Inelastic analysis and thermal fatigue life prediction of a perforated cylinder based on the effective stress concept

In order to examine the applicability of the effective-stress-based analysis method of perforated plates that is proposed by the authors, inelastic behavior and creep-fatigue life of a perforated cylinder subjected to cyclic thermal stress were predicted. Firstly, basic creep behavior of a perforated cylinder under axial tension at uniform temperature was examined by means of three-dimensional FEM creep analysis, and the results showed that macroscopic and local creep behavior of a perforated cylinder is predictable using the proposed method on perforated plates. Secondly, thermal fatigue testing was carried out on a perforated cylinder, and the elastic-plastic-creep behavior of the cylinder was 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 was used for creep-fatigue life prediction based on the linear damage rule. Comparison of numerical results and experimentally observed damage clarified that the difference in damage mode at the inner and outer surfaces of a perforated cylinder could be successfully reproduced. (Cylinder material: Hastelloy X.)