scholarly journals Technical Report on the Status of Nonlinear Ultrasonic Techniques for Non-Destructive Inspection

2014 ◽  
Author(s):  
Brian Anderson ◽  
Marcel Remillieux ◽  
Sylvain Haupert ◽  
Yoshikazu Ohara ◽  
Colton Lake ◽  
...  
Keyword(s):  
Technical Report ◽  
Nonlinear Ultrasonic ◽  
The Status ◽  
Ultrasonic Techniques ◽  
Non Destructive

scholarly journals Nonlinear Ultrasonic Guided Wave Method Using Semi-Analytical Finite Element (SAFE) Technique on a Damaged SWO-V Spring Coil

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 752
Author(s):  
Jeongnam Kim ◽  
Junpil Park ◽  
Bo Zhu ◽  
Younho Cho
Keyword(s):  
Finite Element ◽  
Shot Peening ◽  
Guided Wave ◽  
Phase Matching ◽  
Linear Elastic ◽  
Ultrasonic Guided Wave ◽  
Nonlinear Ultrasonic ◽  
Safe Technique ◽  
Ultrasonic Techniques ◽  
Non Destructive

This work presents a non-destructive method for quantitative essessment of fatigue damage of materials with linear elastic properties using nonlinear ultrasonic techniques. A nonlinear study was conducted on these materials with fatigue and shot peening processing using a nonlinear ultrasonic technique. A numerical method based on the semi-analytical finite element (SAFE) technique, was used to obtain the phase-matching modes of the specimens. Experiments confirm that the nonlinearity for shot peening and samples with a certain level of fatigue shows a tendency to increase with levels of fatigue.

scholarly journals Possibilities of using scanning acoustic microscopy to analyze incompatibilities in braze welded joints

2019 ◽  
Vol 91 (10) ◽  
pp. 7-15
Author(s):  
Tomasz Piwowarczyk ◽  
Marcin Korzeniowski ◽  
Dawid Majewski
Keyword(s):  
Aluminum Alloys ◽  
Welded Joints ◽  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
Ultrasonic Techniques ◽  
Titanium Grade ◽  
Non Destructive

This article explores the possibilities of using non-destructive ultrasonic techniques to analyze the quality of lapped braze-welded joints. The tests were performed for 4 material groups (DC03+ZE steel and X5CrNi18-19 steel, aluminum alloys AW-5754 and AW-6061, titanium Grade 2 and copper Cu-ETP). As part of the work, additional materials and joint processes and its parameters were selected (TIG, MIG, laser). The quality of joints was monitored using scanning acoustic microscopy. Based on the A-scan andC-scan images, potential joints imperfections were determined. The possibilities of using advanced ultrasonic techniques to analyze the quality of braze joints was assessed.

scholarly journals Monitoring of Thermal Aging of Aluminum Alloy via Nonlinear Propagation of Acoustic Pulses Generated and Detected by Lasers

2019 ◽  
Vol 9 (6) ◽  
pp. 1191 ◽  
Author(s):  
Mengmeng Li ◽  
Alexey Lomonosov ◽  
Zhonghua Shen ◽  
Hogeon Seo ◽  
Kyung-Young Jhang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Yield Strength ◽  
Thermal Aging ◽  
Finite Amplitude ◽  
Quadratic Nonlinearity ◽  
Laser Ultrasonic ◽  
Ultrasonic Techniques ◽  
Non Destructive

Nonlinear acoustic techniques are established tools for the characterization of micro-inhomogeneous materials with higher sensitivity, compared to linear ultrasonic techniques. In particular, the evaluation of material elastic quadratic nonlinearity via the detection of the second harmonic generation by acoustic waves is known to provide an assessment of the state variation of heat treated micro-structured materials. We report on the first application for non-destructive diagnostics of material thermal aging of finite-amplitude longitudinal acoustic pulses generated and detected by lasers. Finite-amplitude longitudinal pulses were launched in aluminum alloy samples by deposited liquid-suspended carbon particles layer irradiated by a nanosecond laser source. An out-of-plane displacement at the epicenter of the opposite sample surface was measured by an interferometer. This laser ultrasonic technique provided an opportunity to study the propagation in aluminum alloys of finite-amplitude acoustic pulses with a strain up to 5 × 10−3. The experiments revealed a signature of the hysteretic quadratic nonlinearity of micro-structured material manifested in an increase of the duration of detected acoustic pulses with an increase of their amplitude. The parameter of the hysteretic quadratic nonlinearity of the aluminum alloy (Al6061) was found to be of the order of 100 and to exhibit more than 50% variations in the process of the alloy thermal aging. By comparing the measured parameter of the hysteretic quadratic nonlinearity in aluminum alloys that were subjected to heat-treatment at 220 °C for different times (0 min, 20 min, 40 min, 1 h, 2 h, 10 h, 100 h, and 1000 h), with measurements of yield strength in same samples, it was established that the extrema in the dependence of the hysteretic nonlinearity and of the yield strength of this alloy on heat treatment time are correlated. This experimental observation provides the background for future research with the application goal of suggested nonlinear laser ultrasonic techniques for non-destructive evaluation of alloys’ strength and rigidity in the process of their heat treatment.

