Define unfolding parameters in the unfold_corner_ratios.inp file
The unfolding parameters define the location of the neutral axis when a profile is unfolded. The neutral axis is a line that runs along the length of a profile where stress and strain are equal to zero. Tekla Structures uses these parameters to create NC files and to show unfolded profiles in single-part drawings.
The settings in the unfold_corner_ratios.inp file have no effect in the following cases:
-
If the advanced option XS_USE_OLD_POLYBEAM_LENGTH_CALCULATION is set to TRUE.
-
If the advanced option XS_CALCULATE_POLYBEAM_LENGTH_ALONG_REFERENCE_LINE is set to TRUE. This only applies to polybeams with straight sections.
Unfolding parameter properties
This example shows unfolding parameters in the unfold_corner_ratios.inp file and the descriptions of the parameters.
1 HE300A S235JR 0 180 2 0 1000
.7
Property |
In the example |
Description |
---|---|---|
Type |
|
|
Profile |
|
You can also use wildcards with profile, for example, |
Material |
|
You can also use wildcards with material, for example, |
Rotation / thickness min |
|
For polybeams: the minimum angle when the profile is rotated around its longitudinal axis For plates: the minimum thickness of plate |
Rotation / thickness max |
|
For polybeams: the maximum angle when the profile is rotated around its longitudinal axis For plates: the maximum thickness of plate |
Flag |
|
This property defines what kind of parts are affected by the next two properties.
|
Angle / radius min |
|
For sharp folds: the minimum angle For curved bends: the minimum radius |
Angle / radius max |
|
For sharp folds: the maximum angle For curved bends: the maximum radius Maximum radius is measured to the plane defined by the ratio, so it is not dependent on how the part is created (where the reference axis is located). |
Ratio |
|
Defines how much the profile stretches or shrinks when unfolded. Ratio = (1 - the relative location of the neutral axis). If only the inner surface of the profile shrinks, the ratio is 1. If only the outer surface of the profile stretches, the ratio is 0. By default, the ratio is 0.5 for length calculation and 0.0 for bending radius calculation. Tekla Structures applies the unfolding ratio if the profile properties are within the range indicated by the minimum and maximum values. |