scholarly journals Determination of the elastic moduli of CVD graphene by probing graphene/polymer Bragg stacks

2D Materials ◽  
2021 ◽  
Author(s):  
Bohai Liu ◽  
Christos Pavlou ◽  
Zuyuan Wang ◽  
Yu Cang ◽  
Costas Galiotis ◽  
...  
2005 ◽  
Author(s):  
K.L. Williams ◽  
R. Stein ◽  
T. Wen ◽  
R.E. Francois
Keyword(s):  
Sea Ice ◽  

2004 ◽  
Vol 19 (8) ◽  
pp. 2437-2447 ◽  
Author(s):  
J.W. Leggoe

Nanoindentation of the reinforcement in a particulate reinforced metal matrix composite (PR MMC) enables direct investigation of reinforcement properties within the finished material. Mismatch between the elastic moduli of the reinforcement and matrix creates a “secondary indentation” effect, whereby the stiffer reinforcement particles themselves “indent” the more compliant matrix. A finite-element investigation was undertaken to quantify the additional penetration arising under secondary indentation for spherical and cylindrical particles. Modification of Sneddon’s equation for a flat punch by a scalar particle shape factor provided an accurate estimate of the additional penetration. The modified equation was combined with the analysis of Field and Swain to extract the particle elastic modulus from results obtained using a spherical indenter under a multiple partial-unloading indentation regime. The resulting methodology was used to determine the elastic moduli of silicon carbide particles and MicralTM microspheres in two aluminum-matrix PR MMCs.


Rochelle salt owes its importance to the fact that it possesses piezo-electric properties which are much greater in magnitude than in the case of any other known Substance. Nicholson points out that whereas the larger of the two piezo-electric moduli of quartz is 0.0677 E. S. U. per kilogram, a usual value for Rochelle salt is 10 E. S. U., and this can be increased to 200 E. S. U. per kilogram for crystals grown in a special manner so as to develop what is known as a composite structure.


2001 ◽  
Vol 79 (4) ◽  
pp. 473-475 ◽  
Author(s):  
F. C. Peiris ◽  
U. Bindley ◽  
J. K. Furdyna ◽  
Hyunjung Kim ◽  
A. K. Ramdas ◽  
...  

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