局部凹痕圓管之循環彎曲退化與失效

Translated title of the contribution: Cyclic Bending Deterioration and Failure of Locally-dented Circular Tubes

Kuo Long Lee, Chen Cheng Chung, Wen Fung Pan

Research output: Contribution to journalArticlepeer-review

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 produce 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 an increase in asymmetry and ratcheting with an increase in the number of bending cycles. Deeper dent depths caused larger ovalization. Tubes with five different dent depths were tested. The relationship between the controlled curvature and number of bending cycles required to produce failure on a log-log scale exhibited five nonparallel 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 agreed well.

Translated title of the contributionCyclic Bending Deterioration and Failure of Locally-dented Circular Tubes
Original languageChinese (Traditional)
Pages (from-to)53-63
Number of pages11
JournalJournal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
Volume39
Issue number1
Publication statusPublished - 2018 Feb 1

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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