A holistic approach to Thermo-Mechanical Fatigue phase angle effects for an aerospace nickel superalloy

A holistic approach to Thermo-Mechanical Fatigue phase angle effects for an aerospace nickel superalloy

•Largest collection of load-controlled and strain-controlled TMF data for any material with Δε = 0.8–1.4%, and ϕ = 0, 45, 90, −90, −45, 180 °C.•Holistic approach to understanding the effect of TMF phase angle on mechanism and life.•Develops relationship to predict all other phase angle TMF lives fro...

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Bibliographic Details
Published in:International journal of fatigue Vol. 156; p. 106631
Main Authors: Gray, V., Jones, J.P., Whittaker, M.T., Lancaster, R.J., Pretty, C.J., Williams, S.J.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-03-2022
Elsevier BV
Subjects:
Crack propagation
Creep (materials)
Fatigue failure
Fracture mechanics
Lifing
Materials fatigue
Modelling
Modulus of elasticity
Nickel base alloys
Oxidation
Phase angle
Phase shift
Superalloys
Thermo-mechanical fatigue
Thermo-mechanical fatigue
Modelling
Phase angle
Lifing
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Summary:•Largest collection of load-controlled and strain-controlled TMF data for any material with Δε = 0.8–1.4%, and ϕ = 0, 45, 90, −90, −45, 180 °C.•Holistic approach to understanding the effect of TMF phase angle on mechanism and life.•Develops relationship to predict all other phase angle TMF lives from IP and OOP data only. Thermo-Mechanical Fatigue (TMF) is one of the most complex mechanical phenomena that couples creep, fatigue and oxidation. So far, developing simple empirical relationships like those that exist in isothermal equivalents have proven elusive. This work presents a study on the TMF behaviour of the aerospace nickel based superalloy RR1000 using TMF fatigue crack growth rates, strain controlled TMF results, studies of the fracture morphologies and empirical lifing models. This paper takes a holistic approach to TMF lifing, specifically focusing on the impact of phase angle. As a result, this work develops an elastic modulus normalisation technique that when a Coffin-Manson type relationship is applied, predicts life of material under interim TMF phase angles.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106631