CR340轧制差厚板纵梁成形性能研究  

Formability of CR340 Tailor Rolled Blank Longitudinal Beam

作　　者：汪志远 Habib Ullah Khan 王一霏 付秀娟[1] WANG Zhiyuan;Habib Ullah Khan;WANG Yifei;FU Xiujuan(Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学材料科学与工程学院,武汉430205

出　　处：《精密成形工程》2024年第10期182-189,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51575406);武汉工程大学研究生教育创新基金(CX2022246)。

摘　　要：目的研究复杂应力状态下轧制差厚板塑性变形行为和韧性损伤机理,获得轧制差厚板成形性能规律,促进轧制差厚板在汽车工业轻量化中的应用。方法应用细观损伤理论,采用有限元逆向法构建轧制差厚板GTN细观损伤模型,进一步结合有限元数值模拟技术研究轧制差厚板塑性变形行为和韧性损伤机理,对比分析差厚板与等厚板塑性变形特点,研究CR340轧制差厚板纵梁成形性能规律。结果将有限元逆向法和实验相结合,获得了损伤参数值,建立了描述轧制差厚板韧性损伤行为的GTN细观损伤模型,结合有限元分析可知,孔洞体积分数在过渡区变形最大的区域增加最为明显,孔洞最先在此处聚集发展;相比于等厚板,轧制差厚板成形纵梁时,在和厚区交界处的过渡区产生了显著的应力集中,引起过渡区应变急剧增大,使应力和应变整体分布的不均匀性增加。结论应用细观损伤理论和有限元数值模拟分析了轧制差厚板成形纵梁时韧性损伤最先产生的区域,结合应力和应变分布特点可知,与薄区相邻的过渡区在最大应变处最易出现成形缺陷。The work aims to study the plastic deformation behavior and toughness damage mechanism of the tailor rolled blank under complex stress conditions,and obtain the forming properties of the tailor rolled blank,so as to promote the applica-tion of the tailor rolled blank in the lightweight of the automobile industry.The microscopic damage theory was used,the GTN damage model of the tailor rolled blank was constructed by the finite element method,and the plastic deformation behavior and ductile damage mechanism of the tailor rolled blank were further studied by the finite element numerical simulation technology.The plastic deformation characteristics of tailor rolled blank and equal thick plate were compared and analyzed,and the form-ability of CR340 tailor rolled blank longitudinal beam was studied.The damage parameter values were obtained according to the inverse finite element method in combination with the experiment,and the GTN damage model was established to describe the toughness damage behavior of the tailor rolled blank.Combined with the finite element analysis,the pore volume fraction increased most obviously in the region with the largest deformation in the transition zone,where the holes first gathered and de-veloped.Compared with the equal thickness plate,the stress concentration in the transition zone at the junction with the thick zone was significant,which resulted in a sharp increase in the strain in the transition zone and an increase in the overall distribu-tion of stress and strain.In conclusion,the region where the ductile damage occurs first is analyzed according to the microscopic damage theory through finite element numerical simulation.According to the distribution characteristics of stress and strain,it is found that the transition region adjacent to the thin zone is the most prone to forming defects at the maximum strain.

关 键 词：轧制差厚板 成形性能 GTN模型 数值模拟 

分 类 号：TG386.3[金属学及工艺—金属压力加工]