| 摘要: |
| 以单层晶极薄带轧制为研究对象,采用多尺度晶体塑性有限元方法模拟其在拉-压-剪复合应力状态下的宏观剪切带和微观滑移带演化,优化极薄带材轧制工艺。在微观层次上,每个晶粒被离散成若干个有限元单元,且每个积分点采用单晶体本构模型。宏-微观层次模拟的共同特征是滑移带演化高度的各向异性和局部化,微观层次的模拟更加明显。结果表明:新剪切带随轧制区施加额外剪切变形而形成,在拉-压-剪复合应力下,强剪切造成已缩窄的主次剪切带随轧制压下的增大而又扩展。单系滑移带在各变形晶粒内的演化差异很大,存在主次滑移,随压-剪复合应力状态的增强而形成亚滑移带。在拉-压-剪复合应力下,单滑移扩展和叠加形成贯穿晶界的累积滑移带,晶界起到很好的滑移承载和传递作用。 |
| 关键词: 极薄带异步轧制 单层晶铜箔 滑移带 晶体塑性 有限元 |
| DOI：10.11951/j.issn.1005-0299.20230050 |
| 分类号:TG335.5 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51804219, 52005432)；安徽省自然科学基金资助项目(1808085QE161)；安徽省重点研究与开发计划项目(202004a05020011)；安徽省高校优秀青年人才支持计划项目(gxyq2022093)；安徽省高校优秀青年科研项目(2022AH030153)；铜陵学院重点培育项目(2020tlxyxs33). |
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| Crystal plasticity finite element method (CPFEM) analysis for slip band development in foil asymmetrical rolling |
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CHEN Shoudong1,2,3, LU Rihuan4
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(1.School of Mechanical Engineering, Tongling University, Tongling 244061, China;2.State Key Lab of Rolling and Automation (Northeastern University), Shenyang 110819, China; 3.Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes,Tongling University, Tongling 244061, China;4.National Engineering Research Center for Equipment and Technology of Cold Rolled Strip,Yanshan University, Qinhuangdao 066004, China)
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| Abstract: |
| A multi-scale crystal plastic finite element method is used to simulate the evolution of macroscopic shear band and microscopic slip band under tension-compression-shear combined stress optimizing the rolling process of single crystal foil rolling. At the microscopic level, each grain is separated into several finite element elements, and a single crystal constitutive model is used for each integral point. The common feature predicted by simulations at the macro-micro level is the anisotropy and localization of slip zone evolution height, more clearly revealed by simulations at the microscale. The results show that a new shear band is formed with additional shear deformation applied to the rolling zone. The narrowed primary and secondary shear bands to re-expand with the increase of rolling reduction under the combined stress state of tension-compression-shear. There are primary and secondary slips in which evolution of single-system slip bands varies greatly among the deformed grains, with sub-slip bands formed with the increase of compression-shear stress states. The single slip expands and superposes to form a cumulative slip band across the grain boundary, and the grain boundary plays an important role in carrying and transferring the slip under the combined stress state of tension-compression-shear. |
| Key words: foil asymmetrical rolling single-layer crystal copper foil slip band crystal plasticity finite element |
