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Record Details

Record 56 of 1462
Flow stress model in metal cutting
Author and Affiliation:
Black, J. T.(Ohio State University, Columbus, Ohio, United States)
Abstract: 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 envokes the presence of a cellular dislocation distribution which always exists in the material ahead of the shear process. This 'alien' dislocation distribution either exists in the metal prior to cutting or is produced by the compressive stress field which operates in front of the shear process. The magnitude of the flow stress and direction of the shear are shown to be correlated to the stacking fault energy of the metal being cut. The model is tested with respect to energy consumption rates and found to be consistent with observed values.
Publication Date: Dec 01, 1978
Document ID:
19790067093
(Acquired Dec 01, 1995)
Accession Number: 79A51106
Subject Category: MECHANICAL ENGINEERING
Report/Patent Number: ASME PAPER 78-WA/PROD-27
Document Type: Conference Paper
Publisher Information: United States
Meeting Information: American Society of Mechanical Engineers, Winter Annual Meeting; Dec. 10-15, 1978; San Francisco, CA
Meeting Sponsor: American Society of Mechanical Engineers
Contract/Grant/Task Num: NSG-3164
Financial Sponsor: NASA; United States
Organization Source: Ohio State Univ.; Columbus, OH, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: METAL CUTTING; PLASTIC DEFORMATION; PLASTIC FLOW; ADIABATIC CONDITIONS; CRYSTAL DEFECTS; DISLOCATIONS (MATERIALS); DYNAMOMETERS; METASTABLE STATE; MICROPHOTOGRAPHS; SHEAR PROPERTIES; STACKING FAULT ENERGY; STRAIN HARDENING; STRAIN RATE; STRESS DISTRIBUTION; TABLES (DATA); TEMPERATURE EFFECTS
Imprint And Other Notes: American Society of Mechanical Engineers, Winter Annual Meeting, San Francisco, Calif., Dec. 10-15, 1978, 13 p.
Availability Source: Other Sources
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