ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
With the development of material science, especially as MEMS/NEMS are playing amore and more important role in modern engineering, some mechanical behaviors of materials, e.g.,fracture, shear instability, need to be investigated from multidisciplinary perspective. The moleculardynamics (MD) simulations are performed on single-crystal copper block under simple shear toinvestigate the size and strain rate effects on the mechanical responses of face-centered cubic (fcc)metals. It is shown that the yield stress decreases with the specimen size and increases with thestrain rate. Based on the theory of dislocation nucleation, a modified power law is proposed topredict the scaling behavior of fcc metals. In the MD simulations with different strain rates, acritical strain rate exists for each single-crystal copper block of given size, below which the yieldstress is nearly insensitive to the strain rate. A hyper-surface is therefore formulated to describe thecombined size and strain rate effects on the plastic yield stress of fcc metals
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.875.pdf
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