Figure 1 – Central Pillar: PAM-STAMP 2G results compared to physical testing

The Challenge

There is a strong pressure to reduce CO₂ emissions in vehicles, one way being to cut their weight.  At the same time, crash performance must not be sacrificed. The usage of thin ultra-high strength steel can solve both these problems. One of the complexities that arises when using ultra-high strength steel  is the high risk of springback during stamping.

Traditional simulation methods for mild steel show their limitations here, so the Yoshida-Uemori model has to be used to control the springback.

The Benefits

TOA Industries has found that by using PAM-STAMP 2G in combination with the Yoshida-Uemori model, the springback for thin ultra-high strength steel parts can be controlled within the normal time frame and at a low cost. They now mass-produce 980MPa-class ultra-high strength steel components used in current vehicles.

 “To develop Ultra-High Strength Steel automotive components in a short period of time, early assessment by digital simulation is essential and its accuracy is crucial. PAM-STAMP 2G, which is highly accurate in springback analysis, can be used to combine the Yoshida-Uemori material model with the Bauschinger effect in order to further improve springback prediction accuracy.”

 Mr. Masuyoshi Ueda

General Manager, 1st Product Engineering Department, TOA Industries Co., LTD.

“PAM-STAMP 2G, which provides high accuracy in springback analysis, has become an essential tool for us to achieve early delivery and low cost. To develop Ultra-High Strength Steel automotive parts into mass production in a short period of time, accurate early assessment is very important. By using the Yoshida-Uemori material model and taking into account the Bauschinger effect, we improved springback prediction accuracy on 980MPa level parts. As a result, we succeeded in reducing the amount of physical trial and error cycles.”

 Mr. Nobuyuki Seki

Subsection Manager, 1st Production Engineering Department, Stamping Engineering Section, TOA Industries Co., LTD.

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