Statics › Section J · Moments of inertia › Topic J.5
Polar moment of inertia
Bending depends on how area is spread about an axis in the plane; twisting depends on how it is spread about a point. The polar moment of inertia measures that, and it is the number that sizes every drive shaft.
In this topic
- Spread about a point
- The link to Ix and Iy
- Circles and tubes
- Rectangles and moving the point
- Worked example: a rectangle about two points
- Shafts in torsion
- Worked example: solid or hollow shaft
- A caution about other shapes
- Common mistakes to avoid
- Key takeaways
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