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Variation of Ovalization for Sharp-Notched Circular Tubes Under Cyclic Bending

Published online by Cambridge University Press:  05 May 2011

K.-L. Lee ,
C.-Y. Hung  and
W.-F. Pan
K.-L. Lee*
Affiliation:
Department of Computer Application Engineering, Far East University, Tainan, Taiwan 74448, R.O.C.
C.-Y. Hung*
Affiliation:
Department of Mechanical Engineering, Military Academy, Kaohsiung, Taiwan 83059, R.O.C.
W.-F. Pan*
Affiliation:
Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
*
* Associate Professor
** Assistant Professor
*** Professor, corresponding author
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Abstract

In this paper, an experimental investigation on the variation of ovalization for sharp-notched circular tubes subjected to cyclic bending is discussed. The tube bending machine and curvature-ovalization measurement apparatus were used to test the unnotched and sharp-notched 304 stainless steel tubes. For sharp-notched tubes, five different notch depths (0.2, 0.4, 0.6, 0.8 and 1.0mm) were considered in this study. It was found that the experimental curve of the ovalization and the number of cycles could be divided into three stages-an initial, secondary and tertiary stage. An empirical relationship was proposed for simulating the aforementioned curve for the initial and secondary stages in this study. It has been shown that the derived empirical relationship was in good agreement with the experimental data.

Keywords

Sharp-notched circular tubesCyclic bendingOvalizationCurvatureNumber of cycles
Type
Articles
Information
Journal of Mechanics , Volume 26 , Issue 3 , September 2010 , pp. 403 - 411
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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