Large earthquakes transfer stress from the shallow lithosphere to underlying viscoelastic lower crust and upper mantle, inducing transient creep during postseismic interval. Recent experiments on olivine have provided a new rheological model for this based accumulation release of back stresses among dislocations. Here, we test whether natural rocks preserve dislocation-induced heterogeneity con...

Time-dependent creep stress redistribution analysis of thick-walled FGM spheres subjected to an internal pressure and a uniform temperature field is investigated. The material creep and mechanical properties through the radial graded direction are assumed to obey the simple power-law variation throughout the thickness. Total strains are assumed to be the sum of elastic, thermal and creep strain...

Modern methodologies that aim to reduce conservatism in the design of components operating at high temperatures rely on accurate predictions of materials’ behaviour in conditions relevant to those experienced in service. This requirement has focussed the attention of materials engineers on developing a quantitative understanding of damage-accumulation in engineering alloys. The microstructure o...

In the present work, we propose a novel model coupling phase-field, dislocation density based plasticity and damage. The governing equations are constructed on evolutions of mobile immobile dislocations. Mechanisms including multiplication, annihilation, mobile–immobile transfer due to interactions block interfaces incorporated in model. Especially, “swallow-gap” problem surrounding coarsened s...

Creep of directionally solidified Sn-3Ag-0.5Cu wt.% (SAC305) samples with near-<110> orientation along the loading direction and different microstructural lengthscale is investigated under constant load tensile testing at a range temperatures. The creep performance improves by refining microstructure, i.e. decrease in secondary dendrite arm spacing ({\lambda}2), eutectic intermetallic ({\lambda...

Microstructural evolution related to the mechanical response from isothermal dwell-fatigue testing at 700 °C of two austenitic steels, Esshete 1250 and Sanicro 25, is reported. Coherent Cu-precipitates incoherent Nb-carbides were found impede dislocation motion, increase hardening improving high temperature properties 25. Sparsely placed intergranular Cr- made susceptible creep damage crack pro...