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.
Highlights
Steel pipes are widely used in machinery and the marine industry, among other fields [1,2,3,4].They are subjected to internal pressure and a large cyclic bending load, which may incur a ratcheting effect [5]
The hardening rule used in this paper is a nonlinear isotropic/kinematic hardening model which has been implemented in the ABAQUS finite element code [32]
The evolution law of this model consists of two components: a nonlinear kinematic hardening component, which describes the translation of the yield surface in stress space through the back stress, α, and an isotropic hardening component, which describes the change of the equivalent stress defining the size of the yield surface σ0, as a function of plastic deformation [30]
Summary
Steel pipes are widely used in machinery and the marine industry, among other fields [1,2,3,4]. Chen et al [12,13,14] studied the ratcheting behavior of elbow and straight pipes under internal pressure and cyclic loading by experimental and numerical simulation. Liu et al [3] evaluated the thermal effects on the ratcheting behavior of a pressured elbow pipe using the Chen-Jiao-Kim (CJK) kinematic hardening model as a user subroutine of ANSYS. The fatigue-ratcheting behavior of thin-walled carbon steel elbow and tee joint pipes were evaluated under internal pressure and seismic loading through experimental and numerical analysis by Kiran et al [29]. The influence of the clearance between the sleeve and pipe on the ratcheting response was analyzed
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