Cyclic loading and residual strains in Cu25%Ag composites
Abstract
The development of high-performance pulsed magnets requires wire materials with good electrical conductivity and higher mechanical strength than can be achieved by pure copper. Cold-drawn Cu/Ag composites are widely discussed as possible candidates. However, an understanding of the co-deformation behavior and the evolution of residual strains are needed since these parameters affect the short- and long-term fatigue performance. Here, we report on neutron-diffraction studies of Cu/25%Ag wires cold-drawn to a strain of 2.6 with cross sections of 4*6 mm^2. The composites were exposed to cyclic mechanical loading (up to 20% of the elastic limit), and the development of residual strains was studied up to 10^6 cycles (at which the wires were found to catastrophically fail). We find that most of the compressive and tensile strain develops in the Ag fibers, and the results are compared with the predictions of anisotropic finite-element modeling.
- Publication:
-
APS Four Corners Section Meeting Abstracts
- Pub Date:
- September 2000
- Bibcode:
- 2000APS..4CF.EA018M