A key influence factor in the strain-based assessment of pipeline girth weld flaws is weld strength mismatch. Recent research has led to a framework for tensile strain capacity as a function of weld flow stress (FS) overmatch. This framework is built around three parameters: the strain capacity of an evenmatching weldment, the sensitivity of strain capacity to weld FS overmatch, and the strain capacity at gross section collapse (GSC). A parametric finite element study of curved wide plate (CWP) tests has been performed to identify the influence of various characteristics on each of these three parameters. This paper focuses on flaw depth, tearing resistance of the weld, stress–strain behavior of the base metal, and weld geometry. Influences of these characteristics are mostly found to be limited to one or two of the three framework parameters. A preliminary structure is proposed for equations that further develop the strain capacity framework.
Framework for Key Influences on Tensile Strain Capacity of Flawed Girth Welds
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 22, 2013; final manuscript received January 7, 2015; published online February 23, 2015. Assoc. Editor: Hardayal S. Mehta.
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Hertelé, S., Denys, R., Horn, A., Van Minnebruggen, K., and De Waele, W. (August 1, 2015). "Framework for Key Influences on Tensile Strain Capacity of Flawed Girth Welds." ASME. J. Pressure Vessel Technol. August 2015; 137(4): 041409. https://doi.org/10.1115/1.4029589
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