Modelling creep failure in welded plates under uniaxial loading
Modelling creep failure in welded plates under uniaxial loading
Understanding more fully the behaviour of weldments is important since they can reduce the lifetime of structures at high temperatures, but performance factors are omitted from most existing design codes (with the exception of the high temperature fast reactor codes). Simple mathematical models which produce approximate solutions quickly are useful since they allow the design engineer to carry out rapid simulations. In this paper the ideas of continuum damage mechanics are incorporated into a model, based on the Cosserat theory of plates and a multi-axial version of Norton's creep law, which has been used recently to calculate the steady state creep strain rates in a weldment. Failure results are calculated numerically for a ferritic plate of constant thickness subject to uniaxial loading, the plate containing parent and weld metals, type IV material and a high-temperature heat-affected zone (HAZ). Results obtained for various material parameters and weldment configurations show that rupture times depend strongly on the choice of generalized stress in the damage evolution equation. The results also reveal that changes to the material strength of a region cannot be made in isolation if physically realistic results are to be obtained and, further, that early failures can occur if there are large differences in strength between the various parts of the weldment.
117-124
Craine, R.E.
6891a4b5-7b12-4019-8222-8a8448803890
Newman, M.G.
6ef2eae3-0c49-4941-8f3d-1b7a8234b3ca
1996
Craine, R.E.
6891a4b5-7b12-4019-8222-8a8448803890
Newman, M.G.
6ef2eae3-0c49-4941-8f3d-1b7a8234b3ca
Craine, R.E. and Newman, M.G.
(1996)
Modelling creep failure in welded plates under uniaxial loading.
The Journal of Strain Analysis for Engineering Design, 31 (2), .
Abstract
Understanding more fully the behaviour of weldments is important since they can reduce the lifetime of structures at high temperatures, but performance factors are omitted from most existing design codes (with the exception of the high temperature fast reactor codes). Simple mathematical models which produce approximate solutions quickly are useful since they allow the design engineer to carry out rapid simulations. In this paper the ideas of continuum damage mechanics are incorporated into a model, based on the Cosserat theory of plates and a multi-axial version of Norton's creep law, which has been used recently to calculate the steady state creep strain rates in a weldment. Failure results are calculated numerically for a ferritic plate of constant thickness subject to uniaxial loading, the plate containing parent and weld metals, type IV material and a high-temperature heat-affected zone (HAZ). Results obtained for various material parameters and weldment configurations show that rupture times depend strongly on the choice of generalized stress in the damage evolution equation. The results also reveal that changes to the material strength of a region cannot be made in isolation if physically realistic results are to be obtained and, further, that early failures can occur if there are large differences in strength between the various parts of the weldment.
This record has no associated files available for download.
More information
Published date: 1996
Identifiers
Local EPrints ID: 29551
URI: http://eprints.soton.ac.uk/id/eprint/29551
ISSN: 0309-3247
PURE UUID: 92d712a5-52e2-4c62-b4ba-5f167d0baad4
Catalogue record
Date deposited: 04 Jan 2007
Last modified: 07 Jan 2022 22:23
Export record
Contributors
Author:
R.E. Craine
Author:
M.G. Newman
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics