Dislocation Density-Based Finite Element Models for Viscoplasticity and Creep of High-Temperature MaterialsTools Al-Abedy, Hiydar Kireem Musraa (2020) Dislocation Density-Based Finite Element Models for Viscoplasticity and Creep of High-Temperature Materials. PhD thesis, University of Nottingham.
AbstractHigh strength materials that are used in modern power generation plants have now received much more attention because of being exposed to significant thermal gradients due to the fluctuation of demand in daily operation. However, the nature of these materials is complex and several aspects of the evolution of the microstructure still need investigation. Thus, time-dependent plasticity and creep models are appropriate for modelling the P91 steel behaviour under thermomechanical loading. This thesis reports the findings of finite element (FE) analyses and experimental investigations of uniaxial tensile, conventional creep, small punch creep (SPCT) and small tensile test (SPTT) carried out with objective of enhancing the understanding of various microstructural features which describe the creep and viscoplastic behaviours of the specimen. It also aims to develop macro-scale material models, which can predict the creep and viscoplastic behaviours under high-temperature conditions, based on microstructural variables including dislocation density and various other parameters which specify the material structure.
Actions (Archive Staff Only)
|