The stress equation (for sustained stresses in B31.1) uses "0.75 * i * M / Z" for the bending term. In the CAESAR II stress report, we show the value of "i", which is the SIF as computed according to Appendix D. We are not reporting "0.75 * i". The 0.75 factor is used in the computation of the "code stress", and is a fixed constant that can not be changed.