A thermo-plastic shear instability criterion applied to surface cracking in upsetting and related processes
- 1 July 1981
- journal article
- research article
- Published by SAGE Publications in The Journal of Strain Analysis for Engineering Design
- Vol. 16 (3) , 159-164
- https://doi.org/10.1243/03093247v163159
Abstract
The workability of wire and rod in upsetting and related processes is dependent on the ductility exhibited by the expanding free surface. From previous measurements of the equatorial strain histories during incremental upsetting of cylinders, linear fracture conditions for a large number of materials of engineering importance have been derived. A simple theoretical explanation of the experimentally observed fracture condition is given. This is done using the concept of a thermo-plastic shear instability criterion. It is shown that one mode of shear instability coincides with the observed straight-line fracture condition.Keywords
This publication has 3 references indexed in Scilit:
- Adiabatic Plastic DeformationAnnual Review of Materials Science, 1979
- Thermal Instability Strain in Dynamic Plastic DeformationPublished by Springer Nature ,1973
- Deformation Characteristics and Ductile Fracture of 1040 Steel in Simple Upsetting of Solid Cylinders and RingsJournal of Engineering for Industry, 1970