异步轧制板带应变场分析

Analysis of strain field of strip during asymmetrical rolling process

基于有限元软件MSC.Marc建立了孪晶诱发塑性钢在不同变形参数条件下的二维热-力耦合有限元模型,分析了轧制温度、压下量和异速比对轧件变形区剪切应变和等效应变的影响规律。研究结果表明:同步轧制时,上、下表面节点剪切应变、等效应变呈对称分布,心部节点应变最小,上、下表面节点应变最大。随着异速比的增加,变形区各节点的剪切应变和等效应变逐渐降低,沿轧件厚度方向的分布也逐渐均匀。随着轧制温度的升高,变形区各节点剪切应变和等效应变逐渐减小,但降幅度都较小,轧制温度其影响不显著。随着压下量的升高,各节点剪切应变和等效应变逐渐增大,曲线分布越不均匀。

Based on the finite element software MSC.Marc,a two-dimensional thermo mechanical coupling finite element model of TWIP steel under different deformation parameters was established.The effects of rolling temperature,reduction rate and speed ratio on stress strain and equivalent strain were analyzed.The results showed that during symmetrical rolling,the stress strain and equivalent strain state of the upper and lower surface nodes were symmetrically distributed,that the strain value of the node in the center layer was minimum,and that the strain value of the nodes in the upper and lower surfaces were maximum.With the increase of the speed ratio,the shear strain and equivalent strain of the nodes in the deformation area decreased gradually.With the increase of rolling temperature,the shear strain and equivalent effect of nodes in the deformation zone decreased gradually,but the decrease amplitude was small,and the effect of rolling temperature was not significant.With the increase of the reduction rate,the shear strain and equivalent strain of the nodes gradually increased,the distribution curves were more uneven.