Cyclic Bending Failure of Local Sharp-Notched Circular Tubes with Different Diameter-to-Thickness Ratios

Research Area: Volume 7,Issue 3, May 2018 Year: 2018
Type of Publication: Article Keywords: Different Diameter to thickness Ratios, Local Sharp notched 6061 T6 Aluminum Alloy Tubes, Cyclic Bending, Number of Cycles Required to Ignite Failure
Authors:
  • Kuo-Long Lee
  • Wen-Fung Pan
Journal: IJEIR Volume: 7
Number: 3 Pages: 166-174
Month: May
ISSN: 2277-5668
Abstract:
In this study, the failure of local sharp-notched 6061-T6 aluminum alloy tubes with different diameter-to-thickness ratios submitted to cyclic bending are studied. Different diameter-to-thickness ratios of 16.5, 31.0 and 60.0 were considered. The notch depths of tubes were considered from very small to about 0.6 times the tube’s wall thickness. From the experimental moment-curvature relationship, it demonstrated a steady loop from the beginning of the first bending cycle. From the experimental ovalization-curvature relationship, it exhibited an increasing and ratcheting manner along with the number of bending cycles. The larger notch depth led to more asymmetrical ovalization-curvature relationship and the greater increase of the ovalization. Furthermore, for a certain diameter-to-thickness ratio, five unparallel straight lines corresponding to five different notch depths were found for the controlled curvature-number of cycles required to ignite failure relationship on a log-log scale. Finally, a theoretical model was proposed for simulating the aforementioned relationship. Through comparison with the experimental data, the model can properly simulate the experimental findings

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