TY - JOUR
T1 - Cyclic bending degradation and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios
AU - Lee, Kuo Long
AU - Yu, Shu Fei
AU - Chen, Yu An
AU - Pan, Wen Fung
N1 - Funding Information:
The work presented was carried out with the support of the Ministry of Science and Technology under grant MOST 105-2221-E-006-073. Its support is gratefully acknowledged.
Publisher Copyright:
© 2019, National Taiwan University of Science and Technology. All rights reserved.
PY - 2019
Y1 - 2019
N2 - In this paper, the degradation and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios subjected to cyclic bending were investigated. Three different diameter-to-thickness ratios of 16.5, 31.0 and 60.0 were considered. For smaller diameter-to-thickness ratios, the moment-curvature relationship rapidly became a steady loop from the first bending cycle. The dent depth had almost no influence on the moment-curvature relationship. As for the ovalization-curvature relationship, it exhibited an increasing and ratcheting way along with the number of bending cycles. A larger dent depth in the tube caused a larger ovalization. Moreover, a larger dent depth led to a more asymmetrical appearance of the ovalization-curvature relationship. In addition, for a certain diameter-to-thickness ratio, five non-parallel straight lines corresponding to five different dent depths were discovered for the controlled curvature-number of cycles required to ignite a failure relationship on a log-log scale. Finally, a theoretical model was proposed in this study for simulating the aforementioned relationship. It was found that the experimental and simulated results agreed well.
AB - In this paper, the degradation and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios subjected to cyclic bending were investigated. Three different diameter-to-thickness ratios of 16.5, 31.0 and 60.0 were considered. For smaller diameter-to-thickness ratios, the moment-curvature relationship rapidly became a steady loop from the first bending cycle. The dent depth had almost no influence on the moment-curvature relationship. As for the ovalization-curvature relationship, it exhibited an increasing and ratcheting way along with the number of bending cycles. A larger dent depth in the tube caused a larger ovalization. Moreover, a larger dent depth led to a more asymmetrical appearance of the ovalization-curvature relationship. In addition, for a certain diameter-to-thickness ratio, five non-parallel straight lines corresponding to five different dent depths were discovered for the controlled curvature-number of cycles required to ignite a failure relationship on a log-log scale. Finally, a theoretical model was proposed in this study for simulating the aforementioned relationship. It was found that the experimental and simulated results agreed well.
UR - http://www.scopus.com/inward/record.url?scp=85073771949&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073771949&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:85073771949
SN - 1012-3407
VL - 34
SP - 123
EP - 133
JO - Journal of Technology
JF - Journal of Technology
IS - 3
ER -