CLOSED FORM SOLUTIONS FOR INELASTIC CYCLIC BENDING OF STEEL TUBULARS USING CONTINUOUS STRESS-STRAIN MODEL

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MOTAMEDI MOHAMMAD; Zeinoddini Mostafa; FAKHERI JAVAD

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Journal: Modares Mechanical Engineering Year:2017 | Volume:16 | Issue:12 Page(s): 756-766

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Title

CLOSED FORM SOLUTIONS FOR INELASTIC CYCLIC BENDING OF STEEL TUBULARS USING CONTINUOUS STRESS-STRAIN MODEL

Author(s)

MOTAMEDI MOHAMMAD | Zeinoddini Mostafa | FAKHERI JAVAD | Issue Writer Certificate

Keywords

STEEL CIRCULAR TUBULARQ1

MONOTONIC AND CYCLIC INELASTIC PURE BENDINGQ1

CYCLIC SOFTENING/ HARDENING BEHAVIORQ1

Abstract

The current paper deals with the cyclic softening/hardening and strain ratcheting behavior of circular steel tubes under repeated inelastic pure bending. A relatively simple mathematical solution is proposed to tackle the problem. Key physical features involved are the elastic after-effect, accumulated cyclic (creep type) ovalisation of the cross-section, cyclic plasticity including the Bauschinger effect, cyclic softening/hardening of the material and ratcheting effect. The moment-curvature formulation of the tube is derived in an ovalised configuration. Tvergaard stress-strain relation is used to describe the elastoplastic stress–strain relationship of the material. This continuous nonlinear constitutive model considerably abridges the solution. A combined nonlinear kinematic/nonlinear isotropic hardening rule is used to describe the cyclic uniaxial stress-strain. The analysis of the low cycle pure inelastic bending of the tube is performed under a curvature-control regime. The cycle by cycle growth (creep type) in the ovalization of the cross-section is modeled using a modified version of the Bailey–Norton creep law.The model predictions are examined against a number of available test data on the inelastic monotonic and cyclic bending of tubes and reasonable agreements are observed.

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APA: Copy

MOTAMEDI, MOHAMMAD, Zeinoddini, Mostafa, & FAKHERI, JAVAD. (2017). CLOSED FORM SOLUTIONS FOR INELASTIC CYCLIC BENDING OF STEEL TUBULARS USING CONTINUOUS STRESS-STRAIN MODEL. MODARES MECHANICAL ENGINEERING, 16(12 ), 756-766. SID. https://sid.ir/paper/178145/en

Vancouver: Copy

MOTAMEDI MOHAMMAD, Zeinoddini Mostafa, FAKHERI JAVAD. CLOSED FORM SOLUTIONS FOR INELASTIC CYCLIC BENDING OF STEEL TUBULARS USING CONTINUOUS STRESS-STRAIN MODEL. MODARES MECHANICAL ENGINEERING[Internet]. 2017;16(12 ):756-766. Available from: https://sid.ir/paper/178145/en

IEEE: Copy

MOHAMMAD MOTAMEDI, Mostafa Zeinoddini, and JAVAD FAKHERI, “CLOSED FORM SOLUTIONS FOR INELASTIC CYCLIC BENDING OF STEEL TUBULARS USING CONTINUOUS STRESS-STRAIN MODEL,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 12 , pp. 756–766, 2017, [Online]. Available: https://sid.ir/paper/178145/en

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