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ON THE GENERATION OF RESIDUAL STRESSES IN THERMO VISCOELASTIC BODIES,
STANFORD UNIV CALIF
TENT OF RESIDUAL STRESS DISTRIBUTIONS IN THERMO-VISCOELASTIC MATERIALS DUE TO SURFACE COOLING IS CONSIDERED. They arise because the non-uniform thermal contraction generates irre versible viscoelastic deformation, which tends to become permanent as the temperature falls due to the rapid growth of relaxation times with tempera ture reduction. Examples of a cooled solid sphere of polymethylmethacrylate are evaluated and the results are compared with previous analyses based on an elastic-inviscid fluid model. For application in design to generate beneficial residual stress distributions, the need to assess the entire stress history is pointed out, and relevant features of the pheno menon are discussed. Author