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FAQ 003216 | How does the flattening process consider the compensation in the determination of cu...
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First Steps with RFEM
Question
How does the flattening process consider the compensation in the determination of cutting patterns?
Answer
The flattening process in the RF‑CUTTING‑PATTERN add-on module is an iterative process that flattens the respective areas of a cutting pattern by minimizing the distortion energy assuming the assigned material behavior.
In simplified terms, the method compresses the initial geometry in a press assuming a frictionless contact until the stresses due to flattening are in equilibrium with each other.
→ See the video
Since this process covers the complete mechanics of the curved structural component, you it is possible to additionally consider the compensation directly as an applied strain load.
Figure 01 - Compensation
Since the strains from the compensation specification interact with the strains from the flattening in the algorithm of RF‑CUTTING‑PATTERN, this kind of compensation consideration cannot be compared with the usual, flat scaling of the non-compensated cutting patterns. The consideration of the complete "cutting pattern mechanics" with all strain terms provides very high-quality geometry of the cutting pattern.
Before the flattening itself, the integral flattening process determines a coordinate system (warp and weft direction) from the mean orientation of FE elements, and uses the initially defined coordinate system with no regard to the respective position of the FE elements in the coordinate system orientation in order to describe the compensation strain and stiffness. Thus, the comparison shown in the video is only valid for an isotropic linear elastic membrane model.
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