Abstract
The layer removal procedure has been used to examine the effect of water on residual stresses in injection-moulded nylon 6,6. Nylons are highly sensitive to moisture and a method based on a Karl-Fischer titration was used to measure distribution of water within the mouldings. In the dry state or with a modest water content the moulding possessed surface compressive stresses and tensile stresses in the interior. Large amounts of water absorption caused a reversal of the stress sense due to secondary crystallization causing a relative volume change between the skin and core. Two other influences of water have been identified: (i) preferential swelling introduced additional strains; and (ii) water-induced plasticization which lowers the modulus, thus changing the stress distribution. Simple models to predict the changes in the residual stress distribution have been developed and the results agree with experimental measurements.
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Paterson, M.W.A., White, J.R. Effect of water absorption on residual stresses in injection-moulded nylon 6,6. J Mater Sci 27, 6229–6240 (1992). https://doi.org/10.1007/BF01133776
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DOI: https://doi.org/10.1007/BF01133776