scholarly journals Property Evaluation of Vapor-Deposited TiN Film by the Analysis of Elastic Waves. (1st Report, Nondestructive Evaluation of Elastic Properties by Laser Surface Acoustic Waves.)

1998 ◽  
Vol 41 (3) ◽  
pp. 439-445 ◽  
Author(s):  
Hideo CHO ◽  
Singo OGAWA ◽  
Kazushi YAMANAKA ◽  
Mikio TAKEMOTO
Keyword(s):  
Nondestructive Evaluation ◽  
Elastic Properties ◽  
Elastic Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Laser Surface ◽  
Tin Film ◽  
Property Evaluation

Measurement of the elastic properties of evaporated C60 films by surface acoustic waves

1994 ◽  
Vol 59 (1) ◽  
pp. 83-86 ◽  
Author(s):  
H. Coufal ◽  
K. Meyer ◽  
R. K. Grygier ◽  
M. Vries ◽  
D. Jenrich ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
C60 Films

scholarly journals Nondestructive Evaluation of Thermal Aging in Al6061 Alloy by Measuring Acoustic Nonlinearity of Laser-Generated Surface Acoustic Waves

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 38 ◽  
Author(s):  
Jihyun Jun ◽  
Hogeon Seo ◽  
Kyung-Young Jhang
Keyword(s):  
Mechanical Properties ◽  
Nondestructive Evaluation ◽  
Thermal Aging ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Tensile Tests ◽  
Acoustic Nonlinearity ◽  
Transmission Electron ◽  
Heat Treated ◽  
Elongation To Failure

The structures in high-temperature environments are prone to undergo hardening and embrittlement as a result of thermal aging; this can cause variations in their mechanical properties. Because these changes occur at the microstructural level, it is difficult to evaluate them through linear ultrasonic techniques. In this work, a surface acoustic wave (SAW) was used to measure and compare the acoustic nonlinearity and mechanical properties of Al6061 alloys heat-treated at 220 °C for different durations (0 min, 20 min, 40 min, 1 h, 2 h, 10 h, 100 h, 1000 h). The SAW was generated by a pulsed laser and then received by an interferometer. Moreover, the yield strength, ultimate strength, and elongation to failure were measured by tensile tests. The results demonstrate that the critical variations in the mechanical properties can be detected by monitoring the variation features in the acoustic nonlinearity. Transmission electron microscopy images were captured to observe the microstructural changes, which shows that the acoustic nonlinearity varied according to the change in the precipitation phase. This supports the acoustic nonlinearity measurement using the laser-generated SAW being an effective technique for the fully noncontact nondestructive evaluation of material degradations as well as changes in mechanical properties.

Elastic properties of boron carbide films via surface acoustic waves measured by Brillouin light scattering

2012 ◽  
Vol 210 (3) ◽  
pp. 513-518 ◽  
Author(s):  
E. Salas ◽  
F. Jiménez-Villacorta ◽  
J. Sánchez-Marcos ◽  
R. J. Jiménez Riobóo ◽  
A. Muñoz-Martín ◽  
...  
Keyword(s):  
Light Scattering ◽  
Boron Carbide ◽  
Elastic Properties ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Brillouin Light Scattering

Two-Axis Solid-State Microgyroscope on Surface Acoustic Waves

2019 ◽  
Vol 20 (5) ◽  
pp. 299-307
Author(s):  
V. P. Sizov ◽  
V. N. Pogorelov ◽  
Yu. V. Vakhtin
Keyword(s):  
Solid State ◽  
Elastic Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Oscillation Amplitude ◽  
Substrate Layer ◽  
Production Technologies ◽  
Wave Models ◽  
And Control ◽  
High Degree

This article focuses on the development of a two-axis solid state micro gyroscope (SMG) on surface acoustic waves (SAW). The described gyroscope belongs to the category of inexpensive sensing elements featuring a high degree of longtime overload stability. This advantage seems to make SAW SMGs a priority choice for navigation and control systems functioning in severe overload environments of up to 65,000 g. As of today SAW SMGs are designed according to a number of known principles. Such SMGs may also operate on standing SAWs or traveling SAWs. This article addresses the first gyro type. Unfortunately, the existing standing SAW SMGs share a common limitation of measuring angular rates in relation to one axis only. This research attempts to introduce an innovative two-axis standing SAW SMG. The influence of the basis rotation on the parameters of the elastic waves traveling within the substrate layer was carefully studied. Incident and reflected wave models were also elaborated. The numerical simulation results demonstrate the effects of the basis rotation on the complex factors of the volume waves reflected by the substrate layer and on the phase velocity and frequency thereof as well as on the oscillation amplitude of the particles involved in SAW transition, and on the elliptical particle movement path configuration. Also, the SAW SMG is compared to the existing micromechanical gyroscopes, and the basic SAW SMG production technologies are reviewed.

Measurement of elastic properties of GaAs with laser‐generated surface acoustic waves

1999 ◽  
Vol 105 (2) ◽  
pp. 1229-1229 ◽  
Author(s):  
C. M. Flannery ◽  
E. Chilla ◽  
H.‐J. Fröhlich
Keyword(s):  
Elastic Properties ◽  
Acoustic Waves ◽  
Surface Acoustic Waves
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