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A method for determining material's equivalent stress-strain curve with any axisymmetric notched tensile specimens without Bridgman correction

Tu, Shengwen; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang
Journal article
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URI
http://hdl.handle.net/11250/2577673
Date
2017
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  • Institutt for konstruksjonsteknikk [1576]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
International Journal of Mechanical Sciences. 2018, 135 656-667.   10.1016/j.ijmecsci.2017.12.012
Abstract
Large deformation analyses of problems such as plastic forming, ductile fracture with finite element method need a full range of material's equivalent stress-strain curve or flow stress-strain curve. The equivalent stress-strain curve determined from the smooth round bar specimen should be corrected after diffuse necking, since tri-axial stress state occurs in the neck. The well-known Bridgman correction method is a candidate, however, it is not accurate as the strain increases. Furthermore, it is impossible to measure the equivalent stress-strain curve of each individual material zone in a weldment with cross weld tensile tests. To cope with these challenges, a correction function and an associated test procedure are proposed in this study. With the proposed procedure, the true stress-strain curve from any axisymmetric notched tensile specimen can be converted to the material's equivalent stress-strain curve accurately and no Bridgman correction is needed. The proposed procedure can be applied to both perfectly plastic and strain hardening materials. The equivalent stress-strain curve of each individual material zone in a weldment can also be measured with the proposed procedure.
Publisher
Elsevier
Journal
International Journal of Mechanical Sciences

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