Ultimate tensile strength psi.
Calculating developed length for sheet metal bends.
Sheet metal flat length can be calculated in the following three simple steps.
By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows.
The formula for calculating sheet metal bending allowance is please refer to the above picture.
Cells on the right will output the desired values.
R is inner bend radius.
Ba bend angle π 180 r k factor t eqn 1.
Calculate the value bend allowance for required sheet metal bend by using below formula.
Where ba is bend allowance.
We know that ba is the length of the arc on the neutral axis.
Punch edge radius in.
You only have to insert interior angle flange lengths k factor inside radius and material thickness.
Bend angle represents the angle to which sheet metal has bend here it is 90 degree.
We can calculate the leg length 1 and 2 as follows.
The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.
If the value of sheet metal k factor and bending flange length is known.
Die edge radius in.
Therefore the bend allowance added to the flange lengths is equal to the total flat length.
With this free online tool we quickly get the sheet metal bend deduction and therefore the sheet metal blank initial flat length from the finished part measurements.
At the neutral axis we have.