A model for the plastic deformation that occurs in metal cutting, based on dislocation mechanics, is presented. The model explains the fundamental deformation structure that develops during machining and is based on the well known Cottrell-Stokes Law, wherein the flow stress is partitioned into two parts; an athermal part which occurs in the shear fronts (or shear bands); and a thermal part which occurs in the lamella regions. The deformation ...
two methods of continuous extrusion of aluminum are discussed and compared, both with each other, and with traditional wire drawing processes. conform, the older of the two friction actuated continuous extrusion processes is seen as basically a circular process using three-sided friction gripping to drive the feedstock. linex, presented for the first time, is fundamentally a linear continuous extrusion process using two-sided gripping of feedstock with the ungripped surfaces being ...
In transmission electron microscopy, the first-line technique of specimen preparation in the biological sciences is ultramicrotomy, simple orthogonal (i.e., two force cutting) cutting of tissue that is embedded in a variety of plastics. This paper is concerned with the deformation process by which the section is formed and the theoretical considerations regarding the interaction of the tool with embedding materials. (Author, modified). ANNOTATION: Ultramicrotomy of embedding plastics.
the reliable and effective utilization of high strength materials in the aerospace industries is predicated on the fabrication of components with minimum surface damage. the act of creating a surface using any one of the common surface generating methods such as turning, milling, grinding or the electrically assisted methods such as electrical discharge machining, electro- chemical machining, electro-chemical machining, etc., leads to significant changes in the properties of the material ...
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