Square Tube Deflection Formula
Square tube deflection uses ordinary beam formulas. The tube matters through moment of inertia I; the load case controls the constant in the equation.
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Simply supported center load
delta = P * L^3 / (48 * E * I)
Simply supported uniform load
delta = 5 * w * L^4 / (384 * E * I)
Tube inertia
For a square tube, I is the outside square inertia minus the inside hollow square inertia.
Related pages
- Square tube deflection calculator - handles common load cases and stress.
- Section modulus calculator - calculate I and section modulus.
- Beam deflection calculator - general beam deflection formulas.
- Square tube weight calculator - estimate member weight.