Inelastic Analysis and Thermal Fatigue Life Prediction of Perforated Cylinder Based on Effective Stress Concept
Toshihide IGARI, Takumi TOKIYOSHI and Yorikata MIZOKAMI
Abstract:In order to examine the applicability of the effective-stress-based analysis method of perforated plates which was proposed by the authors, inelastic behavior and creep-fatigue life of perforated cylinder subjected to cyclic thermal stress are predicted. Firstly, basic creep behavior of perforated cylinder under axial tension at uniform temperature is examined by three-dimensional FEM creep analysis, and the results show that macroscopic and local creep behavior of perforated cylinder is predictable using the proposed method on perforated plates. Secondly, thermal fatigue test of perforated cylinder is carried out, and the elastic-plastic-creep behavior of perforated cylinder is numerically analyzed by modeling the perforated cylinder to the equivalent solid cylinder based on the effective stress concept. Predicted local stress-strain behavior around circular holes is used for creep-fatigue life prediction based on the linear damage rule. Comparison of numerical results and experimentally observed damage clarifies that the difference of damage mode at inner and outer surfaces of perforated cylinder can be successfully reproduced. Key Words:nelastic analysis, Constitutive equation, Perforated plate, Thermal fatigue, Creep-fatigue life prediction