부산대학교 도서관

In this paper, a tube extrusion process by finite element was analyzed, using coupled Eulerian-Lagrangian method (CEL) due to the severe deformation that material presents and thereby avoids distortion of the mesh and adaptive meshing used in Lagrangian models, in order to obtain stress distribution, strains, extrusion force, and flow material behavior. Four isothermal models were performed by modifying the sensitivity of ram speed using discrete rigid tools with general contact option to simulate the interaction between them; 7005 aluminum was considered as the material to be extruded. In order to reduce high computational time application, speed was increased to observe its influence on the results, in other words the variations between the models. As a consequence of this analysis, it was found that while the kinetic energy does not exceed 5 to 10 % of whole internal energy, material flow behavior and stress level are not affected. [ABSTRACT FROM AUTHOR]