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What are Radial Stresses and Curvature Factor?

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For a constant cross sectional the radial stress induced by a bending moment in a member is calculated by using this formula

fr=3M/2Rbd

where
M=bending moment, in lb (N m)
R = radius of curvature at centerline of member, in (mm)
b =width of cross section, in (mm)
d =depth of cross section, in (mm)

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When we have a curved portion, curvature factor is introduced and is calculated as

Cc=1-2000(t/R)2
where
t is the thickness of lamination in (mm)
R is the radius of curvature of lamination in (mm).

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