Computes the safety factor at a particular point along the length of a member with hollow cylindrical cross section, given the internal force and moment at the point.
Computes the safety factor at a particular point along the length of a member with hollow cylindrical cross section, given the internal force and moment at the point. 'axis' is perpendicular to the cross section; 'od' is the outer diameter, 'f' and 'n' are the internal force and moment, respectively, E is the modulus of elasticity, and I, J, and A are the inertias for the cross section. Note that only stresses, not buckling failure, are accounted for. This function is conservative in that the stresses arising from 'f' are added to the stresses arising from 'n', whereas in practice the peak combined stress may be lower.
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