箱形孔轧制弹塑性与刚塑性有限元模拟的比较.pdfVIP

箱形孔轧制弹塑性与刚塑性有限元模拟的比较 洪慧平 程政 康永林 ( 北京科技大学材料科学与工程学院，北京100083 ) 摘要: 应用MSC.Marc 有限元模拟软件，在相同的轧制初始条件下，针对热作模具钢H11 钢坯在箱形孔型中的轧制变形过程分别进行三维热 力耦合弹塑性有限元模拟和刚塑性有限元模拟。根据建立的弹塑性有限元和刚塑性有限元模型，重点模拟和分析轧制过程的等效von Mises 应力、总等效塑性应变、等效塑性应变速率、温度变化、轧制力、轧制力矩以及轧件体积的变化情况。根据模拟分析和比较，得出热轧过 程弹塑性和刚塑性有限元模拟的异同，为有效模拟轧制过程提供理论依据。 关键词: 轧制, 孔型，弹塑性有限元，刚塑性有限元，有限元模拟 Comparison between Elastoplastic and Rigid-plastic Finite Element Simulations of Hot Rolling in Box Pass Huiping Hong Zheng Cheng Yonglin Kang School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 Abstract ：Three dimensional thermal mechanically coupled elastoplastic finite element simulation and rigid -plastic finite element simulation are used to simulate the hot rolling process of H11hot work die steel in box pass by means of MSC. Marc. The characteristics of elastoplastic and rigid-plastic finite element models are presented. The simulated results of elastoplastic and rigid-plastic analyses have been compared, which include equivalent von Mises stress, total equivalent plastic strain, equivalent plastic strain rate, temperature change, rolling force, rolling moment and volume change of the workpiece during the hot rolling process. From the simulation results, the difference of application of elastoplastic and rigid-plastic finite element simulations is obtained for effectively simulating hot steel rolling process. Keywords: rolling, roll pass, elastoplastic finite element simulation, rigid-plastic finite element simulation ，finite element simulation 1 前言 多年来弹塑性有限元法和刚塑性有限元法被广泛地应用于金属轧制成形过程的数值模拟研究 [1～3] 。但是针对 同一钢种在相同轧制条件下分别进行弹塑性有限元模拟和刚塑性有限元模拟并对两种模拟方法及结果进行比较， 文献报道不多。尽管在轧制过程（特别是热轧过程）通常弹性变形不大 （与塑性变形相比而言），但由于所用有 限元列式的不同，很显然弹塑性与刚塑性有限元模拟结果不可能相同。为了更加有效地模拟