Stability of Glass Fiber-Plastic Composites.
Final rept. 19 Nov 71-19 Apr 73,
AUBURN UNIV ALA
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The results of this research show that the degradation that occurs in the S-glass epoxy composites takes place primarily in the glass structure at its surface. The effect of high humidity exposure on the strength of individual S-glass fila-ments and composites made up of S-glass roving and EPON 828D was determined. The initial effect on the uncoated glass filaments is a loss of strength followed by stabilization with a slight recovery of strength on further exposure. The effect on the composite is always degradation. It was found, however, that the effect of water treatment on the glass roving before making up the composite reduced the general strength level but reduced the degradation rate and the scatter of strength in the group. It is concluded that the most direct approach is to develop a sizing-coupling formulation and application technique to prevent degradation by the water-glass reactions. Author-PL
- Laminates and Composite Materials