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By catia programmer

This section explains the calculations related to folding/unfolding operations.
When a bend is unfolded, the sheet metal deformation is represented by the
bend allowance V defined by the formula:
L = A + B + V

L is the total unfolded length
A and B the dimensioning lengths as defined on the figures below:


Bend-Allowance (2)

By catia programmer

Another way to compute the sheet metal deformation is the neutral fiber
definition (K Factor):
W = a * (R + k * T)
W is the flat bend width
R the inner bend radius
T the sheet metal thickness
a the inner bend angle in radians.
If b is the opening bend angle in degrees:
a = p * (180 - b) / 180
Physically, the neutral fiber represents the limit between the material
compressed area inside the bend and the extended area outside the bend.
Ideally, it is represented by an arc located inside the thickness and centered
on the bend axis. Therefore the K Factor always has a value between 0 and


Bend Allowance

By catia programmer

When you define the sheet metal parameters, a literal feature defines the
default K Factor, according to the DIN standard:
K = (0.65 + log(R / T) / 2) / 2
This formula can be deactivated or modified using Knowledge Advisor
When a bend is created, the bend K Factor and the bend allowance literals
are created.
Two cases may then occur:
If the Sheet Metal K Factor has an activated formula and uses the
default bend radius as input parameter, the same formula is activated
on the bend K Factor with the bend radius as input.
Else the bend K Factor is a formula equal to the Sheet Metal K Factor.
The bend allowance literal is equal to a formula representing the use of the
bend K Factor. This formula is fairly complex and it is strongly recommended
not to delete it.
V = a * (R + k * T) – 2 * (R + T) * tan ( min(p/2,a) / 2)
Though it is possible to deactivate the formula to enter a fixed value.
Finally, the bend flat width is computed from the bend allowance value.


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