Detailed thermo-mechanical residual stress analysis was performed for an idealized multi-pass butt weld, representing the middle butt-girth weld of a storage tank. The analysis procedures took into account representative welding parameters, joint detail, weld pass deposition sequence, as well as temperature-dependent properties. The predicted residual stresses were mapped onto a 3-D finite elernent alternating model for calculating the stress intensity factors. Both longitudinal and transverse cracks with respect to the weld orientation were considered with crack size (2a) varying from 0.4 to 10 inches. The major findings can be summarized as follows: Both transverse and longitudinal residual stresses are tensile near the surfaces. The transverse residual stresses become highly compressive near the mid-thickness while the longitudinal residual stresses reduce to near zero at the mid-thickness. As far as longitudinal residual stresses are concerned, the magnitudes near both surfaces exceed the yield strengths of the respective materials (i.e., A285 and E6010), depending on the locations of the material regions of concern. As for transverse residual stresses, the highest tensile value (above the base material yield strength) occurs near the inner surface, while the value at the outer surface is about half of that at the inner surface. Stress intensity factors c.aiculated for the transverse crack showed an initial rapid drop from about 50 ksi*in(exp1/2) to 20 ksi*in(exp1/2) as the crack size (2a) increases from 0.4 to 2 inches and a gradual decrease to zero as the crack size approaches approximately 8 inches.
Stress intensity factor solutions for welded joints subjected to weld residual stresses
Spannungsintensitätsfaktor-Lösungen für schweißrestspannungsbehaftete Schweißnähte
2001
13 Seiten, 10 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
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