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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Kočí, Jan | Prague |
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| Azam, Siraj |
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Forsey, Alexander
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Publications (7/7 displayed)
- 2022Creep deformation measurement of ex‐service 12% Cr steel over nonuniform stress fields using digital image correlationcitations
- 2021Stress driven creep deformation and cavitation damage in pure coppercitations
- 2018The influence of temperature on deformation-induced martensitic transformation in 301 stainless steelcitations
- 2018Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatmentcitations
- 2017Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlationcitations
- 2016<i>In situ</i> observation of strain and phase transformation in plastically deformed 301 austenitic stainless steelcitations
- 2014A new method for quantifying anisotropic martensitic transformation strains accumulated during constrained coolingcitations
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article
Stress driven creep deformation and cavitation damage in pure copper
Abstract
The stress dependence of creep deformation and cavitation damage in pure copper at 250 °C under uniaxial loading is studied using a flat hourglass test specimen under uniaxial tensile load. In-situ digital image correlation (DIC) is used to monitor time dependent surface creep deformation, ex-situ small angle neutron scattering (SANS) applied to measure volumetric cavitation damage, and scanning electron microscopy used for surface characterisation. A self-consistent discolation model is successfully applied to explain the full field multi-stress creep deformation behaviour measured by DIC. Through approximating a range of shaped cavities with a model distribution of spherical voids, a minimum stable cavity nucleation diameter range of 600 to 1200 Å, depending on the applied stress level, is clearly observed in the SANS results. This finding supports the validity of the classical surface energy/work balance expression defining the minimum stable cavity size. All cavities observed in interrupted life samples were facetted in nature. The SANS data imply continuous cavity nucleation and growth throughout creep life, with a nucleation rate at stresses less than 100 MPa linearly related to the creep rate. This is in accordance with the double ledge grain boundary sliding nucleation model of Sandström and Wu [1].