Elastic Section Modulus of a Hollow Circle formula |
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| \( S \;=\; \dfrac{ \pi \cdot ( R^4 - r^4 ) }{ 4\cdot R }\) | ||
| Symbol | English | Metric |
| \( S \) = elastic section modulus | \(in^3\) | \(mm^3\) |
| \( r \) = inside radius | \( in \) | \( mm \) |
| \( R \) = outside radius | \( in \) | \( mm \) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | \(3.141 592 653 ...\) |
