基于DIC技术的不同汽车用板材成形性能评估
Formability Assessment of Different Materials for Automotive Sheets Based on DIC Technology
摘 要
利用万能材料试验机对多种汽车用板材,包括不同强度级别的先进高强钢、传统高强钢、铝合金板材进行室温拉伸试验,采用数字图像相关(DIC)技术获取材料在拉伸过程中的全场应变,对比了不同板材的成形性,讨论了材料成形性能的评估方法。结果表明:汽车用板材的断裂应变整体上远大于断裂总延伸率,相比于断裂总延伸率,断裂应变与强度更符合负相关的关系;最大力总延伸率反映材料的硬化与均化应变的能力,不是塑性的直接指标,断裂应变表征材料的真实塑性;成形性指数综合考虑了硬化能力与真实塑性,相比于单一的延伸率指标能更好地评价材料的成形性。
硬化能力
真实塑性
整体成形性
局部成形性
digital image correlation
hardening ability
true plasticity
global formability
local formability
Abstract
Room temperature tensile tests were conducted on a variety of materials for automotive sheets, including advanced high strength steel with different strength levels, traditional high strength steel and aluminum alloy sheet, by using a universal material testing machine. The full-field strain of the materials during tension was obtained by digital image correlation (DIC) technology. The formability of different sheets was compared, and the evaluation method of material formability was discussed. The results show that the fracture strains of the materials for automotive sheets were much larger than the percentage total extension at fracture in general. Compared with the percentage total extension at fracture, the fracture strain was more negatively correlated with the strength. The percentage total extension at maximum force reflected the ability of hardening and strain homogenization of materials, and was not the direct index of plasticity. The fracture strain represented the true plasticity of materials. The formability index took into account both the hardening ability and the true plasticity, and could evaluate the formability of the material better than the single elongation.
中图分类号 TG115 DOI 10.11973/jxgccl202306014
所属栏目 材料性能及应用
基金项目
收稿日期 2022/2/14
修改稿日期 2023/2/1
网络出版日期
作者单位点击查看
备注纪登鹏(1992-),男,江苏淮安人,工程师,硕士
引用该论文: JI Dengpeng,LIAN Changwei,LIU Bing. Formability Assessment of Different Materials for Automotive Sheets Based on DIC Technology[J]. Materials for mechancial engineering, 2023, 47(6): 78～85
纪登鹏,连昌伟,刘兵. 基于DIC技术的不同汽车用板材成形性能评估[J]. 机械工程材料, 2023, 47(6): 78～85
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【7】HILL R.On discontinuous plastic states,with special reference to localized necking in thin sheets[J].Journal of the Mechanics and Physics of Solids,1952,1(1):19-30.
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