Measurement and Analysis of Thermal Inhomogeneities Developed During the Plastic Deformation of Copper,
Abstract
A photon detection system was designed and calibrated for the measurement of thermal changes encountered during the plasticity of metals. Calibrations were made of the thermal response of the detection system, the optical effects of changes in surface topography and changes in the thermal radiating characteristics of a metal that arise during plasticity. Then the radiant energy emitted from electrolytic tough pitch copper during plastic extension was recorded with the photon detection system. Abrupt changes in emission were correlated with the intermittent plastic action of Luders bands. The tendency for plasticity to continue to develop by the functioning of individual Luders bands throughout deformation to fracture was established with radiation measurements. The conversion of mechanical work into heat was considered in terms of dislocation motion and annihilation. Two new models of energy conversion through dislocation annihilation were developed to account for heating. The localized temperature changes developed within Luders bands during plasticity were estimated from the radiation data. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1972
- Accession Number
- AD0756416
Entities
People
- Gerald L. Moss
Organizations
- Ballistic Research Laboratory