THE EFFECT OF GEOMETRY ON THE DEVELOPMENT OF CREEP SINGULAR FIELDS FOR DEFECTS UNDER STEP-LOAD CONTROLLED LOADING |
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Authors: | J Joch † R A Ainsworth |
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Affiliation: | National Research Institute for Machine Design, SVUSS-odb. 22, 190–11 Praha 9, Bêchovice, Czechoslovakia;Nuclear Electric plc, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire GL13 9PB, England |
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Abstract: | Abstract— The development of singular fields for defects in steadily loaded creeping structures is examined as a function of geometry and crack size using finite-element analyses and results from the literature. Approximations for estimating the time-development of the amplitude of the fields are examined and it is shown that simple approximations are expected to apply for a wide range of geometries. It is shown both theoretically and numerically that plasticity on initial loading produces crack tip fields closer to the steady state condition than those produced elastically. |
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