Size Effects Associated with Microcompression Experiments on Single-Crystal Magnesium

2011 ◽  
pp. 41-42 ◽  
Author(s):  
Cynthia M. Byer ◽  
K. T. Ramesh
Keyword(s):  
Single Crystal ◽  
Size Effects

Quasicontinuum Simulation of Uniaxial Tension of Single Crystal Copper Nanowire

2011 ◽  
Vol 694 ◽  
pp. 200-204
Author(s):  
Xing Lei Hu ◽  
Ying Chun Liang ◽  
Jia Xuan Chen ◽  
Hong Min Pen
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Single Crystal ◽  
Size Effects ◽  
Tension Test ◽  
Quasicontinuum Method ◽  
Single Crystal Copper ◽  
Copper Nanowire

Quasicontinuum simulations of tension test of single crystal copper nanowire are performed to analyze deformation mechanism of tension process and size effects of mechanical properties. New tension models of nanowire are constructed by using quasicontinuum method, which has combined molecular dynamics and finite element method. Tension processes of three different length nanowires without notches and those with notches are simulated. Yield strength and elastic modulus are calculated according to the obtained load-displacement curves. Finally, the results show that the mechanical properties of copper nanowire have obvious size effect and the notches have obvious influence on the mechanical properties.

Depth-Dependent Hardness Characterization by Nanoindentation using a Berkovich Indenter with a Rounded Tip

2005 ◽  
Vol 875 ◽  
Author(s):  
Ju-Young Kim ◽  
David T. Read ◽  
Dongil Kwon
Keyword(s):  
Single Crystal ◽  
Size Effects ◽  
Function Method ◽  
Characteristic Length ◽  
Berkovich Indenter ◽  
Indentation Size ◽  
Height Difference ◽  
Force Microscopy ◽  
Atomic Force ◽  
Fused Quartz

AbstractThe height difference Δhb between the ideally sharp Berkovich indenter tip and a Δhb rounded tip was measured by direct observation using atomic force microscopy (AFM). The accuracy of the indirect area function method for measuring h was confirmed. The Δhb indentation size effects (ISE) in (100) single crystal copper, (100) single crystal tungsten, and fused quartz were characterized by applying the ISE model considering the rounded tip effect. The model fits the data these materials well, even though fused quartz does not deform by dislocations. However, a very small value of the ISE characteristic length h' was obtained for fused quartz. The present h' value for (100) copper is 32% larger than a previously-measured value for polycrystalline copper. This may indicate that grain boundaries suppress the dislocation activity envisioned in the ISE model.

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