Bend allowance is the length of the neutral axis of a bent part
and is calculated as BA = angle × (radius + K-factor × thickness).
The K-factor or stretch factor of the material
and the angle
can be in radians or degrees, depending on the formula. The bend allowance is the amount of metal to be added to the total layout
and is equal to the difference between the unfolded length (L) and the sum of the flange lengths (L1 and L2).
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Summaries from the best pages on the web
The Bend Allowance is defined as the material you will add to the actual leg lengths of the part in order to develop a flat pattern. The leg lengths are the part of the flange which is outside of the bend radius. In our example below a part with flange lengths of 2” and 3” with an inside radius of .
Bend Allowance – SheetMetal.Me
The bend allowance describes the length of the neutral axis between the bend lines, or in other words, the arc length of the bend. Therefore, the bend allowance added to the flange lengths is equal to the total flat length.
Bend Allowance Calculator - CustomPart.Net
To calculate this bend allowance, following formula can be used: This formula takes into account the different geometries of the part you are forming and its properties. The most important…
What is bend allowance? - goodfabs
To calculate bend allowance: Obtain the properties of the bend (bend radius, angle, and method used). Obtain the characteristics of your material (thickness and K-factor for this specific bend). Input…
Bend Allowance Calculator