NONLINEAR ANALYSIS AND FATIGUE LIFE ESTIMATION OF ATTEMPERATOR USING FE BASED APPROACH

摘要

The present work is concerned to identify the root cause analysis for the crack generation in an Attemperator and suggesting the optimal solution in order to meet the required number of fatigue life of the Attemperator and henceforth to maintain the damage index value less than one. In this project, nonlinear material properties are considered for the analysis from ASME/EN pressure vessel standards and EN standards are used to estimate the fatigue life of the component. In the present scenario, the design-by formula approach does not control fatigue damage since such damage is caused by local stress and strain conditions which are not considered in the membrane stress evaluation. The local maximum range of von Mises stress and stress intensity and the thermal strain are the most important determinant of low cycle fatigue damage, with the local stress conditions contributing a mean stress effect.