An entropy-based failure prediction model for the creep process

Abstract

The creep process is a life-limiting degradation mechanism for many parts. Consequently, it should have been considered throughout the design process. This study aimed to assess the creep curve of Inconel 718 by designing a fixed blade profile. The finite element model has been done using ABAQUS software. The temperature distribution of the vane was calculated to assess the thermal stress on the vane. For temperature analysis, the film subroutine code was written. The creep life prediction model was evaluated using creep subroutine. This model included an entropy model based on the Boltzmann theory and continuum damage mechanics. Stress and temperature were applied at a range from 100 to 900 MPa and from 620 to 800°C, respectively. Finally, an accumulation damage parameter was computed. In this investigation, all three parts of the creep curve can be achieved simultaneously. There was good agreement between the simulations performed on a vane based on this method and the samples studied in previous research.