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The section modulus W (mm3/m1) is the amount of resistance which a section will provide against a bending moment. In general, the following will apply to homogeneous sections:
σ max. = M / W
where: σ max. = the maximum bending stress [N/mm2], M = the bending moment [Nmm]. Please note that the section modulus only pertains to (the stress in) the most external fibres.
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