Taken from TAM251 Lecture Notes - L8S17-18

- Axial force and in-plane couple vectors (moments) contribute to the normal stress distribution in the section.
- Shear forces and the twisting couple vector (moment) contribute to the shear stress distribution in the section.

BSM: a summary of steps to solve these problems might be nice to include here. I teach students to tackle these problems by dividing them into 3 steps: 1) find internal forces/moments in a section of interest, 2) calculate all the stresses acting at a specific point within that section, 3) add up like stresses (matching subscripts) to find the total stress state (superposition)