An investigation of the creep-fatigue-environment interaction in a Ni-base superalloy 403 t4 Fig. 1. Compact tension fracture toughness specimen (dimensions in mm). measured so that crack lengths in the test specimens can be determined from the total displacement. The advantage of this method is that once the calibration is completed
Creep and creepfatigue crack growth SpringerLinkFeb 17, 2015 · A new crack growth model for creepfatigue environment effects was developed by Evans and Saxena incorporating a thermally activated dislocation model of Yokobori et al. and an environmentally assisted time-dependent crack growth model to predict the creepfatigueenvironment interactions in creep-brittle materials. This new model
Creep-fatigue testing of alloy 617 was performed in air, vacuum, and purified Ar environments at 1000 °C. Tests were performed in axial strain control at total strain ranges of 0.3% and 1.0% (fully reversed) with hold times at maximum tensile strain ranging from 0 to 1800 s. Introduction of a tensile hold period led to reduced creep-fatigue life at both strain ranges in all environments; the effect was greater at
DETERMINATION OF THE CREEPFATIGUE INTERACTION This cycling introduces a creep-fatigue type of interaction as dwell times occur intermittently. The leading candidate alloy for the IHX is a nickel-base solid solution strengthened alloy, Alloy 617, which must safely operate near the expected more » reactor outlet temperature of up to 950 °C.
Finite element analysis of creep-fatigue-oxidation Oct 01, 2020 · The complex interaction for bulk creep, fatigue, and environmental damage of alloys requires to be assessed in terms of a time-dependent, cycle-dependent, and inter-dependent phenomena in order to quantify the overall damage which is induced in a component operating at high temperatures.
The goal of this project is to model creep-fatigue-environment interactions in steam turbine rotor materials for advanced ultra-supercritical (A-USC) coal power Alloy 282 plants, to develop and demonstrate computational algorithms for alloy property predictions, and to determine and model key mechanisms that contribute to the damages caused by creep-fatigue-environment interactions.
The Mechanism of Creep during Crack Propagation of a the fatiguecreepenvironment interaction for the long-term reliability of 718Plus components and the safe operation of an aero engine. Based on the above background, this study simulated and predicted the crack propagation during the process of start-run-stop of the aero-engine. The e ect of creep onThe interactions between fatigue, creep and environmental Oct 01, 2005 · Important additional factors highlighted now include notch geometry and loading conditions with the relative magnitude of each defining the bias in the fatiguecreep interaction. Environmental factors also increase in importance at high temperature and these are highlighted and their relative importance with respect to creep defined through crack growth studies.