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Effects of Material Anisotropy on the Buckling Resistance of High Strength Steel Pipelines Open Access


Other title
High Strength Steel Pipelines
Local Buckling
Critical Buckling Strain
Type of item
Degree grantor
University of Alberta
Author or creator
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 of Civil and Environmental Engineering
Structural Engineering
Date accepted
Graduation date
Doctor of Philosophy
Degree level
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.
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