Creep Modeling in a Composite Rotating Disc with Thickness Variation in Presence of Residual Stress

Abstract

Steady-state creep response in a rotating disc made of Al-SiC (particle) composite having linearly varying thickness has been carried out using isotropic/anisotropic Hoffman yield criterion and results are compared with those using von Mises yield criterion/Hill's criterion ignoring difference in yield stresses. The steady-state creep behavior has been described by Sherby's creep law. The material parameters characterizing difference in yield stresses have been used from the available experimental results in literature. Stress and strain rate distributions developed due to rotation have been calculated. It is concluded that the stress and strain distributions got affected from the thermal residual stress in an isotropic/anisotropic rotating disc, although the effect of residual stress on creep behavior in an anisotropic rotating disc is observed to be lower than those observed in an isotropic disc. Thus, the presence of residual stress in composite rotating disc with varying thickness needs attention for designing a disc.

Creep crack growth properties of P91 and P22 welded joints

“…The crack length was determined using the direct potential drop method. Fracture parameter determinations of experimental data collection were performed in accordance with the recommendations of the ASTM standard E1457 .…”

“…For the purpose of improving energy efficiency and reducing of CO 2 emissions, as well as to prevent failures of high‐temperature components in power plants, significant research effort in the recent decades involved creep damage or cracking in welded joints . Traditional approach is based on stress analysis of homogeneous material, without taking into account cracks , but in the case of welded joints, more sophisticated analysis is needed, including the effect of creep cracking . Reliable and accurate methods for predicting creep crack growth (CCG) are thus needed to evaluate the safety of such components.…”

Creep crack growth behavior of P91 steel weldments

“…Safe and accurate methods to predict CCG are therefore required in order to assess the reliability of such components, [1]. Finite element (FE) methods has been applied extensively in the study of CCG to predict the fracture mechanics parameters in estimating CCG rates, [2][3][4][5][6], as well as some analytical and empirical methods to predict creep strain, [7][8][9][10][11].…”