Abstract
The influences of moisture on the fatigue crack popagation (FCP) property of advanced Nylon 46 were studied, as compared with Nylon 66. FCP property was estimated perpendicular to the injection direction of both specimens controlled for the dry condition and the equilibrium moisture content under 296K and 50% R. H. . Four kinds of tested materials were glass fiber-reinforced Nylon 46 and Nylon 66 controlled for the dry and wet condition, which are referred to as PA46(Dry), PA46(Wet), PA66(Dry) and PA66(Wet). The values of ΔK at da/dN=10-9m/cycle, ΔK (10-9)for PA46(Dry), PA46(Wet), PA66(Dry) and PA66(Wet)were 2.8, 2.5, 2.3 and 2.2MPa√(m), respectively. So, the resistance of PA46(Wet) against FCP property was found to be superior to PA66(Dry). From fractography and measuring crack tip heating, the resistance against the FCP property in four materials was controlled by the spherulite size of the matrix, the debonding strength between matrix and fiber, and the variation in glass transition temperature.
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