Abstract
DR. F. KÖRBER, director of the Kaiser Wilhelm-Institut für Eisenforschung, Düsseldorf, delivered the twenty-second annual May lecture of the Institute of Metals in London on May 11, on “The Plastic Deformation of Metals”. Basing his remarks on the results of a series of investigations conducted at Düsseldorf during recent years, Dr. Körber dealt with the stress relationships and also with the course of the flow of the material during the most important of the mechanical shaping processes. Discussions were entered into on the conditions requisite for the commencement of plastic flow and also on the possibility of drawing conclusions from the resulting flow phenomena as to the distribution of stress in the material at the inception of deformation. The disturbances in the material in consequence of the more marked deformations in drawing, extrusion, and rolling were traced by a suitable method of investigation. The results were compared with the deformation structures obtained by X-ray methods. The knowledge of the deformation processes so obtained enabled conclusions to be drawn as to the energy or power used in the shaping operations. An exact analysis of the course of deformation in the transition zone led to estimates of the internal losses during the alterations in form. Quantitative treatment of the stress relationships which occurred in the zone of deformation is possible in so far as the pressure created at the surface of contact between the tool and the material is known by actual measurements. From the results of determinations along the roll-gap of the pressure between the rolls and the stock being rolled, a complete quantitative presentation of the distribution of stress in the transition zone between the rolls has been formulated.
Article PDF
Rights and permissions
About this article
Cite this article
Plastic Deformation of Metals. Nature 129, 717 (1932). https://doi.org/10.1038/129717b0
Issue Date:
DOI: https://doi.org/10.1038/129717b0