Strain rate dependence of the growth rate of grain boundary cavities during the high cycle high temperature fatigue of copper
High temperature fully reversed fatigue tests of high purity copper were made as a function of stress amplitude. A mean cavity volume V{sub p} and corresponding number density of cavities N{sub p} were determined from the total cavity volume fraction V{sub v} obtained from precision density measurements (PDM) and the total cavity surface area S{sub v} calculated from small angle neutron scattering (SANS) measurements. Under the range of stress amplitudes tested, the plastic strain rate d{epsilon}{sub p}/dt was found to cover three orders of magnitude. The results of these tests of the influence of stress amplitude on cavity growth were combined with previous results in which the frequency of cycling was varied. It was found that the cavity growth rate correlates well with the measured plastic strain and stress amplitude through the relation dV{sub p}/dt {proportional{underscore}to} (d{epsilon}{sub p}/dt){sup 0.45} {proportional{underscore}to} {Delta}{sigma}{sup 2}.
- Research Organization:
- National Inst. of Standards and Technology, Gaithersburg, MD (US)
- Sponsoring Organization:
- National Science Foundation (NSF)
- OSTI ID:
- 20014191
- Resource Relation:
- Conference: 1999 TMS Fall Meeting, Julia R. Weertman Symposium: Advanced Materials for the 21st Century, Cincinnati, OH (US), 10/31/1999--11/04/1999; Other Information: PBD: 1999; Related Information: In: Advanced materials for the 21st century: The 1999 Julia R. Weertman symposium, by Chung, Y.W.; Dunand, D.C.; Liaw, P.K.; Olson, G.B. [eds.], 585 pages.
- Country of Publication:
- United States
- Language:
- English
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