INFLUENCE OF ROLL DIAMETERS ON DEFORMATION BEHAVIOUR OF HIGH TEMPERATURE SUPERCONDUCTING TAPE  

作　　者：LEI Liping ZHAO Yinghong ZENG Pan 

机构地区：[1]Key Laboratory for Advanced Materials Processing Technology, Beijing 100084, China [2]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Journal of Mechanical Engineering》2007年第4期75-78,共4页中国机械工程学报（英文版）

基　　金：Selected from Proceedings of the 7th International Conference on Frontiers of Design and Manufacturing(ICFDM'2006);This project is supported by National Natural Science foundation of China(No.5030515);National Science Fund for Distinguished Young Scholars of China(No.59825117).

摘　　要：During plastic process, the material flow is strongly influenced by the contact area between deformed workpiece and die. In rolling process, difference of roll diameter makes the contact area between roll and deformed tape different, which leads to different material flow and the distribution of powder density. A numerical modelling of the first rolling process for 61-filament high temperature superconducting tape is constructed and the influences of roll diameters on deformation behavior of the tape are discussed. It can be found that the BiSrCaCuO （BSCCO） powder in the center of the tape has higher relative density than those in the periphery of the tape during rolling process. With the increase of roll diameter, the length of the contact arc in the roll gap expands which lead to the increasing of transversal strain and the decreasing of the related longitudinal strain. It makes the value of longitudinal strain ratio decrease gradually, which decreases the possibility of occurrence of the transversal shear band, simultaneously it increases the risk of occurrence of longitudinal crack.During plastic process, the material flow is strongly influenced by the contact area between deformed workpiece and die. In rolling process, difference of roll diameter makes the contact area between roll and deformed tape different, which leads to different material flow and the distribution of powder density. A numerical modelling of the first rolling process for 61-filament high temperature superconducting tape is constructed and the influences of roll diameters on deformation behavior of the tape are discussed. It can be found that the BiSrCaCuO （BSCCO） powder in the center of the tape has higher relative density than those in the periphery of the tape during rolling process. With the increase of roll diameter, the length of the contact arc in the roll gap expands which lead to the increasing of transversal strain and the decreasing of the related longitudinal strain. It makes the value of longitudinal strain ratio decrease gradually, which decreases the possibility of occurrence of the transversal shear band, simultaneously it increases the risk of occurrence of longitudinal crack.

关 键 词：Roll diameter Rolling process Filament Relative density 

分 类 号：TG1[金属学及工艺—金属学]