Portion of primary stress proportional to the distance from the centroid of a cross-section, excluding the effects of discontinuities and stress concentrations. NOTE Definition taken from API 2RD.
Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global Standards
Source: API SPEC 17L1, Specification for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global Standards
A bending stress is a stress induced by a bending moment. It varies linearly with the distance from the centroid of the section and is calculated using the classical mechanics equation for bending stress (S = Mc/I).
Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards