Effect of moisture absorption on damping performance and dynamic stiffness of NY-6/CF commingled yarn composite
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The damping performance of a unidirectional (0 °) nylon 6-carbon fibre (NY-6/CF) commingled yarn composite was experimentally studied with special concern for the effect of moisture absorption. Dried specimens were immersed in distilled water for a certain time to allow water to diffuse into the material. The damping measurements were conducted on double-cantilever and cantilever beam specimens using sinusoidal and impact-hammering techniques. The damping loss factor η, flexural dynamic stiffness E′ and loss modulus E″ were evaluated as a function of the moisture content up to 8.2 wt %. η and E″ initially increased significantly with increasing moisture content up to 5–6%. Further increase of the moisture content up to 8.2% caused a slight reduction in damping ability. The reverse was true of E′ although the variation amplitude was smaller. The moisture content dependency of the damping performance obtained is discussed.
KeywordsPolymer Nylon Cantilever Beam Loss Factor Slight Reduction
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