scholarly journals An approach to modeling the relationship between ultrasonic propagation properties and constituent properties of mammalian tissues

1979 ◽  
Vol 65 (S1) ◽  
pp. S3-S4 ◽  
Author(s):  
J. D. Pohlhammer ◽  
W. D. O'Brien
Keyword(s):  
Mammalian Tissues ◽  
Ultrasonic Propagation ◽  
Propagation Properties ◽  
The Relationship

ULTRASONIC PROPAGATION IN SOLENHOFEN LIMESTONE AT HIGH PRESSURES

Geophysics ◽  
1978 ◽  
Vol 43 (5) ◽  
pp. 1014-1017
Author(s):  
I. J. Fritz
Keyword(s):  
High Pressure ◽  
Wave Propagation ◽  
Phase Transitions ◽  
Seismic Waves ◽  
High Pressures ◽  
Sound Propagation ◽  
Wave Measurements ◽  
Ultrasonic Propagation ◽  
Propagation Properties ◽  
The Relationship

The measurement of ultrasonic velocities at high pressure in minerals and rocks provides information pertinent to a variety of geophysical and engineering problems such as those of determining the state of matter in the earth's interior, understanding the propagation of seismic waves, and characterizing mechanical behavior of materials that are important in mining technology. In recent years there have been a number of reported high pressure sound velocity measurements in various kinds of limestone. (A concise review of this work can be found in a recent paper by Singh and Kennedy, 1974.) Such measurements continue to be of interest because of the relationship to shock‐wave propagation properties (Grady et al, 1977). From the previous measurements it has been found that the phase transitions in calcite, which is the main constituent of limestone, strongly influence the sound velocities. The phase transitions in pure calcite occur at 14.5 kbar (calcite I–II) and 17.4 kbar (calcite II–III) (Singh and Kennedy, 1974); however, because the transitions may be shifted in pressure and spread out over a range of pressures in a rock, it is necessary to make measurements to pressures in excess of 20 kbar in order to characterize the effects of the transitions. To date there has been only one experimental study of the effect of the II–III transition on sound propagation, namely the longitudinal wave measurements in Oak Hall limestone made by Wang and Meltzer (1973). In order to further characterize the effect of the II–III transition on sound propagation in limestone, we have made measurements to 25 kbar on Solenhofen limestone. We were able to measure both longitudinal and transverse velocities over the full pressure range; thus, our measurements represent the first study of the effect of the II–III transition on shear wave propagation under conditions of hydro static pressure.

Study on the Relationship of Hydrogen Content and Ultrasonic Propagation Properties

2007 ◽  
Vol 353-358 ◽  
pp. 2549-2552
Author(s):  
Lei Zhang ◽  
Shi Hua Tang ◽  
Hong Liang Pan
Keyword(s):  
Hydrogen Content ◽  
Petrochemical Industry ◽  
Hydrogen Attack ◽  
Hydrogen Corrosion ◽  
Metal Materials ◽  
Material Conditions ◽  
Ultrasonic Propagation ◽  
Propagation Properties ◽  
Relationship Of ◽  
The Relationship

Hydrogen-induced corrosion is a common damage in petrochemical industry. It can rise crack and bubbling on the surface of metal materials when the hydrogen corrosion is in the stage of severity. In the present, it is hard to evaluate the material conditions nondestructively under hydrogen attack. In this paper, the possibility of the relationship between ultrasonic propagation properties and the content of hydrogen corrosion was investigated. We have found that the surface wave velocity is a parameter, which can be directly correlated with the hydrogen content. The sensitivity has been found to be acceptable.

Metal Surface Fatigue Detection Using Nonlinear Ultrasonic

2014 ◽  
Vol 510 ◽  
pp. 156-162 ◽  
Author(s):  
Hong Juan Yan ◽  
Chun Guang Xu ◽  
Qi Lin ◽  
Hai Chao Cai
Keyword(s):  
Fatigue Life ◽  
Nonlinear Coefficient ◽  
304 Stainless Steel ◽  
2024 Aluminum Alloy ◽  
Surface Fatigue ◽  
Micro Cracks ◽  
Nonlinear Ultrasonic ◽  
Ultrasonic Propagation ◽  
Fatigue Detection ◽  
The Relationship

Based on theory of ultrasonic nondestructive testing on surface fatigue damage of metal components, the wave law of ultrasonic nonlinearity caused by fatigue is studied. When there are lattice defects in metal material, second-order nonlinear coefficient β changes during ultrasonic propagation. According to the point, the system of nonlinear ultrasonic testing is build. The change trends of harmonic amplitudes and ultrasonic coefficients are measured during fatigue bending testing of materials such as 45 steel, 2024 aluminum alloy and 304 stainless steel. The results shows: in elastic phase, the ratios of harmonic and fundamental waves monotonically increase with fatigue life, and in plastic phase, deformations appear and micro-cracks expand into macro-cracks in materials, the ratios firstly decrease and then increase with fatigue life. However the quadratic sums of nonlinear coefficient are approximately linear with the fatigue life. Therefore, when the relationship between the quadratic sums and fatigue life is known, it can be used to characterize fatigue state of metal materials.

1113 Ultrasonic propagation properties of a magnetic fluid under high pressure

2012 ◽  
Vol 2012 (0) ◽  
pp. 433-434
Author(s):  
Yasuhiro Fujita ◽  
Ahmad Isnikurniawan ◽  
Sachio Tanimoto ◽  
Tatsuo Sawada
Keyword(s):  
High Pressure ◽  
Magnetic Fluid ◽  
Ultrasonic Propagation ◽  
Propagation Properties

908 Ultrasonic propagation properties through metallic plate of hybrid type ultrasonic flowmeter(2)

2007 ◽  
Vol 2007 (0) ◽  
pp. _908-1_-_908-4_
Author(s):  
Sho HAMADA ◽  
Kensuke USUI ◽  
Hiroshige KIKURA ◽  
Masanori ARITOMI ◽  
Michitsugu MORI
Keyword(s):  
Ultrasonic Flowmeter ◽  
Metallic Plate ◽  
Hybrid Type ◽  
Ultrasonic Propagation ◽  
Propagation Properties
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