Enter the length of the bend, the tensile strength, material thickness, and unsupported material length into the calculator to determine the bend force.
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Bend Force Formula
The following equation is used to calculate the Bend Force.
BF = (k*L*St*t^2) / d
- Where BF is the bend force (lbs)
- k is a constant based on the die shape (1.33 for V dies)
- L is the length of the bend (in)
- St is the tensile strength of the material (lb/in^2)
- d is the unsupported material (die opening) (in)
What is a Bend Force?
Definition:
A bending force is a total force required to bend a material with a particular die shape and opening.
How to Calculate Bend Force?
Example Problem:
The following example outlines the steps and information needed to calculate Bend Force.
First, determine the k constant. In this example, we are using a v die, so the constant is 1.33.
Next, determine the length of the bend. This bend is measured to be 3 inches.
Next, determine the tensile strength of the material. The tensile strength is calculated to be 50 lbs/in^2.
Next, determine the material thickness. In this case, the material thickness is 1.5 inches.
Next, determine the die opening size. For this problem, the unsupported material is 8 times the thickness = 12 inches.
Finally, calculate the bend force using the formula above:
BF = (k*L*St*t^2) / d
BF = (1.33*3*50*1.5^2) / 12
BF = 37.406 lbs
