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Engineering structures exposed to high temperature environment exhibit time dependent behaviour due to time dependent material behaviour. In order to avoid full inelastic analyses, simplified inelastic analysis methods are desirable. The concept of elastic follow-up was introduced to allow determination of quantities servicing as measure for life assessment of structures subjected to creep conditions without performing full time dependent structural analyses. Various simplified methods are described in the literature to estimate enhancement of creep strain and of creep damage arising from the fact that so-called secondary stresses caused by displacement controlled loading do not necessarily relax with time in the same way as stresses caused by strain controlled loading, but show some characteristics of stress controlled loading. After providing a definition of elastic follow-up, the fundamental principles of elastic follow-up are compiled in the present report. A parameter, q, is introduced as a measure of elastic follow-up and derived for some basic structures as examples. Effects of non-uniform temperature distribution are discussed as well as effects resulting from multiaxial stress states. A number of methods to quantify elastic follow-up by simplified methods adopted by design codes or proposed in the literature are reviewed separately for general structures and for piping.

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Authors: HÜBEL H, Fachhochschule Lausitz, Fachbereich Baningenieurwesen, Senftenberg (DE);ZEIBIG H, Technische Beratung, Bergisch Gladbach (DE)
Bibliographic Reference: EUR 16556 EN (1996) 103pp., FS, ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-827-5009-4