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.

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.

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 Dynamic Elastic Properties of Powder Metallurgy Components

1993 ◽  
pp. 1631-1638 ◽  
Author(s):  
S. Parthasarathi ◽  
T. Prucher ◽  
C. J. Yu ◽  
J. Jo ◽  
R. J. Henry
Keyword(s):  
Powder Metallurgy ◽  
Elastic Properties ◽  
Dynamic Elastic Properties

Determination of the static and dynamic elastic properties of resilient materials

1954 ◽  
Vol 101 (83) ◽  
pp. 512-521
Author(s):  
R.S. Jackson ◽  
A.J. King ◽  
C.R. Maguire
Keyword(s):  
Elastic Properties ◽  
Dynamic Elastic Properties

Elastic Properties of Solid Solutions with Intermediate Valence Sm1-xYxS

2015 ◽  
Vol 770 ◽  
pp. 137-143
Author(s):  
E.G. Soboleva ◽  
A.L. Igisheva ◽  
T.B. Krit
Keyword(s):  
Elasticity Theory ◽  
Elastic Properties ◽  
Solid Solutions ◽  
Elastic Moduli ◽  
Intermediate Valence ◽  
Elastic Parameters ◽  
Valence Transition ◽  
The Given ◽  
Poisson's Ratios ◽  
Poisson’S Ratios

The given article considers acoustic analogues of elasticity theory ratios determining Poisson’s ratios of Sm1-xYxS alloy by their elastic parameters. The article discusses behavior of sound velocities, elastic moduli, Poisson’s ratios, Grüneisen parameter and brittleness-plasticity criterion ratios depending on the concentration of alloy components including valence transition from semiconductors into the metal phase.

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