基于Lemaitre模型的辊式冲裁工艺断面质量分析

发布时间：2018-06-28 05:24

本文选题：冲裁工艺 + 断面质量　；参考：《工程科学学报》2017年08期

【摘要】：为了准确表征材料变形中逐渐劣化的过程,引入考虑损伤与裂纹萌发的弹塑性本构模型.基于Abaqus/Explicit的二次开发接口,编写耦合Lemaitre损伤模型的用户子程序,根据算例验证其可靠性.通过反复加载-卸载拉伸试验并利用弹性模量变化法来获得损伤参数值.建立辊式冲裁工艺有限元模型,应用Lemaitre损伤模型来预测断面质量,并进行试验验证.分析冲裁间隙、模具磨损与板厚等工艺参数对断面质量、冲裁力及扭矩的影响.结果表明:前刃口断面质量总体上要好于后刃口,但光亮带具有一定的倾角;塌角区会随冲裁间隙增加而增大;模具磨损程度增加会导致毛刺急剧增大;最大冲裁力与扭矩会随着板厚的增大而增大.
[Abstract]:An elastoplastic constitutive model considering damage and crack germination was introduced in order to accurately characterize the process of progressive deterioration in material deformation. Based on the secondary development interface of Abaqus / explicit, the user subprogram of coupled Lemaitre damage model is written, and its reliability is verified by an example. The damage parameters were obtained by repeated loading-unloading tensile test and elastic modulus variation method. The finite element model of roll blanking process was established, and the Lemaitre damage model was used to predict the cross section quality. The effects of blanking clearance, die wear and plate thickness on cross section quality, punching force and torque are analyzed. The results show that the cross section quality of the front edge is generally better than that of the back edge, but the bright zone has a certain dip angle, the collapse angle area increases with the increase of blanking clearance, and the burr increases sharply with the increase of die wear degree. The maximum blanking force and torque will increase with the increase of plate thickness.
【作者单位】：华北理工大学冶金与能源学院现代冶金技术教育部重点实验室;北京科技大学材料科学与工程学院;
【分类号】：TG386.2

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