Calculation Strategy for the Determination of Plasticity Correction Factors

Abstract

This paper presents an investigation about the plasticity correction factor, Ke, proposed in the RCCM code, for correction of the elastic stress ranges exceeding twice the yield stress, resulting from both mechanical and thermal loading. The plasticity correction factors are analyzed using a calculation strategy based on a comparison between results from linear elastic and elastoplastic analyses. The RCC-M code provides the codified expressions of Ke and material parameters for general materials of nuclear components, but there are no expressions and material parameters for the new material. Several elastoplastic models, geometries and loading types are considered in the study based on the general material listed in RCCM code to determine the calculation strategy for the determination of Ke for new material. Based on the results, the determination of Ke expressions and parameters for Titanium Alloy is discussed. The proposed Ke factor of Titanium Alloy has been determined and delivered the same sufficiently conservative results. An exemplary verification calculation of general materials that have been performed and the conservative allowance is obtained.