Friction Between Glass Fiber and Resin in Glass Reinforced Plastics,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The glass fiber vs plastic friction phenomena and their consequences were measured on laminates of Buna G polyester and a hydrocarbon-based resin reinforced by a commercial twill-weave glass fiber fabric by determining the decay of a torsional vibration in a specimen. The results showed that considerable friction develops if the glass fiber is not securely bonded to the plastic. The consequences of unduly high friction include a decrease in torsion modulus, an increase in mechanical loss, and development of non-uniform stress distributions ultimately capable of causing cracks. If water penetrates the laminate for example, after boiling in water, the fiber to plastic bond sometimes deteriorates, resulting in increased friction. The effect of water may be reduced by using highly water-absorbent resin polyester absorbed much more water than did the hydrocarbon-based resin. The bonding agents evaluated were ethyltrichlorosilane, gamma-methacryl-hydroxypropyl-trimethoxysilane, a chromium chloridemethacrylate complex, and Finish 112.
- Laminates and Composite Materials