scholarly journals Comparative analysis of the dependence of the bulk elastic modulus of the liquid on pressure and gas factor

2019 ◽  
Vol 1399 ◽  
pp. 055083 ◽  
Author(s):  
A S Lunev ◽  
A A Nikitin ◽  
Y F Kaizer ◽  
A V Lysyannikov ◽  
D A Sokolov ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Comparative Analysis ◽  
Bulk Elastic Modulus

scholarly journals REFINING THE CALCULATION OF THE CAR TRACTION POWER

2019 ◽  
Vol 16 (5) ◽  
pp. 572-579 ◽  
Author(s):  
E. A. Maksimov ◽  
E. P. Chelyabinsk
Keyword(s):  
Elastic Modulus ◽  
Comparative Analysis ◽  
Contact Zone ◽  
Traditional Method ◽  
Traditional Methods ◽  
Friction Forces ◽  
Refined Equation ◽  
Refined Calculation ◽  
Traction Power ◽  
Tangential Friction

Introduction. Traction power of the car is used to determine its traction-speed properties. The purpose of the paper is the calculation refinement of the car traction power.Materials and methods. The authors used the methodology of the refined calculation of the car traction power.Results. The authors carried out the comparative analysis of the refined and traditional methods for calculating traction power. As a result, the authors obtained the refined equation for calculating the traction power, taking into account the elastic modulus, the width of the contact track, the free radius of the wheel, the deflection of the tire and the tangential friction forces in the contact zone. The largest discrepancy between the curve of the vehicle’s traction power calculated by the updated methodology and the curve of the vehicle’s traction power calculated by the traditional method was 26.8%.Discussion and conclusions. The results of the research are useful to specialists of automobile and transport enterprises and masters of universities to compare the traction and speed properties of the various car types.

Molecular dynamics study on the tensile properties of graphene/Cu nanocomposite

2017 ◽  
Vol 06 (03) ◽  
pp. 1750021 ◽  
Author(s):  
Jun Hua ◽  
Zhirong Duan ◽  
Chen Song ◽  
Qinlong Liu
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Comparative Analysis ◽  
Strain Rate ◽  
Ultimate Strength ◽  
Strain Rates ◽  
Single Crystal Copper ◽  
Single Slice

In this paper, the mechanical properties, including elastic properties, deformation mechanism, dislocation formation and crack propagation of graphene/Cu (G/Cu) nanocomposite under uniaxial tension are studied by molecular dynamics (MD) method and the strain rate dependence is also investigated. Firstly, through the comparative analysis of tensile results of single crystal copper (Cu), single slice graphene/Cu (SSG/Cu) nanocomposite and double slice graphene/Cu (DSG/Cu) nanocomposite, it is found that the G/Cu nanocomposites have larger initial equivalent elastic modulus and tensile ultimate strength comparing with Cu and the more content of graphene, the greater the tensile strength of composites. Afterwards, by analyzing the tensile results of SSG/Cu nanocomposite under different strain rates, we find that the tensile ultimate strength of SSG/Cu nanocomposite increases with the increasing of strain rate gradually, but the initial equivalent elastic modulus basically remains unchanged.

Influence of Pressure of Electron Gas on Elastic Property of Metal

2012 ◽  
Vol 602-604 ◽  
pp. 857-860
Author(s):  
Li Jun He
Keyword(s):  
Elastic Modulus ◽  
Potential Energy ◽  
Electron Gas ◽  
Current Method ◽  
Ideal Gas ◽  
Conduction Electrons ◽  
Valence Electrons ◽  
Dirac Distribution ◽  
Atom Potential ◽  
Bulk Elastic Modulus

A balloon filled with electron gas model was built to simulate metal for calculating its bulk elastic. Electron gas obeyed Fermi-Dirac distribution and satisfied with theory of ideal gas. Expression of metal bulk elastic modulus was derived, and the comparison between the new method given in this paper with current method according to theory of atom potential energy on calculation accuracy was also given. It showed that, pressure of electron gas closely related to bulk elastic modulus, and maybe it was the major factor in determining bulk elastic modulus of metal; not all of valence electrons of atom in metal became conduction electrons to form the electron gas; new model of present work is superior to traditional method based on calculating derivative of potential energy.

