scholarly journals The analysis of the influence of core compression effect on the determination of the shear modulus of The sandwich panel core

2012 ◽  
Vol 11 (2) ◽  
pp. 5-13
Author(s):  
Jolanta Blaszczuk ◽  
◽  
Zbigniew Pozorski ◽  
Keyword(s):  
Shear Modulus ◽  
Sandwich Panel ◽  
Compression Effect

scholarly journals Dissipation of energy in the environment with turbulent viscosity and a Hill vortex

2019 ◽  
Vol 486 (6) ◽  
pp. 673-674
Author(s):  
G. F. Krymsky
Keyword(s):  
Shear Modulus ◽  
Mechanical Energy ◽  
Turbulent Viscosity ◽  
New Approach ◽  
Dissipation Of Energy

A new approach to calculation of the dissipation of mechanical energy in the environment with turbulent viscosity based on determination of the shear modulus of velocity is proposed. As an example the dynamics of Hill vortex moved in such environment is considered. The vortex radius extends linearly with the distance covered and makes up about 13% from it.

An experimental method for the investigation of rigid polyurethane foams in shear

2018 ◽  
Vol 54 (5) ◽  
pp. 851-884
Author(s):  
Ilze Beverte
Keyword(s):  
Shear Modulus ◽  
Polyurethane Foams ◽  
Shear Displacement ◽  
Test Material ◽  
Experimental Investigations ◽  
Plastic Foams ◽  
Tension Tests ◽  
Different Dimensions ◽  
Porous Plastic

Widespread applications of rigid polyurethane and plastic foams lead to shear deformations. Therefore, methods for ensuring shear using experimental investigations are necessary, including the possibility of determining the shear modulus, strength and limit angle. Therefore, a device that allows investigating the shear properties of highly porous plastic foams was developed. The proposed device comprises a clip-on extensometer, commonly exploited in uni-axial compression/tension tests, for the determination of the shear displacement directly on the foams’ sample, on a measurement zone of certain dimensions and location. An innovative construction of the extensometer’s legs is elaborated, permitting to investigate the shear displacement field for different dimensions of the measurement zone. Precision of the device is examined by performing a penetration test on materials of different densities: (a) polyurethane foams and (b) wood. Technology for the production of isotropic polyurethane foams as a test material is described in detail. Experimental determination of shear modulus and strength of one and the same sample, in one and the same experiment is elaborated. Displacements in different zones of sample’s work beam are investigated. Experimental data are compared with the results of mathematical modelling and a good correlation is proved to exist.

The Elastic Coefficients of the Theory of Consolidation

1957 ◽  
Vol 24 (4) ◽  
pp. 594-601
Author(s):  
M. A. Biot ◽  
D. G. Willis
Keyword(s):  
Nonlinear Systems ◽  
Shear Modulus ◽  
Physical Interpretation ◽  
Compressible Fluid ◽  
Elastic Solid ◽  
Fluid Content ◽  
Alternate Forms ◽  
Elastic Coefficients ◽  
Methods Of Measurement

Abstract The theory of the deformation of a porous elastic solid containing a compressible fluid has been established by Biot. In this paper, methods of measurement are described for the determination of the elastic coefficients of the theory. The physical interpretation of the coefficients in various alternate forms is also discussed. Any combination of measurements which is sufficient to fix the properties of the system may be used to determine the coefficients. For an isotropic system, in which there are four coefficients, the four measurements of shear modulus, jacketed and unjacketed compressibility, and coefficient of fluid content, together with a measurement of porosity appear to be the most convenient. The porosity is not required if the variables and coefficients are expressed in the proper way. The coefficient of fluid content is a measure of the volume of fluid entering the pores of a solid sample during an unjacketed compressibility test. The stress-strain relations may be expressed in terms of the stresses and strains produced during the various measurements, to give four expressions relating the measured coefficients to the original coefficients of the consolidation theory. The same method is easily extended to cases of anisotropy. The theory is directly applicable to linear systems but also may be applied to incremental variations in nonlinear systems provided the stresses are defined properly.

scholarly journals SANDWICH PANELS – BEHAVIOR IN FIRE BASED ON FIRE RESISTANCE TESTS

2016 ◽  
Author(s):  
Paweł Roszkowski ◽  
Paweł Sulik
Keyword(s):  
Thermal Insulation ◽  
Fire Resistance ◽  
Temperature Rise ◽  
Sandwich Panel ◽  
Sandwich Panels ◽  
And Behavior ◽  
In Fire ◽  
Resistance Tests ◽  
Building Elements

<p>Sandwich panel is the material that is easy and quickly to install. Basing on a great experience in the area of determination of the fire resistance class of construction building elements the authors describe the properties and behavior of building elements made of the sandwich panels exposed to fire. The article presents the results of fire resistance tests carried out in accordance with EN 1364-1 non-bearing walls made of sandwich panels with use of different cores.</p>The following parameters were analyzed: temperature rise on unexposed side (I – thermal insulation), integrity (E) depending on the orientations and on the width of the sandwich panels, deflection depending on the thickness of the boards. Conclusions were made on the base of the analysis from fire resistance tests.

Effect of Cell Geometry on the Shear Modulus and on Density of Sandwich Panel Cores

1961 ◽  
Vol 83 (4) ◽  
pp. 513-517 ◽  
Author(s):  
Chieh C. Chang ◽  
Ibrahim K. Ebcioglu
Keyword(s):  
Aspect Ratio ◽  
Shear Modulus ◽  
Sandwich Panel ◽  
Analytic Theory ◽  
Cell Geometry ◽  
Cell Weight ◽  
The Core ◽  
Special Cases ◽  
Square Cells ◽  
Sandwich Core

A simple analytic theory for the effect of cell geometry on both the shear modulus and the density of sandwich panel core is presented. The core shear modulus in different directions is analyzed to include the effects of the angle α and the aspect ratio b/a of the cell. It is also found that the minimum cell weight of the sandwich core depends both on the cell angle α and the cell aspect ratio b/a. The theory compares fairly well with some available experiments. The cell geometry chosen is so general that the regular hexagonal and square cells of commercial sandwich cores are special cases.

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