Techno Press


Steel and Composite Structures   Volume 5, Number 5, October 2005, pages 359-374
DOI: http://dx.doi.org/10.12989/scs.2005.5.5.359
 
Viscoplastic response and collapse of 316L stainless steel tubes under cyclic bending
Kao-Hua Chang, Chien-Min Hsu, Shane-Rong Sheu and Wen-Fung Pan

 
Abstract     [Full Text]
    This paper presents the experimental and theoretical results of the viscoplastic response and collapse of 316L stainless steel tubes subjected to cyclic bending. The tube bending machine and curvature-ovalization measurement apparatus, which was designed by Pan et al. (1998), were used for conducting the cyclic curvature-controlled experiment. Three different curvature-rates were controlled to highlight the characteristic of viscoplastic response and collapse. Next, the endochronic theory and the principle of virtual work were used to simulate the viscoplastic response of 316L stainless steel tubes under cyclic bending. In addition, a proposed theoretical formulation (Lee and Pan 2001) was used to simulate the relationship between the controlled cyclic curvature and the number of cycles to produce buckling under cyclic bending at different curvature-rates (viscoplastic collapse). It has been shown that the theoretical simulations of the response and collapse correlate well with the experimental data.
 
Key Words
    viscoplastic response; viscoplastic collapse; 316 L stainless steel tubes; cyclic bending; endochronic theory; moment; curvature; ovalization.
 
Address
Kao-Hua Chang; Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, R.O.C.rnChien-Min Hsu; Department of Art-Craft, Tung Fang Institute of Technology, Kao Hsiung County, Taiwan, R.O.C.rnShane-Rong Sheu; Department of Automation and Control Engineering, Far East College, Tainan, Taiwan, R.O.C.rnWen-Fung Pan; Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, R.O.C.
 

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