Desenvolvimento de um equipamento HPT (High Pressure Torsion) adaptado a uma máquina de ensaio de compressão de 200T

Abstract

The High-Pressure Torsion (HPT) processing is a Severe Plastic Deformation (SPD) technique whereby attains excellent grain refinement in polycrystalline materials through imposition of very high strain rate. The HPT method consists in applying compression load simultaneously to a torsional straining on a small disk sample which is placed between two anvils. The bulk Ultrafine-Grained (UFG) materials achieved by HPT processing leads to enhancement of materials mechanical properties unusually found in any others SPD techniques or conventional thermomechanical process. Thus, this presented Masters Thesis approaches the development of High Pressure Torsion (HPT) device as a virtual prototype designed by 3D CAD-platform software assembled in a compression-testing machine with load capacity of 200 tons. In addition, the dimensioning and specification of the mechanical and electrical components of the equipment proposed was undertaken by the analytical methods and Finite Elements Methods (FEM) using CAE-platform. Furthermore, the HPT design was outlined considering the technical parameters required for HPT processing such as torque, hydrostatic pressure, materials types and samples diameter. The internal dimensions of the compression machine were also taken into account. The HPT twisting unit which induces the torsional shear straining in the specimen its formed by a transmission system of involute spur gear teeth. For allowing the processing of two distinct types of testing materials using the same apparatus it was added a movement system constituted primarily by profile rail guides. Therefore, the longitudinal movement enables the assembling and disassembling of the HPT device.