强度系数越大，回弹角越大。
The larger strength coefficient is, the larger springback Angle is.
当一个物体反弹离开曲线时，撞击角等于回弹角。
When an object caroms off a curve, the Angle of impact is equal to the Angle of rebound.
厚板弯曲的回弹角明显小于薄板弯曲的回弹角，而板材的宽度对其回弹角则无明显影响。
And the springback Angle of thick sheet was obviously larger than that of thin sheet, on the other hand, it was not influenced clearly by the sheet width.
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