Localisation of plastic deformation in friction stir and electron beam copper welds

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Abstract

Optical strain measurement through digital image correlation during tensile testing was utilised to study the effect of strain rate and welding defects on localisation of plastic deformation in friction stir welded and electron beam welded phosphorous-alloyed oxygen-free copper. Welds cut from fullsize nuclear waste copper canisters and additionally made defective welds were studied. Optical strain measurement represents a new way of studying deformation of materials and obtaining local material data. The data was used to construct strain maps and estimate local true stress–strain curves. Using Gini oefficients to quantify strain localisation, it appears that the lower strain rate resulted in slightly faster localisation of plastic deformation with lower stress level.

Details

Original languageEnglish
Pages (from-to)1119-1129
JournalMaterials Science and Technology
Volume33
Issue number9
Early online date12 Oct 2016
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

ID: 9599431