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Title: Accurate prediction of burst pressure for linepipes
Category: Technical papers from the Journal of Pipeline Integrity
Downloadable: Yes 
Catalog No.: 2063
Date of Publication: Fourth Quarter, 2004
Price: $25.00 US
Authors: Dr Xian-Kui Zhu & Dr Brian N Leis
Abstract: Accurate prediction of the burst pressure of linepipes is essential for the safety design and integrity assessment of transmission pipelines. Different analytical and empirical formulae for determining the limit load of defect-free pipes have been proposed, but there are none extensively valid or commonly accepted. Many experimental results have shown that analytical predictions that are based on the plastic instability theory and the von Mises (or Tresca) yield criterion overestimate (or underestimate) the burst pressures of pressurized defect-free pipes, and generally are the upper (or lower) bound of the burst pressure for linepipes. To accurately predict experimental data, a new yield criterion, referred to as the average shear-stress criterion, is developed in this paper. Based on this yield criterion, a new analytical solution of failure pressure at plastic collapse is formulated as a function of pipe geometry, the yield-to-tensile stress ratio (Y/T), and the ultimate tensile stress of materials. The proposed model is then validated by detailed finite-element results and extensive full-scale experimental data. Comparisons indicate that the present solution matches the numerical results very well, and can accurately predict the average experimental data for defect-free pipes with various pipeline steel grades.
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