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The Influence of Diameter-to-Thickness Ratios on the Response and Collapse of Sharp-Notched Circular Tubes under Cyclic Bending

Published online by Cambridge University Press:  09 August 2012

K.-L. Lee ,
C.-M. Hsu  and
W.-F. Pan
K.-L. Lee
Affiliation:
Department of Computer Application Engineering, Far East University, Tainan County, Taiwan 74448, R.O.C.
C.-M. Hsu
Affiliation:
Department of Interior Design, Tung Fang Design University, Kaohsiung, Taiwan 82941, R.O.C.
W.-F. Pan*
Affiliation:
Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
*
*Corresponding author ([email protected])
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Abstract

This paper discusses an experimental investigation of the behavior of sharp-notched circular tubes subjected to cyclic bending. The sharp-notched circular tubes of 304 stainless steel with three different diameter-to-thickness ratios (Do / t) were tested under symmetric curvature-controlled cyclic bending. It has been shown that the moment-curvature curves exhibited the loops with cyclic hardening and gradually becoming steady after a few cycles for all tested tubes. The ovalization-curvature curves revealed unsymmetric, ratcheting and increasing behavior with the number of cycles. In addition, five almost parallel lines corresponding to five different notch depths for each Do / t ratio were found from the experimental relationship between the cyclic controlled curvature and the number of cycles necessary to produce buckling on a log-log scale. Finally, an empirical relationship was proposed so it could be used for simulating the aforementioned relationship. By comparing with the experimental finding, the derived empirical relationship was in good agreement with the experimental data.

Keywords

Sharp-notched circular tubesDiameter-to-thickness ratiosCyclic bendingMomentCurvatureOvalizationCollapse
Type
Articles
Information
Journal of Mechanics , Volume 28 , Issue 3 , September 2012 , pp. 461 - 468
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2012

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References

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