Experimental analysis on the viscoplastic behavior of sharp-notched 304 stainless steel tubes with different notch depths under cyclic bending

Chao Yu Hung, Kuo Long Lee, Wen Fung Pan

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2 Citations (Scopus)

Abstract

This paper presents an experimental investigation of the mechanical behavior and buckling failure (viscoplastic behavior) of 304 stainless steel tubes with five different sharp-notched depths (0.2, 0.4, 0.6, 0.8 and 1.0 mm) subjected to cyclic bending with three different curvature-rates (0.0035, 0.035 and 0.35 m -1s -1). A tube bending machine and curvature-ovalization measurement apparatus were used to control, measure and collect experimental data. It can be observed from the experiment data that the 304 stainless steel tube with any notch depth exhibits a cyclic hardening phenomenon from the moment and curvature relationship, and a steady-state loop of the moment-curvature curve is found after a few loading cycles. It can also be observed that the relationship between the ovalization and curvature demonstrates a nonsymmetric, ratcheting phenomenon. Higher notch depth leads to further nonsymmetry of the curve. It can be observed from the experimental curvature-number of cycles to produce buckling curves that five almost parallel straight lines can be found for five different sharp-notched depths at each curvature-rate in a log-log scale. Finally, by referring to the theoretical formulations proposed by Shaw and Kyriakides [1], and Pan and Her [2], a theoretical formulation was proposed to simulate the relationship between the controlled curvature and the number of cycles to produce buckling for 304 stainless steel tubes with different sharp-notched depths at different curvature-rates. By comparing theoretical analysis with experimental data, it is shown that the theoretical formulation can properly represent the experimental results.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalJournal of Technology
Volume26
Issue number4
Publication statusPublished - 2011 Dec

All Science Journal Classification (ASJC) codes

  • General Engineering

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