金属板料塑性应变比的影响因素分析
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摘要
进行了室温下的单向拉伸试验;采用数字图像相关测量方法 (DIC方法),测量了AA5754和Q235B的塑性应变比随着试样塑性变形的变化规律。分析了应变水平和材料厚度对两种材料塑性应变比、平均塑性应变比和凸耳参数的影响。结果表明两种金属板料的塑性应变比均不是恒定的,随着塑性变形量的变化而变化。在材料刚进入塑性变形状态时,塑性应变比急速上升至最大值,在随后阶段则呈现下降;对于不同厚度的试样,其塑性应变比随应变水平的变化趋势基本一致;材料的凸耳参数受应变水平的影响比较小。
Uniaxial tensile test was carried out at room temperature. For the two materials,AA5754 and Q235 B,digital image correlation method( DIC method) was used to measure the change regulation of plastic strain ratio with the plastic deformation of the specimen. The effects of strain level and material thickness on plastic strain ratio,average plastic strain ratio and lug parameter of two kinds of materials were analyzed respectively. The results show that the plastic strain ratios of two metal sheets are not constant,and vary with the plastic deformation. When the material just in the plastic deformation state,the plastic strain ratio rises rapidly to the maximum value,and decreases in the subsequent stage. For the samples with different thicknesses,the change trends of plastic strain ratio with the strain level are basically the same; the lug parameters of the two kinds of materials are less affected by the strain level.
Uniaxial tensile test was carried out at room temperature. For the two materials,AA5754 and Q235 B,digital image correlation method( DIC method) was used to measure the change regulation of plastic strain ratio with the plastic deformation of the specimen. The effects of strain level and material thickness on plastic strain ratio,average plastic strain ratio and lug parameter of two kinds of materials were analyzed respectively. The results show that the plastic strain ratios of two metal sheets are not constant,and vary with the plastic deformation. When the material just in the plastic deformation state,the plastic strain ratio rises rapidly to the maximum value,and decreases in the subsequent stage. For the samples with different thicknesses,the change trends of plastic strain ratio with the strain level are basically the same; the lug parameters of the two kinds of materials are less affected by the strain level.
引文
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[7]ISO 10113:2006,Metallic materials—Sheet and strip—Determination of plastic strain ratio[S].
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[10]GB/T 228.1—2010,金属材料拉伸试验第1部分室温拉伸试验[S].GB/T 228.1—2010,Metallic materials—Tensile testing—Part1:Method of test at room temperature[S].
[2]李泷杲.金属板料成形有限元模拟基础[M].北京:北京航空航天大学出版社,2008.LI Shuanggao.Fundamentals of finite element simulation of sheet metal forming[M].Beijing:Beihang University Press,2008.
[3]毛卫民,马全仓,冯惠平,等.冲压铝板塑性应变比的在线检测技术[J].中国有色金属学报,2006,16(7):1149-1154.MAO Weimin,MA Quancang,FENG Huiping,et al.On-line determination technology on Lankford parameter of deep drawing aluminum sheets[J].The Chinese Journal of Nonferrous Metals,2006,16(7):1149-1154.
[4]毛卫民.冲压钢板塑性应变比r值的在线检测技术[J].钢铁,2006,41(11):37-41.MAO Weimin.On-line r value determination of deep drawing steel sheet[J].Iron and Steel,2006,41(11):37-41.
[5]吕庆功,陈光南,周家琮,等.深冲钢板的主要织构对塑性应变比的影响[J].钢铁研究,2000,(5):40-43.LQinggong,CHEN Guangnan,ZHOU Jiacong,et al.Influence of main texture components on plastic strain ratio of deep drawing steel sheet[J].Research on Iron and Steel,2000,(5):40-43.
[6]叶南,张丽艳.基于立体视觉的板料塑性应变比测量[J].光学学报,2010,30(12):3515-3522.YE Nan,ZHANG Liyan.Determining plastic strain ratio of sheet metal based on stereo vision[J].Acta Optica Sinica,2010,30(12):3515-3522.
[7]ISO 10113:2006,Metallic materials—Sheet and strip—Determination of plastic strain ratio[S].
[8]严勇,吴超,胡志力,等.汽车铝合金覆盖件成形数值模拟的各向异性屈服准则研究[J]塑性工程学报,2016,23(2):92-97.YAN Yong,WU Chao,HU Zhili,et al.Anisotropic yield criterion for automotive aluminum panels forming numerical simulation[J].Journal of Plasticity Engineering,2016,23(2):92-97.
[9]牛超,臧顺来.数字图像相关法在薄板成形极限测定中的应用[J]塑性工程学报,2014,21(6):75-80.NIU Chao,ZANG Shunlai.Digital image correlation in determination of forming limit diagrams for sheet metal[J].Journal of Plasticity Engineering,2014,21(6):75-80.
[10]GB/T 228.1—2010,金属材料拉伸试验第1部分室温拉伸试验[S].GB/T 228.1—2010,Metallic materials—Tensile testing—Part1:Method of test at room temperature[S].