Neutron Stress Imaging of Drawn Copper Tube: Comparison with Finite-Element Model |
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Authors: | T Pirling A Carradò S Brück H Palkowski |
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Affiliation: | (1) Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France;(2) Institut de Physique et Chimie des Matériaux de Strasbourg, 67034 Strasbourg Cedex 2, France;(3) Institute of Metallurgy, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany |
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Abstract: | Seamless tubes are used for various mechanical applications, often produced by several cold drawing steps to reach the required
dimensions. The first process step, for example, extrusion or rolling, typically results in ovality and eccentricity of the
tube caused by nonsymmetric material flow and being present during the cold drawing process, i.e., no homogeneous deformation. Because of this nonsymmetrical deformation, and deviations over the length of the tube caused
by moving tools, this process step generates inhomogeneous residual stresses. To understand the interconnection between geometrical
changes in the tubes and the resulting residual stresses, the residual strain distribution in a copper tube was measured by
neutron diffraction. The aim of this study is to evaluate residual stresses generated during cold drawing of copper tubes.
This research comprises experimental measurements and numerical analysis. An industrially produced copper tube was cold drawn,
and the profile of residual strain over circumference and across wall thickness was measured by neutron diffraction. In parallel,
a three-dimensional finite-element model (FEM) was developed to calculate the residual macrostress state generated by the
forming process. Good agreement between experimental results and numerical computations was obtained.
This article is based on a presentation given in the symposium entitled “Neutron and X-Ray Studies for Probing Materials Behavior,”
which occurred during the TMS Spring Meeting in New Orleans, LA, March 9–13, 2008, under the auspices of the National Science
Foundation, TMS, the TMS Structural Materials Division, and the TMS Advanced Characterization, Testing, and Simulation Committee. |
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