Aspect ratio-dependent nanoindentation behavior of Cu64Zr36 metallic glass nanopillars investigated by molecular dynamics simulations

2020 ◽  
Vol 128 (8) ◽  
pp. 084303
Author(s):  
Wen-Ping Wu ◽  
D. Şopu ◽  
X. Yuan ◽  
J. Eckert
Keyword(s):  
Molecular Dynamics ◽  
Aspect Ratio ◽  
Metallic Glass ◽  
Molecular Dynamics Simulations ◽  
Ratio Dependent ◽  
Dynamics Simulations

Experimental Studies and Molecular Dynamics Simulations of the Sliding Contact of Metallic Glass

2000 ◽  
Vol 644 ◽  
Author(s):  
Xi-Yong Fu ◽  
Michael L. Falk ◽  
David A. Rigney
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
Molecular Dynamics Simulations ◽  
Bulk Metallic Glass ◽  
Amorphous Material ◽  
Experimental Studies ◽  
Sliding Contact ◽  
Atomic Scale ◽  
Sliding Interface ◽  
Dynamics Simulations

AbstractTribological properties of bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 were studied experimentally using a pin/disk geometry without lubrication. Experimental observations were compared with 2D molecular dynamics simulations of amorphous material in sliding contact. The friction coefficient and the wear rate of bulk metallic glass (BMG) depend on normal load and test environment. The sliding of annealed BMG re-amorphizes devitrified material. A mechanically mixed layer is generated during sliding; this layer has enhanced oxygen content if the sliding is in air. The MD simulations show that atomic scale mixing occurs across the sliding interface. The growth kinetics of the mixing process scales with the square root of time. In the simulations, a low density region is generated near the sliding interface; it corresponds spatially to the softer layer detected in experiments. Subsurface displacement profiles produced by sliding and by simulation are very similar and are consistent with the flow patterns expected from a simple Navier-Stokes analysis when the stress state involves both compression and shear.

Modelling the Mechanical Behavior of Polymer-Based Nanocomposites

2012 ◽  
Vol 730-732 ◽  
pp. 543-548
Author(s):  
Alexandre Correia ◽  
S. Mohsen Valashani ◽  
Francisco Pires ◽  
Ricardo Simões
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Aspect Ratio ◽  
Mechanical Behavior ◽  
Molecular Dynamics Simulations ◽  
Initial Orientation ◽  
Fiber Concentration ◽  
Experimental Knowledge ◽  
Dynamics Simulations ◽  
Two Parameters

Molecular dynamics simulations were employed to analyze the mechanical properties of polymer-based nanocomposites with varying nanofiber network parameters. The study was focused on nanofiber aspect ratio, concentration and initial orientation. The reinforcing phase affects the behavior of the polymeric nanocomposite. Simulations have shown that the fiber concentration has a significant effect on the properties, with higher loadings resulting in higher stress levels and higher stiffness, matching the general behavior from experimental knowledge in this field. The results also indicate that, within the studied range, the observed effect of the aspect ratio and initial orientation is smaller than that of the concentration, and that these two parameters are interrelated.

Sign in / Sign up

Export Citation Format

Share Document