【摘要】 分析了前人提出的应变梯度硬化模型,并在此基础上修正了该模型。通过对微拉深成形凸缘区域的分析,推导了在微拉深进行的初始阶段,考虑应变梯度硬化效应时周向应力产生的弯矩,并通过解析的方法,得到了考虑应变梯度效应时,板厚对弯矩变化的影响曲线。分析了微拉深进行过程中应变梯度效应的影响程度。这为评价应变梯度硬化效应对微拉深过程中凸缘抗起皱能力的影响提供了参考。更多还原

【Abstract】 In this paper,the strain gradient hardening model proposed by other scholars has been analyzed and modified firstly.After that,we have analyzed the flange’s stress of micro deep drawing,and deduced the moment with strain gradient effect on the onset of the flange wrinkling.Finally I have found out the change of strain gradient effect in the micro deep drawing.It provides the reference of estimating the anti-wrinkling ability of flange on process design of microforming with strain gradient effect.更多还原