![]() ![]() ![]() Where the planar second moment of area describes an object's resistance to deflection ( bending) when subjected to a force applied to a plane parallel to the central axis, the polar second moment of area describes an object's resistance to deflection when subjected to a moment applied in a plane perpendicular to the object's central axis (i.e. It is a constituent of the second moment of area, linked through the perpendicular axis theorem. The second polar moment of area, also known (incorrectly, colloquially) as "polar moment of inertia" or even "moment of inertia", is a quantity used to describe resistance to torsional deformation ( deflection), in objects (or segments of an object) with an invariant cross-section and no significant warping or out-of-plane deformation. JSTOR ( August 2019) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Second polar moment of area" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. I p the polar moment of inertia of the bolt group I x + I y You will note that the equations listed above are slightly different than found on SCM page 7-9. ![]()
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