Development of true-stress creep model through analysis of constant-load creep data with application to finite element methods. (December 2014)

• Record Type: Journal Article
• Authors: Connolly, M.; Whittaker, M.; Williams, S.
• Is Part Of: Materials science and technology. Volume 30:Number 15(2014)
• Page Start: 1899
• Page End: 1904
• Publication Date: 2014-12
• Subjects: Creep, -- True-stress creep, -- Constant load creep, -- Nickel superalloy, -- Finite element modelling of specimen test; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284714Y.0000000539
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The creep behaviour of the nickel superalloy RR1000 is studied through a number of constant-load creep tests. It is often assumed that creep data generated by constant-load testing are unsuitable for building a generalised creep model due to the non-constant stresses incurred. Analysis of existing models shows that significant errors may occur in many approaches, which attempt to recreate the strain evolution with time. A model is presented which is not reliant on time as a parameter and is therefore able to utilise constant-load creep data without enforcing the assumption of a constant stress. This model is demonstrated through numerical analyses to replicate the creep behaviour across a large range of stresses accurately. The proposed model is then adapted as an Abaqus user-subroutine to demonstrate capability within finite element analysis.