Prediction on the Theoretical Strength of Diamond, c-Bn, Cu and CeO 2

2021 ◽  
Author(s):  
Zhao Liu ◽  
Biao Wang
Keyword(s):  
Theoretical Strength

On the Shape of Field-Ion Emitters

1976 ◽  
Vol 34 ◽  
pp. 520-521
Author(s):  
H.C. Eaton ◽  
B.N. Ranganathan ◽  
T.W. Burwinkle ◽  
R. J. Bayuzick ◽  
J.J. Hren
Keyword(s):  
Grain Boundary ◽  
Spherical Shape ◽  
Theoretical Strength ◽  
Evaporation Process ◽  
Field Evaporation ◽  
Geometric Information ◽  
Field Ion Microscopy ◽  
Considerable Error ◽  
True Shape ◽  
Ion Microscopy

The shape of the emitter is of cardinal importance to field-ion microscopy. First, the field evaporation process itself is closely related to the initial tip shape. Secondly, the imaging stress, which is near the theoretical strength of the material and intrinsic to the imaging process, cannot be characterized without knowledge of the emitter shape. Finally, the problem of obtaining quantitative geometric information from the micrograph cannot be solved without knowing the shape. Previously published grain-boundary topographies were obtained employing an assumption of a spherical shape (1). The present investigation shows that the true shape deviates as much as 100 Å from sphericity and boundary reconstructions contain considerable error as a result.Our present procedures for obtaining tip shape may be summarized as follows. An empirical projection, D=f(θ), is obtained by digitizing the positions of poles on a field-ion micrograph.

Filamentary crystals with almost the theoretical strength of perfect crystals

1959 ◽  
Vol 67 (4) ◽  
pp. 625-662 ◽  
Author(s):  
E.M. Nadgornyi ◽  
Yurii A. Osip'yan ◽  
M.D. Perkas ◽  
V.M. Rozenberg
Keyword(s):  
Theoretical Strength

Theoretical strength and charge redistribution of fcc Ni in tension and shear

2008 ◽  
Vol 20 (33) ◽  
pp. 335216 ◽  
Author(s):  
Yue-Lin Liu ◽  
Ying Zhang ◽  
Hong-Bo Zhou ◽  
Guang-Hong Lu ◽  
Masanori Kohyama
Keyword(s):  
Theoretical Strength ◽  
Charge Redistribution

Failure Mechanism of Tungsten Heavy Alloy for Mould

2011 ◽  
Vol 341-342 ◽  
pp. 432-435
Author(s):  
Wei Huang ◽  
Ya Feng Li ◽  
Kai Wen Tian ◽  
Fu Jun Shang ◽  
Yong Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Failure Mechanism ◽  
Matrix Composite ◽  
External Load ◽  
High Strength ◽  
Strength Level ◽  
Heavy Alloy ◽  
Theoretical Strength ◽  
Tungsten Heavy Alloy ◽  
The Real

The failure mechanism of tungsten matrix composite was studied with microscale numerical simulation. The results show that high strength tungsten particles are the real loading elements of composite, its strength level embodies the whole property of the composite to some extent. The real stress in tungsten particles is much higher than the external load, so failure may take place when the external load is less than the theoretical strength of tungsten particles.

scholarly journals A Maugis–Dugdale cohesive solution for adhesion of a surface with a dimple

2017 ◽  
Vol 14 (127) ◽  
pp. 20160996 ◽  
Author(s):  
A. Papangelo ◽  
M. Ciavarella
Keyword(s):  
Adhesive System ◽  
Theoretical Strength ◽  
Air Entrapment ◽  
Qualitative Comparison ◽  
Cohesive Model ◽  
Full Contact ◽  
Dry Adhesives ◽  
Simple Equations ◽  
Scale Roughness ◽  
Tabor Parameter

We study the adhesion of a surface with a ‘dimple’ which shows a mechanism for a bi-stable adhesive system in surfaces with spaced patterns of depressions, leading to adhesion enhancement, high dissipation and hysteresis. Recent studies were limited mainly to the very short range of adhesion (the so-called JKR regime), while we generalize the study to a Maugis cohesive model. A ‘generalized Tabor parameter’, given by the ratio of theoretical strength to elastic modulus, multiplied by the ratio of dimple width to depth has been found. It is shown that bistability disappears for generalized Tabor parameter less than about 2. Introduction of the theoretical strength is needed to have significant results when the system has gone in full contact, unless one postulates alternative limits to full contact, such as air entrapment, contaminants or fine scale roughness. Simple equations are obtained for the pull-off and for the full contact pressure in the entire set of the two governing dimensionless parameters. A qualitative comparison with results of recent experiments with nanopatterned bioinspired dry adhesives is attempted in light of the present model.

Titanium Resistance to Deformation Near the Theoretical Strength Limit

2018 ◽  
Vol 56 (6) ◽  
pp. 873-877 ◽  
Author(s):  
S. I. Ashitkov ◽  
P. S. Komarov ◽  
E. V. Struleva ◽  
M. B. Agranat
Keyword(s):  
Theoretical Strength ◽  
Strength Limit ◽  
Resistance To Deformation
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