Paper Title:
Analysis of Axial Subcritical Crack Propagation in X80 Pipeline using Micro-Mechanical Model
  Abstract

This study provides an engineering application of a continuum damage model to analyze the ductile tearing of axial surface cracks in X80 pipelines. Compact tension experiments were conducted to examine the behavior of large crack extension of X80 pipeline steel. The test results were used to verify the optimized parameter set of the proposed damage model. In the numerical model, progressive damage was restricted within a predetermined fracture process zone (FPZ). The material’s damage behavior in FPZ was described in terms of the Gurson–Tvergaard-Needleman (GTN) micro-mechanical damage model. The measured load versus load line displacement curve of CT specimens was numerically predicted using the damage model developed. T* integral was calculated to determine the limiting crack size in X80 pipelines. The damage model was then used to analyze the axial subcritical crack extension. It can help Leak-Before-Break (LBB) assessment.

  Info
Periodical
Advanced Materials Research (Volumes 291-294)
Chapter
Mechanical Behavior & Fracture
Edited by
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
Pages
1183-1189
DOI
10.4028/www.scientific.net/AMR.291-294.1183
Citation
B. W. Qiu, Z. X. Yuan, G. F. Zhou, "Analysis of Axial Subcritical Crack Propagation in X80 Pipeline using Micro-Mechanical Model", Advanced Materials Research, Vols. 291-294, pp. 1183-1189, 2011
Online since
July 2011
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Price
$32.00
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