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http://dx.doi.org/10.3795/KSME-A.2017.41.11.1021

Establishment of An Optimal Process to Improve Structural Integrity by Investigating Effect of the Process Variables on Fatigue Lifetime of Steel-Sleeve Repair Welds in Buried Gas Pipeline  

Kim, Jong Sung (Dept. of Nuclear Engineering, Sejong Nat'l Univ.)
Lee, Cheol (Dept. of Nuclear Engineering, Sejong Nat'l Univ.)
Kim, Woo Sik (Research and Development Center, Korea Gas Corporation)
Kim, Ik Jung (Research and Development Center, Korea Gas Corporation)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.11, 2017 , pp. 1021-1033 More about this Journal
Abstract
In this study, an optimum process to improve structural integrity was established by investigating effect of the process variables on fatigue lifetime of steel-sleeve repair welds in buried gas pipeline. Residual stresses in the repair welds were derived through sequentially-coupled temperature-stress analysis using ABAQUS, which is a commercial finite element analysis program. In addition, variations of operating stresses were derived by finite element linear elastic stress analysis. Fatigue lifetimes of the steel-sleeve repair welds were evaluated by substituting the derived weld residual stresses and operating stress variations into the structural stress/fracture mechanics approach as input. Parametric study using finite element analysis and fatigue assessment for various repair welding process variables were carried out to investigate the effects of the process variables on the fatigue lifetime. Finally, based on the effects of the process variables on the fatigue lifetime, an optimal process to minimize the welding time and economic costs and to improve the fatigue lifetimes was derived.
Keywords
Buried Gas Pipeline; Steel-Sleeve Repair Weld; Fatigue Lifetime; Residual Stress; Finite Element Analysis; Structural Stress/Fracture Mechanics Approach;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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