Recent Findings About Combined Size And Rate
Effects On Material Properties
Author(s)
Z. Chen & S. Jiang
Abstract
The need for modeling and simulating multiscale structural responses to extreme
loading conditions has brought about the challenging tasks of bridging different
spatial and temporal scales within a unified framework. Based on the available
experimental and computational capabilities, a simple approach has been
proposed to formulate a hyper-surface in both spatial and temporal domains to
predict combined specimen size and loading rate effects on the material
properties. A systematic investigation has been performed over the last several
years to understand the combined size, rate and thermal effects on the properties
and deformation patterns of representative materials with different
nanostructures and under various types of loading conditions. In this
presentation, recent findings are presented about combined size and rate effects
on the material properties of single crystal copper nanobeams under impact
loading, with a focus on the link between the inverse Hall-Petch phenomenon
and classical Hall-Petch phenomenon. It appears from the preliminary results
that the inverse Hall-Petch behavior in single crystal materials is mainly due to
the formation and evolution of disordered atoms as compared with the physics
behind the inverse Hall-Petch behavior in nanocrystalline materials.
Keywords: size effect, rate effect, thermal effect, multiscale modeling and
simulation, nanostructures.
Keywords
size effect, rate effect, thermal effect, multiscale modeling and
simulation, nanostructures.
Related Book
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