Plastic Section Modulus of a Thin Wall Rectangle formulas |
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\( Z_x \;=\; 2 \cdot [ \; b\cdot t \cdot \left( \dfrac{ a}{2} - \dfrac{ t}{2 } \right) + t \cdot \left( \dfrac{ a}{2} - t \right)^2 ] \) \( Z_y \;=\; 2\cdot t \cdot \left( \dfrac{ a}{2} - t \right) \cdot \left( \dfrac{ b}{2} - t \right) + 2\cdot b\cdot t \cdot \left( \dfrac{ b}{2} - \dfrac{ t}{2} \right) \) |
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| Symbol | English | Metric |
| \( Z \) = elastic section modulus | \(in^3 \) | \(mm^3 \) |
| \( a, b \) = edge | \(in \) | \(mm \) |
| \( t \) = thickness | \(in \) | \(mm \) |
