The influence of material anisotropy and friction on ring deformation has been examined in relation to the distribution of normal pressure and frictional shear stress, deformed ring shapes, and estimated errors in the coefficient of friction. Based on the flow rule associated with von Mises’ and Hill’s yield criteria, the analyses have been carried out with the finite element method (FEM) for three cases, namely, (1) an anisotropic ring oriented 90 deg to the axis of rotational symmetrical anisotropy under uniform coefficient of friction; (2) an isotropic ring under frictional anisotropy condition; and (3) an anisotropic ring oriented 0 deg to the axis of rotational symmetrical anisotropy under uniform coefficient of friction. In the first two cases, the results show that the influence of anisotropy on ring deformation is quite similar to that obtained by changing the frictional condition. Therefore, in the third case, if the anisotropic behavior is mistakenly attributed to friction, the possible estimated error for the coefficient of friction can be as high as 80 percent for a pronounced anisotropic material. Deformed ring shapes have been verified in experiments using the extruded annealed aluminum alloy AA6082 (Al-Si1Mg0.9Mn0.1).
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July 2002
Technical Papers
Influence of Material Anisotropy and Friction on Ring Deformation
Han Han
Han Han
Materials Forming, Department of Production Engineering, Royal Institute of Technology, 100 44 Stockholm, Sweden
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Han Han
Materials Forming, Department of Production Engineering, Royal Institute of Technology, 100 44 Stockholm, Sweden
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division May 22, 2001; revised manuscript received January 29, 2002. Associate Editor: A. A. Lubrecht.
J. Tribol. Jul 2002, 124(3): 637-644 (8 pages)
Published Online: May 31, 2002
Article history
Received:
May 22, 2001
Revised:
January 29, 2002
Online:
May 31, 2002
Citation
Han, H. (May 31, 2002). "Influence of Material Anisotropy and Friction on Ring Deformation ." ASME. J. Tribol. July 2002; 124(3): 637–644. https://doi.org/10.1115/1.1473144
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