scholarly journals Characterization of Micrometric and Localised Residual Stresses on Amorphous Materials Using Dispersion of Surface Acoustic Waves

2014 ◽  
Vol 996 ◽  
pp. 392-397 ◽  
Author(s):  
Marc Duquennoy ◽  
Mohammadi Ouaftouh ◽  
Julien Deboucq ◽  
Jean Etienne Lefebvre ◽  
Frederic Jenot ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Acoustic Waves ◽  
Inverse Method ◽  
Amorphous Materials ◽  
Surface Acoustic Waves ◽  
Potassium Nitrate ◽  
Ultrasonic Waves ◽  
Surface Reinforcement ◽  
Compression Layer

For amorphous materials such as glass, the fragility of the material can be limited using surface reinforcement by chemical tempering. The principle of chemical tempering consists in forming a superficial compression layer on the surface by immersing the glass in a solution of molten potassium nitrate. In this study, dispersion of surface ultrasonic waves caused by the presence of residual surface stresses was studied. The thickness and the level of the stressed cortical zones were estimated using an inverse method.

Characterization of micrometric and superficial residual stresses using high frequency surface acoustic waves generated by interdigital transducers

2013 ◽  
Vol 134 (6) ◽  
pp. 4360-4371 ◽  
Author(s):  
Marc Duquennoy ◽  
Mohammadi Ouaftouh ◽  
Julien Deboucq ◽  
Jean-Etienne Lefebvre ◽  
Frederic Jenot ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Acoustic Waves ◽  
High Frequency ◽  
Surface Acoustic Waves

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

scholarly journals Highly Sensitive Surface Acoustic Wave Magnetic Field Sensor Using Multilayered TbCo2/FeCo Thin Film

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 902 ◽  
Author(s):  
Aurelien Mazzamurro ◽  
Abdelkrim Talbi ◽  
Yannick Dusch ◽  
Omar Elmazria ◽  
Philippe Pernod ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Magnetic Field Sensor ◽  
Nanostructured Thin Film ◽  
Highly Sensitive ◽  
Magnetic Model ◽  
Field Sensor

Over the last decades, the use of Surface Acoustic Waves (SAW) has emerged as a promising technology in many applications such as filters, signal processing but also sensors. We report the fabrication and the characterization of a SAW delay line magnetic field sensor using uniaxial multi-layered 14×[TbCo2(3.7nm)/FeCo(4nm)] nanostructured thin film deposited on Y36° Lithium Niobate (Figure 1a). The sensor shows an interesting dependency to a tunable bias magnetic field with different orientations relative to the easy axis. The obtained results are well explained using an equivalent piezo-magnetic model described in a previous work.

Surface Wave Propagation in Thin Silver Films under Residual Stress

2002 ◽  
Vol 57 (1-2) ◽  
pp. 58-64
Author(s):  
A. Njeh ◽  
D. Schneider ◽  
H. Fuess ◽  
M. H. Ben Ghozlen
Keyword(s):  
Residual Stresses ◽  
Phase Velocity ◽  
Surface Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Dispersion Curves ◽  
Silver Films ◽  
Surface Wave Propagation ◽  
Relative Change ◽  
Good Agreement

Investigations using surface acoustic waves provide information on the elastic properties of thin films. Residual stresses change the phase velocity of the surface waves. We have calculated the phase velocity and dispersion of surface waves in thin silver films with a strong [111]-fibre texture. A non-linear description of surface waves propagating along the [110]-direction of the substrate has been developed on the basis of an acoustoelastic theory, taking into account residual stresses. The relative change Δc/c of the velocity v was found to be linear for large excitation frequencies. The dispersion curves were measured using a photoacoustic method. For sputtered polycrystalline thin silver films we found good agreement between the experimental and calculated dispersion curves for frequencies up to 225 MHz

scholarly journals Using Welding Simulation and Ultrasonic Method to Evaluate Residual Stress in Stainless Steel Welded Plates

2012 ◽  
Author(s):  
Yashar Javadi ◽  
Mohammadreza Hadizadeh Raeisi ◽  
Hamed Salimi Pirzaman ◽  
Mehdi Ahmadi Najafabadi
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Residual Stresses ◽  
Acoustic Waves ◽  
Stress Measurement ◽  
Bulk Material ◽  
Three Dimensional ◽  
Ultrasonic Waves ◽  
Welding Simulation

When a material is under mechanical load, the stresses change the velocity of acoustic waves because of acoustoelastic effect. This property can be employed for stress measurement in the material itself when the stress concerns the surface of the material, or in the bulk material. This technique involves with critically refracted longitudinal waves that propagate parallel to the surface, i. e. LCR waves. This paper presents a three dimensional thermo-mechanical analysis to evaluate welding residual stresses in plate-plate joint of AISI stainless steel 304L. After finite element simulation, the residual stresses were evaluated by LCR ultrasonic waves. This paper introduces a combination of “Finite Element Welding Simulation” and “Ultrasonic Stress Measurement using the LCR Wave” which is called as “FELcr”. The capabilities of FELCR in residual stress measurement are confirmed here. It has been shown that predicted residual stress from three dimensional FE analyses is in reasonable agreement with measured residual stress from LCR method.

Characterization of EUV induced carbon films using laser-generated surface acoustic waves

2009 ◽  
Vol 18 (5-8) ◽  
pp. 768-771 ◽  
Author(s):  
Juequan Chen ◽  
Chris J. Lee ◽  
Eric Louis ◽  
Fred Bijkerk ◽  
Reinhard Kunze ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Carbon Films
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