Sensitivity analysis of steel hole plate by utilizing computational methods and newly developed creep model

The rise in operational parameters, structural elements within power plants are exposed to heightened temperatures and pressures, reaching levels conducive to creep. Considerable work has been devoted in the previous decades to understand the basic mechanism of material’s creep deformation. Specifically for stainless steel, this article presents a modified model that builds upon the Norton-Bailey and Kachanov–Rabotnov constitutive models to thoroughly characterise all three phases of creep (primary, secondary, and tertiary). The proposed model undertakes numerical calculations to simulate damage development in thin-hole steel plate. The outcomes of the study reveal the efficacy of the novel model in generating complete creep curves for stainless steel, emphasising the notable impact of stress on creep behaviour and damage progression. Sensitivity studies are carried out using Response Surface Methodology (RSM) and Analysis of Variance (ANOVA) to analyse the new creep model data both statistically and qualitatively in relation to existing models.