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Ratcheting behavior of pressurized Z2CND18.12N stainless steel pipe under different control modes

  • Chen, Xiaohui (School of Control Engineering, Northeastern University at Qinhuangdao) ;
  • Chen, Xu (School of Chemical Engineering and Technology, Tianjin University) ;
  • Chen, Gang (School of Chemical Engineering and Technology, Tianjin University) ;
  • Li, Duomin (Guangdong University of Petrochemical Technology)
  • Received : 2013.12.03
  • Accepted : 2014.05.22
  • Published : 2015.01.25

Abstract

With a quasi-three point bending apparatus, ratcheting deformation is studied experimentally on a pressurized austenitic stainless steel Z2CND18.12N pipe under bending load and vertical displacement control, respectively. The characteristic of ratcheting behavior of straight pipe under both control methods is achieved and compared. The cyclic bending loading and internal pressure influence ratcheting behavior of pressurized straight pipe significantly under loading control and the ratcheting characteristics are also highly associated with the cyclic displacement and internal pressure under displacement control. They all affect not only the saturation of the ratcheting strain but the ratcheting strain rate. In addition, ratcheting simulation is performed by elastic-plastic finite element analysis with ANSYS in which the bilinear model, Chaboche model, Ohno-Wang model and modified Ohno-Wang model are applied. By comparison with the experimental data, it is found that the CJK model gives reasonable simulation. Ratcheting boundaries under two control modes are almost same.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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