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High Strength Steel Pipelines, Local Buckling, Critical Buckling Strain

Fathi, Ali

Supervisor and department: Cheng, Rojer Civil and Environmental Engineering, University of Alberta

Examining committee member and department: Mohareb, Magdi Civil and Environmental Engineering, University of Ottowa Cheng, Rojer Civil and Environmental Engineering, University of Alberta Adeeb, Samer Civil and Environmental Engineering, University of Alberta Ru, Chong-Qing Mechanical Engineering, University of Alberta Driver, Robert Civil and Environmental Engineering, University of Alberta

Department: Department of Civil and Environmental Engineering

Specialization: Structural Engineering

Date accepted: 2012-09-26T13:08:53Z

Graduation date: 2012-09

Degree: Doctor of Philosophy

Degree level: Doctoral

Abstract: This research investigates the buckling response of high strength steel HSS pipes with anisotropic material properties. The stress-strain responses of eight material types of grades X80 and X100 pipes were studied focusing on the elastic, yielding, and early plastic regions that affect the pipe’s buckling. Based on the observed hardening patterns in longitudinal and transverse directions, a combined hardening material model was introduced with linear isotropic and Armstrong-Frederick kinematic hardening rules. A simple method for model calibration was also introduced using longitudinal and transverse tensile stress-strain responses.After validation with experimental stress-strain data, the anisotropic material model was used in the buckling analyses of HSS pipes to improve the accuracy of finite element simulations. Fifteen finite element models were developed for buckling analyses of HSS pipes previously tested under different load combinations. The results showed that using the anisotropic material model results in more precise simulations of the actual behaviour of HSS pipes compared to isotropic models.The anisotropic model was employed in a parametric study to investigate the effects of material anisotropy and five other parameters on the critical buckling strain of HSS pipes. Finite element models were developed and analyzed with different values of diameter to thickness ratio, internal pressure, initial imperfection, material grade, strain hardening rate, and level of anisotropy. The results provide a better understanding of the effects of material properties on the buckling resistance of HSS pipes when there is a significant level of anisotropy.

Language: English

DOI: doi:10.7939-R3471W

Rights: Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.





Autor: Fathi, Ali

Fuente: https://era.library.ualberta.ca/


Introducción



University of Alberta Effects of Material Anisotropy on the Buckling Resistance of High Strength Steel Pipelines by Ali Fathi A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Structural Engineering Department of Civil and Environmental Engineering ©Ali Fathi Fall 2012 Edmonton, Alberta Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only.
Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the authors prior written permission. ABSTRACT This research investigates the buckling response of high strength steel (HSS) pipes with anisotropic material properties.
The stress-strain responses of eight material types of grades X80 and X100 pipes were studied focusing on the elastic, yielding, and early plastic regions that affect the pipe’s buckling.
Based on the observed hardening patterns in longitudinal and transverse directions, a combined hardening material model was introduced with linear isotropic and ArmstrongFrederick kinematic hardening rules.
A simple method for model calibration was also introduced using longitudinal and transverse tensile stress-strain responses. After validation with experimental stress-strain data, the anisotropic material model was used in the buckling analyses of HSS pipes to improve the accuracy of finite element simulations.
Fifteen finite element models were developed for buckling analyses of HSS pi...





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