基于霍普金森拉杆试验的焊点焊核区动态本构关系确立
PDF下载 (384)吴 鑫 1,钟 原 2*,宋 力 1.基于霍普金森拉杆试验的焊点焊核区动态本构关系确立[J].宁波大学学报(理工版),2015,28(04):129-132.DOI:
WU Xin 1,ZHONG Yuan 2*,SONG Li 1.Dynamic Constitutive Relationship in Spot Welding Area Based on Hopkinson Bar Test[J].Journal of Ningbo University(Natural Science & Engineering Edition),2015,28(04):129-132.DOI:
| Title: | Dynamic Constitutive Relationship in Spot Welding Area Based on Hopkinson Bar Test |
| 作者: | 吴 鑫 1, 钟 原 2*, 宋 力 1 |
| Author(s): | WU Xin 1, ZHONG Yuan 2*, SONG Li 1 |
| 关键词: | 霍普金森拉杆; 车身焊点; 焊核; Cowper-Symonds本构方程 |
| Keywords: | Hopkinson bar; vehicle spot welding; welding; Cowper-Symonds; constitutive equation |
| 分类号: | O341 |
| 文献标识码: | A |
| 摘要: | 以DC53DZ为基板, 进行焊点结构的焊核区力学特性研究. 通过设计试验试件并利用MTS静态拉伸机及霍普金森拉杆(Split Hopkinson Tension Bar, SHTB)对其进行准静态拉伸及应变率600~1600S-1之间的动态拉伸试验, 得到焊核区的力学特性, 并确立了其基于Cowper- Symonds本构方程参数. 利用数值仿真对焊核动态拉伸试验进行模拟, 验证了设计试件的长宽比能使试件满足试验要求的轴向应力应变均匀状态. 最后由模型中得到的焊核区应力－应变曲线与试验数据拟合, 再现了焊核区材料特性试验曲线. 验证了DC53DZ钢板的焊点焊核的本构方程参数的合理性. |
| Abstract: | The mechanical characteristics of nugget zone of spot welding based on steel DC53DZ is investigated. The test using MTS quasi static tensile test is conducted. Dynamic tensile test with the strain rate between 600-1600 S-1 is carried out by applying Split Hopkinson Tension Bar (SHTP) to obtain the constitutive parameters of Cowper-Symonds model. Numerical simulation is carried out using LS-DYNA, and the result shows that both the stress and strain are uniformed within the specimen under the designed ratio of length-to-width. With the constitutive parameters obtained from the experiment, the simulated dynamic tensile test is in good agreement with the real-world test, indicating the validity of the dynamic tensile test in this paper. |
| 参考文献 /References: | [1] 吕毅宁, 吕振华. 焊点连接模型对结构刚度的有限元模拟精度的影响分析[J]. 工程力学, 2009, 26(10):171- 176. [2] Dancette S, Fabregue D. Experimental and modeling investigation of the failure resistance of advanced high strength steels spot welds[J]. Engineering Fracture Mechanics, 2011, 78:2259-2272. [3] Dancette S, Fabregue D. A finite element model for the prediction of advanced high strength steel spot welds fracture[J]. Engineering Fracture Mechanics, 2012, 87: 48-61. [4] 蒋小晴, 杨济匡. 前纵梁碰撞模拟中的含碘建模方法比较[J]. 汽车安全与节能学报, 2010, 1(4):327-331. [5] Nielsen K. 3D modeling of plug failure in resistance spot welded shear-lab specimens (DP600-steel)[M]. New York: Springer Science+Business Media, 2008:125-139. [6] 白晓红, 吴迪. 数字图像相关(DIC)测量方法在材料变形研究中的应用[D]. 沈阳: 东北大学, 2011. [7] 宋力, 胡时胜. SHPB数据处理中的二波法与三波法[J]. 爆炸与冲击, 2005, 25(4):368-373. |
| 备注/Memo: | 收稿日期: 2014-09-29. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（60874083）. 第一作者: 吴鑫（1990－）, 男, 浙江衢州人, 在读硕士研究生, 主要研究方向: 冲击动力学. E-mail: wu1heart1@163.com *通信作者: 钟原（1961－）, 男, 江西南昌人, 博士, 主要研究方向: 汽车安全结构等. E-mail: zhongyuan@catarc.ac.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
