1. What is Square Tube Strength?

Square tube strength is calculated by multiplying the material's yield strength by its section modulus. This gives the maximum bending moment the tube can withstand before yielding.

2. How Does the Calculator Work?

The calculator uses the strength formula:

Where:

• \( Yield\ Strength \) — Material's yield point (psi)
• \( Section\ Modulus \) — Geometric property of cross-section (in³)

Explanation: The equation calculates the bending capacity of a square tube based on its material properties and cross-sectional geometry.

3. Importance of Strength Calculation

Details: Calculating tube strength is essential for structural design, ensuring components can withstand expected loads without permanent deformation.

4. Using the Calculator

Tips: Enter yield strength in psi and section modulus in cubic inches. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is yield strength?
A: The stress at which a material begins to deform plastically (permanently). Common values: A36 steel = 36,000 psi, 6061-T6 aluminum = 35,000 psi.

Q2: How do I find section modulus?
A: For square tubes: \( S = \frac{b^4 - (b - 2t)^4}{6b} \) where b=outside width, t=wall thickness.

Q3: Does this account for safety factors?
A: No, this calculates theoretical strength. Always apply appropriate safety factors in design.

Q4: What about other failure modes?
A: This only addresses bending strength. Consider shear, torsion, and buckling separately.

Q5: Can this be used for rectangular tubes?
A: Only if using the correct section modulus for the rectangular shape.