This does not automatically dictate a gage increase - stress analysis and FE results, and particularily fatigue considerations rule this world. The thinning is typically localized over an area along the outer radius. The comments regarding strain hardening are very appropriate - not to mention the thinning that occurs can easily exceed 30%. I've had some interesting personal dialogue with Rodabaugh regarding this very subject. We look to codes for SIF values and other general guidance, such as local flange influence on stiffnesses, etc. Typical line sizes are from 1.5" dia to 6.00" dia, with nominal wall thickness of. This is a region far away from BPV code work, etc, with D/t ratios from 62 to over 400. Many of these are in Inco alloys and comm pure titanium, with gages from. I work for an aerospace pneumatics system supplier and we routinely design for and manufacture swept mandrel bends in 1.5-D and 1.0-D configurations.
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