To analyse stretch bending of narrow strip by numerical calculation, taking the loading history into account, the deformed zone was divided into many elements to determine their strain by the condition that constant volume remains in deformation.

• 摘要在考虑加载历史的情况下，为采用数值方法研究窄板拉弯成形，将变形区划分成若干个单元，按塑性变形体积不变条件，确定单元应变。