Calculate bend allowance on 38 matweial1/24/2024 ![]() Based on the same K factor as the large-radius condition, the flat pattern here produces a part that is too long. It’s thinned at the flat bottom to 0.063 to 0.078 in. We also do sharp bending from sheet stock that is thinned in the bent areas, but V-cut with a small flat bottom. The inside radius for these bends is 0.75 in., and all along the radius the material thins to 0.078 in. I have an accurate K factor for this bend condition. thick, thinned in the bent areas along the circumference and wrapped into a rectangle with radiused corners. Our tanks are formed from sheet stock typically 0.25 in. After a few years of iteration, we have developed an accurate flat-pattern method for our tank bending operations. Question: I am forming plastic, not metal, but I am applying metal bending principles to my application. Instead, without going through any physical change, it simply moves toward the inside surface of the material, causing elongation in the bend. The neutral axis does not remain at 50 percent of the material thickness during bending. Material on the inside of the bend has reached its plastic state while the outside of the bend has not this elastic state on the inside of the bend forces the bend to spring open. Every bend has tensile stresses on the outside surface and compressive stresses on the inside surface. ![]()
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