Cyclic bending degradation and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios

Kuo Long Lee, Shu Fei Yu, Yu An Chen, Wen Fung Pan

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)123-133
Number of pages11
JournalJournal of Technology
Volume34
Issue number3
Publication statusPublished - 2019 Jan 1

Fingerprint

Aluminum alloys
Degradation

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

@article{7516e116748e4d08bef18bd7a47a5ebb,
title = "Cyclic bending degradation and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios",
abstract = "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.",
author = "Lee, {Kuo Long} and Yu, {Shu Fei} and Chen, {Yu An} and Pan, {Wen Fung}",
year = "2019",
month = "1",
day = "1",
language = "English",
volume = "34",
pages = "123--133",
journal = "Journal of Technology",
issn = "1012-3407",
publisher = "National Taiwan University of Science and Technology",
number = "3",

}

Cyclic bending degradation and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios. / Lee, Kuo Long; Yu, Shu Fei; Chen, Yu An; Pan, Wen Fung.

In: Journal of Technology, Vol. 34, No. 3, 01.01.2019, p. 123-133.

Research output: Contribution to journalArticle

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

PY - 2019/1/1

Y1 - 2019/1/1

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

VL - 34

SP - 123

EP - 133

JO - Journal of Technology

JF - Journal of Technology

SN - 1012-3407

IS - 3

ER -