Ultrasonic determination of the elastic and shear modulus on aged wood

2019 ◽  
Author(s):  
Mayra Carrillo ◽  
Hector G. Carreon
Keyword(s):  
Shear Modulus ◽  
Ultrasonic Determination

Ultrasonic Determination of Liver and Spleen Volumes

1971 ◽  
Vol 27 (2) ◽  
pp. 123-128 ◽  
Author(s):  
T. Kardel ◽  
H. H. Holm ◽  
S. Norby Rasmussen ◽  
T. Mortensen
Keyword(s):  
Ultrasonic Determination

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.

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