On some basic aspects of flexoelectricity in the mechanics of materials

2021 ◽  
Vol 166 ◽  
pp. 103499
Author(s):  
Anqing Li ◽  
Binglei Wang ◽  
Shengyou Yang
Keyword(s):  
Mechanics Of Materials

scholarly journals Performance of SCAN Meta-GGA Functionals on Nonlinear Mechanics of Graphene-Like g-SiC

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 120
Author(s):  
Qing Peng
Keyword(s):  
Mechanical Properties ◽  
Density Functional ◽  
Large Strains ◽  
Two Dimensional ◽  
Nonlinear Mechanics ◽  
Generalized Gradient ◽  
Mechanics Of Materials ◽  
Nonlinear Mechanical ◽  
Direct Band ◽  
Simulations And Modeling

Although meta-generalized-gradient approximations (meta-GGAs) are believed potentially the most accurate among the efficient first-principles calculations, the performance has not been accessed on the nonlinear mechanical properties of two-dimensional nanomaterials. Graphene, like two-dimensional silicon carbide g-SiC, has a wide direct band-gap with applications in high-power electronics and solar energy. Taken g-SiC as a paradigm, we have investigated the performance of meta-GGA functionals on the nonlinear mechanical properties under large strains, both compressive and tensile, along three deformation modes using Strongly Constrained and Appropriately Normed Semilocal Density Functional (SCAN) as an example. A close comparison suggests that the nonlinear mechanics predicted from SCAN are very similar to that of Perdew-Burke-Ernzerhof (PBE) formulated functional, a standard Density Functional Theory (DFT) functional. The improvement from SCAN calculation over PBE calculation is minor, despite the considerable increase of computing demand. This study could be helpful in selection of density functionals in simulations and modeling of mechanics of materials.

Mechanics of Materials

2020 ◽  
Author(s):  
Anthony Bedford ◽  
Kenneth M. Liechti
Keyword(s):  
Mechanics Of Materials

Research on Three-Dimensional Displacement Measurement Technology of the Beating Heart

2011 ◽  
Vol 403-408 ◽  
pp. 5182-5186
Author(s):  
Sheng Yi Yang ◽  
An Gu ◽  
Meng Li ◽  
Chang Jian Lu
Keyword(s):  
Heart Surgery ◽  
Classical Mechanics ◽  
Three Dimensional ◽  
Beating Heart ◽  
Displacement Measurement ◽  
Surgical Instruments ◽  
Analytical Models ◽  
Measurement Technology ◽  
Position Measurement ◽  
Mechanics Of Materials

In robotic-assisted heart surgery, the method of canceling the relative motion between the surgical site on the heart and the surgical instruments was introduced in this paper. A whisker sensor was designed for three dimensional position measurement in beating heart surgery. Analytical models were developed according to the classical mechanics of materials, and theoretical formulas were derived for displacement measurement. Feasibility and effectiveness of the method were verified by simulation experiments. We can obtain measurements by loading displacement to the whisker sensor, and draw conclusions by comparing the measurements.

Mechanics of Materials in Lunar Base Design

1993 ◽  
Vol 46 (6) ◽  
pp. 268-271 ◽  
Author(s):  
A. Smith
Keyword(s):  
Space Environment ◽  
Fatigue Properties ◽  
Design Features ◽  
Alternative Design ◽  
Size And Shape ◽  
Mechanics Of Materials ◽  
Actual Design ◽  
Base Design

The construction of a lunar base has been thought about for almost five decades. The earliest concepts dealt with size and shape concepts rather than actual design of structures and equipment. As the exploration of space has received emphasis in more recent times, the need to consider the factors of design and design approaches have received more attention. It still is not possible to completely rationalize the design of a habitat, for example, but we are now very aware of the need to include the fracture and fatigue properties of the materials of which the hardware of a lunar infrastructure is constructed. It is reasonably certain that the same techniques used for terrestrial designs can be used for lunar bases provided the space environment is taken into account. The extensive amount of research on fracture and fatigue that has been and is being conducted, along with the ease and speed of computation of their effects on alternative design features will be invaluable in providing a highly reliable, safe lunar base.

Mechanics of materials

1952 ◽  
Vol 254 (6) ◽  
pp. 549
Author(s):  
E.W. Hammer
Keyword(s):  
Mechanics Of Materials

Resistance of materials. Laboratory works. 4th edition

2016 ◽  
Author(s):  
Sergej Evtushenko ◽  
Viktor Logvinov
Keyword(s):  
International System ◽  
Statistical Processing ◽  
Physicomechanical Characteristics ◽  
Mechanics Of Materials ◽  
Ferrous Metals ◽  
System Of Units ◽  
Construction Mechanics ◽  
Steel Cast ◽  
Control Devices ◽  
And Control

Data on laboratory works on resistance of materials are provided, the assessment of errors of results of measurements and experiments is given, statistical processing of experimental data is in detail stated. The book contains information on nondestructive methods and control devices of characteristics and diagnostics of materials and designs. In a grant the International system of units (SI) (tab. 1 of the Appendix) is used, designations of sizes are accepted according to the international recommendations of ISO. Data on physicomechanical characteristics of steel, cast iron, non-ferrous metals, wood and polymers and the allowed tension for them are provided in tab. 2-8 of the Appendix. The grant is intended for the students studying courses of resistance of materials, mechanics of materials and designs, applied mechanics, construction mechanics and construction designs.

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