Shock Loading of Bone-Inspired Metallic Nanocomposites |
| Journal |
Solid State Phenomena (Volume 139) |
| Volume |
Theory, Modeling and Numerical Simulation |
| Edited by |
Veena Tikare, Graeme E. Murch, Frédéric Soisson and Jeung Ku Kang |
| Pages |
11-22 |
| DOI |
10.4028/www.scientific.net/SSP.139.11 |
| Online since |
April, 2008 |
| Authors |
Dipanjan Sen,
Markus J. Buehler
|
| Keywords |
Atomistic Simulation, Bone, Metal Composites, Nacre, Nanocomposite, Nanocrystal, Shock Loading |
| Abstract |
Nanostructured composites inspired by structural biomaterials such as bone and nacre
form intriguing design templates for biomimetic materials. Here we use large scale molecular
dynamics to study the shock response of nanocomposites with similar nanoscopic structural features
as bone, to determine whether bioinspired nanostructures provide an improved shock mitigating
performance. The utilization of these nanostructures is motivated by the toughness of bone under
tensile load, which is far greater than its constituent phases and greater than most synthetic
materials. To facilitate the computational experiments, we develop a modified version of an
Embedded Atom Method (EAM) alloy multi-body interatomic potential to model the mechanical
and physical properties of dissimilar phases of the biomimetic bone nanostructure. We find that the
geometric arrangement and the specific length scales of design elements at nanoscale does not have
a significant effect on shock dissipation, in contrast to the case of tensile loading where the
nanostructural length scales strongly influence the mechanical properties. We find that interfacial
sliding between the composite’s constituents is a major source of plasticity under shock loading.
Based on this finding, we conclude that controlling the interfacial strength can be used to design a
material with larger shock absorption. These observations provide valuable insight towards
improving the design of nanostructures in shock-absorbing applications, and suggest that by tuning
the interfacial properties in the nanocomposite may provide a path to design materials with
enhanced shock absorbing capability. |
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