Beam Bending

W = Force (N) 

L = Length (mm)

M = Bending Moment (Nmm)

y = Distance from Neutral axis to fiber - usually extremity (mm)

E = Young's Modulus or Mod of Elasticity (convert to MPa)

I = 2nd Moment of Area or Area Moment (mm4)

Z = Section Modulus (mm3) = I / y

Bending Stress = M*y / I = M / Z (MPa) which is maximum tension (or compression) at bottom (or top) of beam.

Bending Moment and Deflection Tables




If column is "slender" it is likely to buckle when in compression.

Standard Section Data