So in this case, the minimum inside bend radius is 2 times the material thickness.” If I am looking at properties for A36 steel, I see elongation properties between 18 and 21 percent. If the material is 0.5 inch thick: 4 × 0.5 = 2. Now, multiply that answer by the plate thickness. Next, subtract 1 from that answer: 5 – 1 = 4. To state your example, “If the steel has a tensile reduction value of 10 percent, divide 50 by that value: 50/10 = 5. You described a rough rule to find a steel’s minimum bend radius: Divide 50 by the material’s reduction percentage, as specified by the material supplier, subtract by 1, and then multiply by the plate thickness.
Q: In a previous Bending Basics article, you mention a “material’s tensile reduction percentage” used for calculating the minimum inside bend radius of various metals. Grain, increases the required minimum inside radius of Longitudinal bending, or bending with the material
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