High Quality Content by WIKIPEDIA articles! In structural engineering, the section modulus of a beam is the ratio of a cross section's second moment of area to the distance of the extreme compressive fibre from the neutral axis. For symmetrical sections this will mean the Zx max and Zx min are equal. For unsymmetrical sections (T-beam for example) the section modulus used will differ depending on whether the compression occurs in the web or flange of the section.The section modulus is directly related to the strength of a corresponding beam. It is expressed in units of volume, e.g., mm3.

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