基于应变演化的集中性失稳确定方法

doi:10.3901/JME.2023.22.234

机械工程学报 ›› 2023, Vol. 59 ›› Issue (22): 234-244.doi: 10.3901/JME.2023.22.234

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基于应变演化的集中性失稳确定方法

崔学习, 万敏, 吴向东, 关铂镔, 周兵营

北京航空航天大学机械工程及自动化学院北京 100191

收稿日期:2022-10-28 修回日期:2023-03-02 出版日期:2023-11-20 发布日期:2024-02-19
通讯作者: 吴向东(通信作者)，男，1970年出生，博士，副教授，博士研究生导师。主要研究方向为塑性成形理论、工艺与先进装备技术。E-mail：wuxiangdongbuaa@163.com
作者简介:崔学习，男，1989年出生，博士研究生。主要研究方向为塑性成形理论、损伤及断裂。E-mail：xuexicui@buaa.edu.cn
基金资助:
国家自然科学基金资助项目(51875027)。

Method for Determining Localized Instability Based on Strain Evolution

CUI Xuexi, WAN Min, WU Xiangdong, GUAN Bobin, ZHOU Bingying

School of Mechanical Engineering and Automation, Beihang University, Beijing 100191

Received:2022-10-28 Revised:2023-03-02 Online:2023-11-20 Published:2024-02-19

摘要/Abstract

摘要： 在拉应力状态下，随着变形程度的增加，板料的塑性流动从稳定状态向亚稳定状态转变，最终以不稳定状态流动直到破裂。塑性失稳的发生通过约束材料流动状态进而限制了材料的成形极限。虽然经典的塑性失稳理论可以描述材料的失稳行为，但这些失稳理论是建立在准确获取材料的基本性能参数(如n、r)的基础上，而有些材料的基本性能参数并非恒定常数，其变化与应变的历程有关，这给理论计算失稳应变带来一定的困难。因此通过经典的塑性理论与数字图像相关法(Digital image correlation，DIC)技术相结合，研究缩颈区域的不同应变分量的演化历程，建立基于应变演化的集中性失稳判据。最后，以先进高强双相钢(DP780，DP980和DP1180钢板)为研究对象验证所建立的集中性失稳判据的有效性，并提出基于时间和空间统一性的集中性失稳点的确定方法。

Abstract: In the state of tensile stress, as the deformation increases, the plastic flow of the sheet metal changes from a stable state to a meta-stable state, and finally flows in an unstable state until it ruptures. Although the classic plastic instability theories can describe the instability behavior of materials, these instability theories are based on accurately obtaining the basic performance parameters of materials (such as n, r). However, the basic performance parameters of some materials are not constant and their changes are related to the course of strain, which brings certain difficulties to theoretical calculation of instability strain. Therefore, the classical plastic theory is combined with digital image correlation(DIC) technology to study the evolution law of different strain components in the neck shrinkage region, and the local instability criterion based on strain evolution is established. Finally, advanced high-strength dual-phase steels (DP780, DP980 and DP1180) are used as the research object to verify the validity of the localized instability criterion established. Subsequently, a method for determining the damage instability point based on the unity of time and space is proposed.

Key words: plastic deformation, digital image correlation, localized instability, dual-phase sheet metal, instability criterion

中图分类号:

TG115

崔学习, 万敏, 吴向东, 关铂镔, 周兵营. 基于应变演化的集中性失稳确定方法[J]. 机械工程学报, 2023, 59(22): 234-244.

CUI Xuexi, WAN Min, WU Xiangdong, GUAN Bobin, ZHOU Bingying. Method for Determining Localized Instability Based on Strain Evolution[J]. Journal of Mechanical Engineering, 2023, 59(22): 234-244.

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基于应变演化的集中性失稳确定方法

Method for Determining Localized Instability Based on Strain Evolution

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