吉林大学学报(工学版) ›› 2019, Vol. 49 ›› Issue (4): 1266-1271.doi: 10.13229/j.cnki.jdxbgxb20180291

• • 上一篇    

基于损伤修正M⁃K模型的高强度钢成形极限预测

刘文权1(),盈亮2,荣海2,胡平2()   

  1. 1. 大连理工大学 运载工程与力学学部，辽宁 大连 116024
    2. 大连理工大学 汽车工程学院，辽宁 大连 116024
  • 收稿日期:2018-04-01 出版日期:2019-07-01 发布日期:2019-07-16
  • 通讯作者: 胡平 E-mail:wqliu2012@mail.dlut.edu.cn;pinghu@dlut.edu.cn
  • 作者简介:刘文权（1989?），男，博士研究生. 研究方向：高强度钢成形性实验与仿真.E?mail:wqliu2012@mail.dlut.edu.cn
  • 基金资助:
    国家自然科学基金项目(51705065);中央高校基本科研业务费专项项目(DUT17JC38)

Forming limit prediction of high strength steel based on damage modified M⁃K model

Wen⁃quan LIU1(),Liang YING2,Hai RONG2,Ping HU2()   

  1. 1. Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, China
    2. School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2018-04-01 Online:2019-07-01 Published:2019-07-16
  • Contact: Ping HU E-mail:wqliu2012@mail.dlut.edu.cn;pinghu@dlut.edu.cn

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摘要：

为探究材料内部损伤演化对其成形特性的影响，在M?K凹槽失稳理论的基础之上，通过引入GTN损伤模型，建立了耦合损伤的高强度钢22MnB5成形极限预测方法，并确定了相关损伤参数。该方法以临界孔洞体积分数作为失稳判据，增强了预测方法的物理意义。通过理论计算分析了变形路径对板材失稳以及损伤演化的影响。同时，通过开展NAKAZIMA实验研究，获取了22MnB5的成形极限数据并对其变形特点进行了分析。通过与实验结果的对比，验证了本文预测方法的有效性。

关键词: 材料合成与加工工艺, 成形极限, M?K凹槽理论, GTN损伤模型, 损伤演化

Abstract:

In order to understand the effect of inner damage evolution on the formability of sheet metal, a prediction method of forming limit coupled with GTN damage model was developed based on the M-K groove instability theory. The damage-related parameters of high strength steel 22MnB5 were calibrated accordingly. The critical void volume fraction was chosen as the instability criterion, which improves the physical significance of the prediction method. And the effects of loading path on the instability of sheet and damage evolution were also studied based on the theoretical calculation results. Meanwhile, the NAKAZIMA test was conducted, and the forming limit data under different loading path was obtained. The deformation characteristics of 22MnB5 sheet were also analyzed. By comparing with the experimental results, the validity of the proposed method was verified.

Key words: materials synthesis and processing technology, forming limit, M?K groove theory, GTN damage model, damage evolution

中图分类号: 

  • TG386

图1

耦合损伤的M?K模型理论框图"

图2

孔洞损伤在不同变形模式下的演化规律"

图3

高强度钢成形极限测试设备"

图4

胀形断裂后样件"

图5

宽度80 mm样件不同变形阶段应变场"

图6

成形极限实验结果与理论预测结果对比"

图7

不同变形路径下失稳应变增量的比值"

图8

不同路径下A区孔洞体积分数演化曲线"

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