RECENT TECHNIQUES FOR DETERMINATION OF “IN‐SITU” ELASTIC PROPERTIES AND MEASUREMENT OF MOTION AMPLIFICATION IN LAYERED MEDIA

Geophysics ◽  
1962 ◽  
Vol 27 (2) ◽  
pp. 237-241 ◽  
Author(s):  
R. J. Swain
Keyword(s):  
Engineering Design ◽  
Elastic Properties ◽  
Elastic Constants ◽  
Layered Media ◽  
Dynamic Loads ◽  
Safety Factors

Determination of the elastic properties of earth materials by laboratory means is subject to sizable errors. These errors may be serious in spite of the large safety factors normally used in engineering design, particularly if the structure must withstand severe dynamic loads. Means of obtaining elastic constants “in‐situ” are described. Further, the phenomenon of displacement multiplication between the underlying competent rock and overlying alluvium or fill is reviewed and the first instrumentation system designed specifically to measure this relationship for engineering purposes is described.

On: “RECENT TECHNIQUES FOR DETERMINATION OF IN SITU ELASTIC PROPERTIES AND MEASUREMENT OF MOTION AMPLIFICATION IN LAYERED MEDIA,” BY R.J. SWAIN (GEOPHYSICS, APRIL, 1962, PP. 237–241).

Geophysics ◽  
1963 ◽  
Vol 28 (1) ◽  
pp. 112-112 ◽  
Author(s):  
Harry R. Nicholls
Keyword(s):  
Elastic Properties ◽  
Elastic Constants ◽  
Design Problem ◽  
Critical Angle ◽  
Specific Design ◽  
Design Problems ◽  
Relative Value ◽  
Angle Method

Although I am in general agreement with Mr. Swain’s paper, there are several pitfalls inherent in the use of dynamic elastic constants which should not be ignored. The strength of materials and the elastic properties both undoubtedly depend on the rate of loading and/or the stress levels involved. It does not seem appropriate, therefore, to use dynamic in situ elastic properties for static design problems. The specific design problem at hand should determine the relative value placed on the use of static or dynamic elastic constants. The dynamic in situ values are generally more reliable than those obtained in the laboratory as indicated by Mr. Swain, although continued development of the laboratory pulse and critical‐angle method shows promise of improving the reliability of laboratory values.

On: “RECENT TECHNIQUES FOR DETERMINATION OF IN SITU ELASTIC PROPERTIES AND MEASUREMENT OF MOTION AMPLIFICATION IN LAYERED MEDIA,” BY R. J. SWAIN (GEOPHYSICS, APRIL, 1962, PP. 237–241).

Geophysics ◽  
1963 ◽  
Vol 28 (1) ◽  
pp. 112-113 ◽  
Author(s):  
Tsvi Meidav
Keyword(s):  
Elastic Properties ◽  
Seismic Wave ◽  
Elastic Moduli ◽  
Layered Media ◽  
Small Error ◽  
Elastic Parameters ◽  
Dynamic Elastic Properties

Swain points out that seismic techniques have been used for determination of elastic parameters in unconsolidated materials as well as in consolidated ones. It must be pointed out that relationships between elastic moduli and longitudinal and shear velocities are not entirely valid for soil or other unconsolidated matter, as those are not truly elastic. An exception to this statement may be made with a small error when it is desirable to determine the dynamic elastic properties of the material at the frequency of the seismic wave. Such a determination might be useful in testing a foundation for a vibrating machinery or a runway.

Determination of in-situ elastic properties and reservoir boundary conditions

2020 ◽  
Vol 81 ◽  
pp. 103397
Author(s):  
Saeed Rafieepour ◽  
Silvio Baldino ◽  
Stefan Z. Miska
Keyword(s):  
Boundary Conditions ◽  
Elastic Properties

scholarly journals Determination of polycrystal diffraction elastic constants of Ti–2.5Cu by using in situ tensile loading and synchrotron radiation

2014 ◽  
Vol 594 ◽  
pp. 62-67 ◽  
Author(s):  
E. Maawad ◽  
H.-G. Brokmeier ◽  
Z.Y. Zhong ◽  
N. Al-Hamdany ◽  
M. Salih ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Elastic Constants ◽  
Tensile Loading

scholarly journals Determination of the high temperature elastic properties and diffraction elastic constants of Ni-base superalloys

2016 ◽  
Vol 89 ◽  
pp. 856-863 ◽  
Author(s):  
P.E. Aba-Perea ◽  
T. Pirling ◽  
P.J. Withers ◽  
J. Kelleher ◽  
S. Kabra ◽  
...  
Keyword(s):  
High Temperature ◽  
Elastic Properties ◽  
Elastic Constants

scholarly journals Influence of Ply Sequence on the Elastic Properties of Laminated Composites

2009 ◽  
Vol 18 (5) ◽  
pp. 096369350901800
Author(s):  
A.M. Amaro ◽  
F.V. Antunes ◽  
A. Ramalho
Keyword(s):  
Elastic Properties ◽  
Material Parameter ◽  
Laminated Composites ◽  
Epoxy Composites ◽  
Dynamic Loads ◽  
Stacking Sequence ◽  
Specific Strength ◽  
Stiffness Properties ◽  
Strength And Stiffness

Composite materials are mostly submitted to dynamic loads, because of their excellent specific strength and stiffness, therefore the resonant technique is adequate for the determination of stiffness properties. Three plates of similar carbon-epoxy composites with distinct fibre orientations were studied with this technique. The effect of stacking sequence on the rigidity of laminated composites was investigated A significant influence of this material parameter on in-plane elastic properties was found, allowing optimization of stiffness for a particular application.

Automated determination of n-cyanobiphenyl and n-cyanobiphenyl binary mixtures elastic constants in the nematic phase from molecular simulation

2020 ◽  
Vol 5 (6) ◽  
pp. 1131-1136
Author(s):  
Jiale Shi ◽  
Hythem Sidky ◽  
Jonathan K. Whitmer
Keyword(s):  
Liquid Crystals ◽  
Molecular Simulation ◽  
Elastic Properties ◽  
Binary Mixtures ◽  
Elastic Constants ◽  
Nematic Phase ◽  
New Techniques ◽  
New Applications ◽  
Automated Determination

This work explores new techniques in molecular simulation which can be used to precisely determine and engineer elastic properties of liquid crystals for new applications.

Determination of Elastic Constants for Human Femurs

1979 ◽  
Vol 101 (3) ◽  
pp. 193-197 ◽  
Author(s):  
V. G. Lappi ◽  
M. S. King ◽  
I. Le May
Keyword(s):  
Elastic Properties ◽  
Elastic Constants ◽  
Isotropic Material ◽  
Rotational Symmetry ◽  
Transversely Isotropic ◽  
Longitudinal Axis ◽  
Transversely Isotropic Material ◽  
Axis Of Symmetry ◽  
Plane Of Isotropy

The elastic properties of the bone constituting human femurs have been determined from measurements of the velocities of ultrasonic compressional and shear waves through wet, embalmed bone samples. The bone has been shown to be a transversely isotropic material with the axis of symmetry parallel to the longitudinal axis of the bone. The values of the elastic constants were determined to be: c11=6860±330MPaE3=5500MPac12=2700±570MPaE1=4990MPac13=3760±1570MPaν31=0.39c33=8480±760MPaν12=0.20c44=2240±180MPaG31=2240MPa where the 3-axis is that of rotational symmetry and the 1- and 2-axes are in the plane of isotropy.

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