Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (7): 990-993.DOI: 10.12068/j.issn.1005-3026.2016.07.017

• Mechanical Engineering • Previous Articles     Next Articles

Ratcheting Effect of Pressurized Straight Pipe Under Displacement Control

CHEN Xiao-hui1, CHEN Xu2   

  1. 1. School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China; 2. School of Chemical Engineering, Tianjin University, Tianjin 300072, China.
  • Received:2015-04-22 Revised:2015-04-22 Online:2016-07-15 Published:2016-07-13
  • Contact: CHEN Xiao-hui
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Abstract: The ratcheting effect of pressurized straight pipe was studied for nuclear power plant. The effect of internal pressure, displacement and multistep loading on ratcheting strain was mainly studied. The results indicated that ratcheting strain occurs mainly in hoop direction and it′s not evident in axial direction. Ratcheting strain increases with the increasing of displacement at the same pressure. At the same displacement, ratcheting strain increases with the increasing of internal pressure. For multi-step loading, ratcheting strain rate in the next step would be decreased by ratcheting deformation in the preceding step. The effect of ratcheting history at higher level loading on ratcheting strain is larger than that at lower level loading. According to the quasi-three-point-bending apparatus, ratcheting boundary was determined.

Key words: pressurized straight pipe, displacement control, experimental study, ratcheting strain, ratcheting boundary

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