THE INFLUENCE OF ULTRASOUND ON THE MECHANICAL PROPERTIES OF COPPER,
Abstract
Red copper, subjected to the influence of ultrasonic oscillations by 19.5 kilocycle frequency at temperatures of 600-700 degrees in 15-20 minutes, changes from the plastic state into a brittle state. The increase of temperature and increase of scoring time causes decrease of durability and plasticity during simultaneous lowering of the microhardness. The electric resistance of copper is significantly increased during the increase of time and temperature scoring. The action of ultrasound on copper at increased temperatures manifests in the appearance of micro-cracks on grain boundaries which culminates to the subsequent brittle destruction at room temperature. The scoring of copper at temperatures of 100 to 300 degrees in 20 minutes causes lowering of the durability without lowering its plasticity. The scoring of the same duration at temperatures lower than 100 degrees does not cause visible changes of properties and structure in copper. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1963
- Accession Number
- AD0605873
Entities
People
- I. V. Chernenko
- V. S. Cherkashin
Organizations
- National Air and Space Intelligence Center