scholarly journals Comparative Analysis Carried Out on Modern Indentation Techniques for the Measurement of Mechanical Properties: A Review

2020 ◽  
Author(s):  
Saquib Rouf ◽  
Sobura Altaf ◽  
Shezan Malik ◽  
Kaleem Ahmad Najar
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Comparative Analysis ◽  
Contact Area ◽  
Indirect Method ◽  
Indentation Depth ◽  
Depth Of Penetration ◽  
Simple Method ◽  
Indentation Technique ◽  
Force Contact

Nowadays many indentation techniques are being commonly employed for determining some mechanical properties (harness, elastic modulus, toughness, etc.) using simple method of measuring the indentation depth. On the basis of measurement of depth of penetration, indentation technique has be classified into major categories i.e. microindentation and nanoindentation. Nanoindentation technique uses indirect method of determining the contact area as the depth of penetration is measured in nanometers, while in conventional indentation the area in contact is measured by elementary measurement of the residual area after the indenter is removed from the specimen. Dynamic hardness is the best result of dynamic indentation which can be expressed as the ratio of energy consumed during a rapid indentation to the volume of indentation. The parameter which are taken into consideration are indentation depth, contact force, contact area, mean contact pressure.

scholarly journals Water Relation Parameters of the Cortex Tissue of Fresh ‘Fuji’ Apple Fruit Determined by Centrifugation

HortScience ◽  
2011 ◽  
Vol 46 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Xue-Min Hou ◽  
Zi-Hua Wang ◽  
Xi-Min Deng ◽  
Guo-Hui Li
Keyword(s):  
Elastic Modulus ◽  
Osmotic Potential ◽  
Water Relation ◽  
Apple Fruit ◽  
Pressure Potential ◽  
Centrifuge Method ◽  
Turgor Loss Point ◽  
Relative Water ◽  
Fuji Apple ◽  
Bulk Elastic Modulus

This experiment was carried out to obtain a pressure–volume (P-V) curve and Höfler diagram of the cortex tissue of fresh ‘Fuji’ apple fruit (Malus ×domestica Borkh.) with a novel centrifuge method. Based on the P-V curve and Höfler diagram, several water relation parameters of cortex tissue were determined and the interrelationship of these parameters was established. Turgor loss point (TLP) occurred at –1.74 MPa and 73.7% of relative water content (R*). At full hydration, osmotic potential (ψS) was –1.30 MPa and symplastic water accounted for 86.8% of R*. Bulk elastic modulus decreased linearly by 28% as pressure potential declined from 1.30 MPa at full hydration to zero at the TLP. This centrifuge technique can provide a simple and efficient way to determine water relation parameters of fleshy fruits.

The Experimental Research of Carbon Fiber Confined Concrete Considering Strain Rate under Uniaxial Compression

2010 ◽  
Vol 163-167 ◽  
pp. 1485-1488 ◽  
Author(s):  
Yu Min Zhang ◽  
You Po Su ◽  
Jing Yu Su
Keyword(s):  
Elastic Modulus ◽  
Comparative Analysis ◽  
Carbon Fiber ◽  
Strain Rate ◽  
Experimental Research ◽  
Poisson’S Ratio ◽  
Confined Concrete ◽  
Poisson's Ratio ◽  
Growth Strain ◽  
Constraint Ratio

In the three kinds of constraint ratio (ξ = 0.065, ξ= 0.1025, ξ= 0.205), respectively, by the comparative analysis of 55 prism specimens using CFRP confined concrete(strain ratses are 10-5/s-1, 10-4/s-1, 10-3/s-1and 10-2/s-1), the stress-strain curves, strength, strain, elastic modulus and Poisson's ratio were studied at different constraints and different strain rate. The results show that: (1) with the strain rate increased,the inflexion strength and ultimate strength of concrete were improved; (2) with the strain rate increased, the static and dynamic elastic modulus increased slightly; (3) Poisson's ratio increased slightly with the growth strain rate.

Sign in / Sign up

Export Citation Format

Share Document