Torsion Constant for Ellipse Cross-section Formula |
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| \( J \;=\; \dfrac{ \pi \cdot a^3 \cdot b^3 }{ a^2+b^2 }\) | ||
| Symbol | English | Metric |
| \( J \) (Greek symbol alpha) = torsion constant | \(in^4\) | \(mm^4\) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | \(3.141 592 653 ...\) |
| \( a \) = semi-major axis of an ellipse | \(in\) | \(mm\) |
| \( b \) = semi-minor axis of an ellipse | \(in\) | \(mm\) |
