Secondary objectives are to investigate the effects of pipe size and field welds on the fatigue strength of butt-welded pipe. All testing was conducted by prescribing constant cyclic alternating displacement amplitudes about a zero mean value. Force deflection data were taken so that results could be compared with Markl s stress data. A simple theory for elastic-plastic bending of pipe is developed and described. This theory does no represent and local discontinuity such as a girth butt weld.
Test data is described and theory is compared with the test data.
Publication of this document WRC Bulletin No. 433 was sponsored by the Pressure Vessel Research Council of the Welding Research Council.