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Steel and Composite Structures
  Volume 18, Number 1, January 2015 , pages 29-50

Ratcheting behavior of pressurized Z2CND18.12N stainless steel pipe under different control modes
Xiaohui Chen, Xu Chen, Gang Chen and Duomin Li

    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.
Key Words
    ratcheting; cyclic loading; cyclic displacement; loading history; pressure piping
(1) Xiaohui Chen:
School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China;
(2) Xiaohui Chen, Xu Chen, Gang Chen:
School of Chemical Engineering and Technology, Tianjin University, 300072, China;
(3) Duomin Li:
Guangdong University of Petrochemical Technology, Maoming 525000, China.

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