Which material measurement is used in calculating K for bend allowance in a 90 degree bend?

In the calculation of K for bend allowance during a 90-degree bend, both the thickness of the material and the radius of the bend play crucial roles. The thickness of the material (T) is significant because it influences how the material will deform when bent; thicker materials generally require more bending allowance than thinner ones.

The radius (R) is equally important as it determines the curvature of the bend. A larger radius typically results in a gentler bend, while a smaller radius can lead to tighter bends, impacting the amount of material stretch and thus affecting the bend allowance.

The bend allowance is essential for ensuring that the final length of the material after bending is accurate, avoiding complications such as overstretching or not providing enough length for the material to meet at the desired joint or position. Therefore, both thickness and radius must be considered together to accurately calculate K for bend allowance in a 90-degree bend. This comprehensive consideration ensures that the engineering and fabrication processes meet the design requirements properly.