Abstract
A method is presented for the analysis of residual stresses in parallel-sided polymer mouldings with depth-varying Young's modulus. The experimental procedure is the same as the layer removal technique developed by Treuting and Read and requires removal of uniform layers from the surface and measurement of the resulting curvature when all external tractions are removed. When the Young's modulus varies with depth, certain of the simplifications made by Treuting and Read are no longer valid, but it is shown here that a satisfactory alternative procedure can be used as long as the modulus distribution is known. Examples of the application of the new procedure are given for an injection-moulded nylon 6, 6 bar stored in dry conditions, in which the modulus rose steeply near to the surface, and another bar, also made from nylon 6, 6, in which exposure to water produced a quite different distribution, with a maximum at the centre.
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