Characterization of Elastomers and Elastomeric Composites Using Ultrasound

2002 ◽  
Vol 733 ◽  
Author(s):  
Subash Jayaraman ◽  
Jonathan Dick ◽  
Timothy Craychee ◽  
Jikai Du ◽  
Bernhard Tittmann
Keyword(s):  
Wave Amplitude ◽  
Contact Method ◽  
Wave Velocities ◽  
Ultrasonic Techniques ◽  
Second Wave ◽  
Non Destructive ◽  
Sample Set ◽  
Elastomeric Composites ◽  
Polymer Type

AbstractThe knowledge of elastic properties of the various types of rubber is significant for many commercial and academic applications. A sample set consisting of generic elastomeric compounds was studied using non-destructive non-contact ultrasonic techniques. The longitudinal sound wave velocities in the sample and wave amplitude attenuation in the sample were measured using the Second Wave Inc. Non-Contact Analyzer 1000 (NCA1000). The Contact method was then used to corroborate the results obtained. A rule-of-mixture model was used to compare the velocity values obtained by the non-contact technique. The preliminary results suggest that the differences in attenuation are driven by polymer type and also to a lesser extent by the loading level of carbon black fillers.

Nonlinear Ultrasonic Method to Detect Micro-Delamination in Electronic Packaging

2005 ◽  
Vol 297-300 ◽  
pp. 813-818 ◽  
Author(s):  
Job Ha ◽  
Kyung Young Jhang
Keyword(s):  
Electronic Packaging ◽  
Ultrasonic Method ◽  
Frequency Component ◽  
Nonlinear Parameter ◽  
Crack Face ◽  
Test Tool ◽  
Nonlinear Ultrasonic ◽  
Parameter Dependent ◽  
Non Destructive ◽  
Nonlinear Ultrasonic Method

The linear ultrasonic technique has been extensively used as a powerful, non-destructive test tool for reliability testing and failure analysis of electronic packaging. This is used most often in the inspection of defects such as delaminations, voids, or cracks through use of a SAM (Scanning Acoustic Microscope). Then, as the reliability level that is required of electronic packaging becomes higher and the thickness of package becomes thinner, the possible defect which needs to be detected becomes smaller. In the conventional SAM, however it is very difficult to detect small defects less than m µ 1 . 0 , such as micro-delaminations. In order to solve such a problem, this paper proposes a nonlinear ultrasonic method, where the nonlinearity caused by the effect of crack-face interactions is considered. The basic concept of this method involves harmonic frequencies that are generated in the transmitted ultrasonic wave due to the partial contact at the interface of micro-delamination. As an evaluation index, the nonlinear parameter dependent on the amplitude of the second order harmonic frequency component is obtained by spectral analysis of the transmitted signal. Experimental results show that the nonlinear parameter has good correlation with the micro-gap and the proposed method can detect the micro-delamination even less than nm 1 .

Review: Low intensity ultrasonics in food technology / Revisión: Ultrasonidos de baja intensidad en tecnología de alimentos

1999 ◽  
Vol 5 (4) ◽  
pp. 285-297 ◽  
Author(s):  
A. Mulet ◽  
J. Benedito ◽  
J. Bon ◽  
N. Sanjuan
Keyword(s):  
Chemical Properties ◽  
Food Technology ◽  
Basic Principles ◽  
Low Intensity ◽  
Ultrasonic Techniques ◽  
Quality Of Food ◽  
Ultrasonic Parameters ◽  
Physical And Chemical ◽  
Non Destructive

Ultrasonic applications can be classified into low intensity or high intensity applications. The latter are used to modify a process or product with ultrasonics, while in low intensity applications the process or product modifies the ultrasonic signal, thus providing information about the product. Low inten sity ultrasonics in food technology can be used to monitor a process (liquid level, flowmeters) or to determine the quality of food products. Since ultrasonic techniques are rapid, non-destructive, easy to automate and relatively inexpensive, the number of applications is rapidly growing in this field. Ultrasonics can also be considered for use in laboratory testing devices to determine physical and chemical properties of foods. Ultrasonics has been used to determine texture, composition and physical state in liquid and solid foods. The commonly measured ultrasonic parameters are velocity, attenua tion and frequency spectrum composition. Velocity is the parameter used most since it is the simplest and most reliable measurement. This paper reviews the basic principles of ultrasonics, the most suit able techniques for each type of application, the testing devices needed to make measurements and the most interesting applications.

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