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Metals 2017, 7(3), 100; doi:10.3390/met7030100

Investigation of the Geometry of Metal Tube Walls after Necking in Uniaxial Tension

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
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Received: 10 February 2017 / Revised: 5 March 2017 / Accepted: 14 March 2017 / Published: 17 March 2017
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Abstract

Abstract: In order to characterize the deformation and true stress–strain relation of metal tubes, the geometry of tube walls after necking in uniaxial tension need to be determined. The paper investigated the necking process of metal tube. A large number of tensile tests and finite element analysis of 1Cr18Ni9Ti tubes with different sizes were conducted. It was found that the geometry of outer tube wall in the necking region can be described using a logistic regression model. The final geometry of the tube is determined by original tube diameter and wall thickness. The offset of tube walls are affected by two competing factors: volume constancy and necking. The offset distances of outer and inner walls are mainly affected by original wall thickness. The length of the necking zone is more influenced by original tube diameter. Tube elongation at fracture increases slightly as tube diameter gets larger, while the wall thickness has almost no impact on the elongation.
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Keywords: tube tension; necking; surface profile; tube diameter; wall thickness tube tension; necking; surface profile; tube diameter; wall thickness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, C.; E, D.; Zhang, J.; Yi, N. Investigation of the Geometry of Metal Tube Walls after Necking in Uniaxial Tension
. Metals 2017, 7, 100.

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