Ratcheting Simulation of a Steel Pipe with Assembly Parts under Internal Pressure and a Cyclic Bending Load

Abstract

The ratcheting behavior of a steel pipe with assembly parts was examined under internal pressure and a cyclic bending load, which has not been seen in previous research. An experimentally validated and three dimensional (3D) elastic-plastic finite element model (FEM)-with a nonlinear isotropic/kinematic hardening model-was used for the pipe's ratcheting simulation and considered the assembly contact effects outlined in this paper. A comparison of the ratcheting response of pipes with and without assembly parts showed that assembly contact between the sleeve and pipe suppressed the ratcheting response by changing its trend. In this work, the assembly contact effect on the ratcheting response of the pipe with assembly parts is discussed. Both the assembly contact and bending moment were found to control the ratcheting response, and the valley and peak values of the hoop ratcheting strain were the transition points of the two control modes. Finally, while the clearance between the sleeve and the pipe had an effect on the ratcheting response when it was not large, it had no effect when it reached a certain value.

Examining the hysteresis loop of the SS316L U-shaped pipe considering ratcheting behavior

“…In 2020, Rahmatfam et al used the numerical and experimental methods simultaneously to examine the impact of some parameters on the ratcheting response of tubes subjected to cyclic axial loading [23]. Using the nite element method (FEM) and a nonlinear isotropic/kinematic hardening model, the ratcheting phenomenon in the steel pipe subjected to the internal pressure and a cyclic bending load with assembly parts was investigated by Rahmatfam et al in 2019 [24]. Using a novel numerical analysis, the mechanical behavior of steel pipe elbows under severe cyclic loads was examined by Chatzopoulou and Karamanos in 2020 [25].…”