Influence of High Hydrostatic Pressure Extrusion on Mechanical Behavior of Materials.

摘要

Hydrostatic extrusion is a promising new metal working process. The intent of this research program is to relate the process variables of hydrostatic extrusion to the microstructure and properties of a wide variety of extruded materials and to analyze this process of metal forming by theoretical mechanics. A hydrostatic extrusion press has been designed and built for these experiments. This device is capable of subjecting a 3/8 inch diameter billet to 500,000 psi of hydrostatic pressure. Special tooling has been built for the mechanical testing of the experimentally extruded materials. Certain speciallized specimen materials preparation equipment has been set up, for example a mechanical attritor to facilitate the preparation of particulate composite alloys. The theoretical mechanics analysis has been directed toward the development of a practical finite element analysis of the mechanics of the hydrostatic extrusion process. Progress has been made toward a physically and mathematically rigorous formulation of the problem amenable to numerical solution by means of finite element computer methods.