Abstract
The strain-relaxation (creep) behavior of randomly cut metallic networks (of aluminum and copper) near the percolation threshold are studied here experimentally. A crossover from Kohlrausch-type stretched-exponential behavior, for time t less than a crossover time ${t}_{c}$, to a normal (exponential) relaxation behavior, for t>${t}_{c}$, is observed. The crossover time (${t}_{c}$) and the relaxation time are found to diverge as disorder approaches the percolation threshold. The value of the stretched-exponential exponent is compared with that expected theoretically from anomalous diffusion on fractals. Such crossover behavior for strain relaxation in percolating networks is compared with the magnetic-relaxation behavior of dilute Ising magnets in two and three dimensions, studied using Monte Carlo simulation techniques. These observations confirm a classical localization or anomalous-diffusion origin of the stretched-exponential relaxation behavior.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
