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

• Author / Creator

  Fathi, Ali

• 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.

• Subjects / Keywords

  • Local Buckling
  • High Strength Steel Pipelines
  • Critical Buckling Strain

• Graduation date

  Fall 2012

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/R3471W

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.