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Modelling crack-tip behaviour in a directionally solidified nickel alloy under fatigue-oxidation conditions
conference contribution
posted on 2020-02-27, 10:08 authored by RJ Kashinga, Liguo Zhao, Vadim SilberschmidtVadim SilberschmidtA finite-element approach, to study crack-tip behaviour for a directionally solidified nickel-based superalloy subjected to high-temperature fatigue loading in vacuum and air, is presented. In vacuum, crack-tip behaviour was entirely controlled by mechanical deformation, hence, a criterion based on accumulated plastic strain was sufficient to describe damage. In air, effects of oxidation on crack-tip deformation were studied using a diffusion-based approach; further developed to investigate a synergetic interaction between fatigue loading and oxygen penetration. Stress-assisted diffusion and dilatation from oxygen penetration into a crack tip, were considered. A local compressive stress induced by oxygen penetration compensated part of the tensile stresses from mechanical loading. To predict crack growth rate under fatigue-oxidation conditions, a two-parameter crack-growth criterion, based on accumulated plastic strain and oxygen concentration at the crack tip, was developed. Obtained numerical results compared well with experimental data in the literature.
Funding
Oxidation Damage at a Crack Tip and its Significance in Crack Growth under Fatigue-Oxidation Conditions : EP/K026844/1
Dislocation-Microstructure Interaction at a Crack Tip - In Search of a Driving Force for Short Crack Growth : EP/M000966/1
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications - Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South AfricaPages
437 - 442Source
7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019)Publisher
Taylor & FrancisVersion
- VoR (Version of Record)
Rights holder
© Taylor & Francis Group, LondonPublication date
2019-08-21Copyright date
2019ISBN
9781138386969Publisher version
Language
- en
Editor(s)
Alphose ZingoniLocation
Cape Town, South AfricaEvent dates
2nd September 2019 - 4th September 2019Depositor
Prof Liguo Zhao. Deposit date: 26 February 2020Usage metrics
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