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Practical considerations of the use of cross-weld and compact tension specimens creep data

Petkov, Markian P.; Hyde, Christopher J.; Hyde, Thomas H.

Authors

Markian P. Petkov

Christopher J. Hyde

Thomas H. Hyde



Abstract

This article gives an overview of the use of cross-weld and compact tension specimen modelling and analyses data to characterise creep behaviour of the high-temperature components. Cross-weld and compact tension specimens are used to describe creep crack growth in heterogeneous material structures, such as welds, and a number of factors that affect the creep behaviour of the structure, associated with this heterogeneity, have been identified. Creep data obtained from cross-weld specimen modelling are substantially affected by the material model used (e.g. Norton power law, Liu-Murakami), stress singularities that arise at the material interfaces and in between the columnar and equiaxed zones of the weld material, residual stresses which arise through the thickness of a multi-pass weld and the extraction orientation of the specimen relative to the welding direction. Creep crack growth data obtained from compact tension specimen testing and analyses are strongly dependent on the material models used (isotropic hardening models, Norton creep law, Liu/Murakami model, etc.), the path dependence of the C*-contour integral fracture parameter for certain heterogeneous material configurations and the accurate computation of material constants for damage mechanics models and the agreement between loading state to the actual stress state of the component to which the compact tension specimen creep data are applied to. This study examines typical results and observations from cross-weld specimen and compact tension specimen creep analyses, identifying the advantages, disadvantages and limitations of each specimen procedure.

Citation

Petkov, M. P., Hyde, C. J., & Hyde, T. H. (2016). Practical considerations of the use of cross-weld and compact tension specimens creep data. Journal of Strain Analysis for Engineering Design, 51(3), https://doi.org/10.1177/0309324715627575

Journal Article Type Article
Acceptance Date Dec 12, 2015
Online Publication Date Feb 15, 2016
Publication Date Apr 3, 2016
Deposit Date Jul 29, 2016
Publicly Available Date Jul 29, 2016
Journal Journal of Strain Analysis for Engineering Design
Print ISSN 0309-3247
Electronic ISSN 0309-3247
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 51
Issue 3
DOI https://doi.org/10.1177/0309324715627575
Keywords Creep; creep data; cross-weld; compact tension; creep crack growth; C*-integral; damage mechanics; fracture
Public URL http://eprints.nottingham.ac.uk/id/eprint/35546
Publisher URL http://sdj.sagepub.com/content/51/3/179.abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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