Development of Composite Constructions with Improved Rain Erosion Resistance.
Final summary rept. 1 Apr 70-1 Nov 71,
HUGHES AIRCRAFT CO CULVER CITY CALIF ENGINEERING EQUIPMENT DIV
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The studies included the effect on rain erosion resistance as determined by whirling arm tests of such variables as matrix, reinforcement, reinforcement configuration, composition, impact angle and fiber angle with respect to the specimen surface. Matrices evaluated included rigid epoxies, flexibilized epoxies, polyurethanes, PPO, polybutadiene, and polyimide. Reinforcements included ECG glass roving, SCG glass roving, Nomex 1200 denier yarn and Dacron 1100 denier yarn. Most of the effort involved the evaluation of reinforcements in pure, unidirectionally reinforced, end-oriented plastics composites. A limited effort was also expended in evaluating three- dimensional fabrics and directional, woven tapes. The test results show that improved rain erosion resistance can be achieved by the use of polymeric fibers such as Nomex and Dacron and tough, flexible matrices such as flexibilized epoxies. Outstanding rain erosion resistance was observed in an end- oriented composite consisting of a flexibilized epoxy reinforced with Nomex fibers. Author, modified-PL
- Laminates and Composite Materials