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- W1998172557 abstract "As code-based fully elastic plastic code conforming fatigue analyses are still time consuming, simplified elastic plastic analysis is often applied. This procedure is known to be overly conservative for some conditions due to the applied plastification (penalty) factor Ke. As a consequence, less conservative fully elastic plastic fatigue analyses based on non-linear finite element analyses (FEA) or simplified elastic plastic analysis based on more realistic Ke factors have to be used for fatigue design. The demand for more realistic Ke factors is covered as a requirement of practical fatigue analysis. Different code-based Ke procedures are reviewed in this paper with special regard to performance under thermal cyclic loading conditions. Other approximation formulae such as those by Neuber, Seeger/Beste or Kuehnapfel are not evaluated in this context because of their applicability to mechanical loading excluding thermal cyclic loading conditions typical for power plant operation. Besides the current code-based Ke corrections, the ASME Code Case N-779 (e.g. Adam’s proposal) and its modification in ASME Section VIII is considered. Comparison of elastic plastic results and results from the Rules for Nuclear Facility Components and Rules for Pressure Vessels reveals a considerable overestimation of usage factor in the case of ASME III and KTA 3201.2 for the examined examples. Usage factors according to RCC-M, Adams (ASME Code Case N-779), ASME VIII (alternative) and EN 13445-3 are essentially comparable and less conservative for these examples. The Kv correction as well as the applied yield criterion (Tresca or von Mises) essentially influence the quality of the more advanced plasticity corrections (e.g. ASME Code Case N-779 and RCC-M). Hence, new proposals are based on a refined Kv correction." @default.
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- W1998172557 date "2011-08-01" @default.
- W1998172557 modified "2023-09-25" @default.
- W1998172557 title "Performance study of Ke factors in simplified elastic plastic fatigue analyses with emphasis on thermal cyclic loading" @default.
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- W1998172557 doi "https://doi.org/10.1016/j.ijpvp.2011.06.008" @default.
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