A Quantitative Non-destructive Residual Stress Assessment Tool for Pipelines

Mechanical damage, including dents, bends, wrinkles, and other forms, is the leading cause of all pipeline failures. The mechanically damaged regions act as fatigue crack initiation sites under cyclic loading (present for in-service pipelines). Crack initiation is the first stage of the appearance of fatigue cracking, which becomes much easier to initiate in the presence of damage because of the locally enhanced strain/stress field around the flaw. The damage and residual stresses lower the overall fatigue strength of the steel and its weldments. The size and shape of the flaw actually determines the level of stress necessary for crack initiation and propagation. Determining and detecting the limits of critical damage severity is essential to mitigating crack initiation and, therefore, mitigating fast crack propagation before failure.

• Record URL:
  http://primis.phmsa.dot.gov/matrix/prjHome.rdm?prj=441
• Supplemental Notes:
  • Program information: Pipeline Safety Research. Link to project report: http://ntl.bts.gov/lib/54000/54100/54184/G2MT_Phase_II_Final_Report.pdf

Language

• English

Project

• Status: Completed
• Funding: $1000000.00
• Contract Numbers:

  DTPH56-12-V-000007

• Sponsor Organizations:

  Pipeline and Hazardous Materials Safety Administration

  U.S. Department of Transportation
  East Building, 2nd Floor 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Merritt, James

• Performing Organizations:

  Generation 2 Materials Technology LLC

  1626 S. Cherry Street
  Tomball, TX  United States  77375
• Principal Investigators:

  Lasseigne, Angelique

• Start Date: 20120914
• Expected Completion Date: 0
• Actual Completion Date: 20140913
• Source Data: RiP Project 35463

Subject/Index Terms

• TRT Terms: Cracking; Inspection; Nondestructive tests; Pipelines; Residual stress
• Subject Areas: Design; Maintenance and Preservation; Pipelines;

Filing Info

• Accession Number: 01573204
• Record Type: Research project
• Source Agency: Department of Transportation
• Contract Numbers: DTPH56-12-V-000007
• Files: RiP
• Created Date: Aug 14 2015 1:00AM