Meanwhile, the process of stress turn over of wide sheet bending forming is described by introducing a thought of dividing the sheet into three layers, so it is more accurate and popular.

• 同时,借鉴分三层思想,较好地考虑了宽板在弯曲成形过程中部分纤维层应力反号过程,因此具有较好的精确性和较强的普适性。