In SI unit systems the unit of Section Modulus is m 3 and in the US unit system inches 3. Section modulus is denoted by “Z” and mathematically expressed as Z=I/y The section modulus of a section is defined as the ratio of the moment of inertia (I) to the distance (y) of extreme fiber from the neutral axis in that section. The larger the moment of inertia, the greater is the moment of resistance against bending. Bending stresses are inversely proportional to the Moment of Inertia.
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