|
CSME 2018/02
Volume 39 No.1
:
53-63
|
|
Cyclic Bending Deterioration and Failure of Locally dented Circular Tubes
Kuo-Long Leea, Chen-Cheng Chung b and Wen-Fung Panb
aDepartment of Innovative Design and Entrepreneurship Management, Far East University, Tainan, Taiwan 744, ROC.
bDepartment of Engineering Science, National Cheng Kung University, Tainan, Taiwan 701, ROC.
|
Abstract:
In this paper, we present an experiment and an analysis method for inspecting the deterioration and failure of locally dented 6061 T6 aluminum alloy tubes under cyclic bending. A simple technique was employed to pro duce small transverse local dents on the tubes. Tubes with dent depths varying from very shallow to approximately 2.4 times the tube wall thickness were considered. The ovalization-curvature curve showed a n increase in asymmetry and ratcheting with an increase in the number of bending cycles. Deeper dent depth s caused larger ovalization. Tubes with five different dent depth s were tested. T he relationship between the controlled curvature and number of bending cycles required to produce failure o n a log log scale exhibited five non parallel straight lines . Finally, a finite element model was used to describe the moment-curvature and ovalization-curvature relationship. In addition, an empirical formula was suggested to simulate the relationship between the controlled curvature and number of bending cycles required to produce failure . It was found that the experimental and analytical data agree d well.
|
|
Keywords: cyclic bending deterioration, cyclic bending failure , local dented circular tubes, finite element analysis analysis.
|
Download PDF
|
|
*Corresponding author; e-mail:
|
©
2018
CSME , ISSN 0257-9731
|