[Case study] Precise springback prediction of hightensile materials by using the Y-U model
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- Realistic reproduction of forming process and evaluation
The simulation considers the Bauschinger effect and plastic strain dependency of unloading Young's modulus.
Parts with hightensile steels have a measurable problem of inaccurate dimensions due to springback.
JSTAMP has a precise springback prediction module based on the "Yoshida-Uemori material model" (Y-U model) as a standard feature. The module can perform a simulation that considers the Bauschinger effect and the plastic strain dependency of unloading Young's modulus. The simulation is applicable to high-tensile materials and aluminum materials.
[Case study] Forming a B-pillar made of hightensile 980 material
Given below is a comparison between a JSTAMP simulation and a trial of the springback behavior of a B-pillar made of hightensile material during draw-forming. Over 90% of the area of the sheet panel, the gap between the simulation result and the trial sheet panel was within 1.0 mm.
| Gap area | Percentage |
|---|---|
| within 0.25mm | 32% |
| within 0.50mm | 59% |
| within 0.75mm | 80% |
| within 1.00mm | 91% |
Accurate representation of the Bauschinger effect by using the Y-U model
Stress-strain behavior of the Y-U model
In the springback prediction of super-high-tensile materials, where the Bauschinger effect (reduction of the deformation resistance during reversal stress) is presented strongly, it is important to predict the material behavior accurately. The Y-U model has gained broad acceptance owing to its strong ability to evaluate springback behaviors accurately in the bending formation of hightensile materials.
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- Improve QCD (Quality, Cost, and Delivery) in the early phase
- Realistic reproduction of forming process and evaluation
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