Characterization and Calculation of Fracture Toughness for High Grade Pipes

• Author / Creator

  student, Cen Cheng

• The classical Battelle two-curve method is proved to be non-conservative in calculating the arrest fracture toughness of high grade line pipes. In this thesis, first, the concept of ―limit (crack) speed‖ is introduced to the existing two-curve method, which leads to a modified two-curve method (LS-TCM) that could give more accurate calculation of fracture toughness in some cases for both low and high grade pipes. Several other new ideas and approaches are also proposed to calculate fracture toughness of all grade pipes, and their applicability for high grade pipes is discussed with comparison to available known data. Some comments are given about how to choose an appropriate formula to calculate fracture toughness for high grade pipes. Finally, the relationship between the three basic parameters for characterizing fracture toughness, CVN, DWTT and CTOA, is also discussed, in order to give designers helpful advice about how to choose the parameters to characterize fracture toughness of line pipes.

• Subjects / Keywords

  • High grade pipes
  • Fracture toughness

• Graduation date

  Spring 2013

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3V42R

• 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.