Nonlinear Ultrasonic Method to Evaluate Residual Mechanical Properties of Thermally Damaged Concrete

2014 ◽  
Vol 111 (4) ◽  
Author(s):  
Hong Jae Yim ◽  
Sun-Jong Park ◽  
Jae Hong Kim ◽  
Hyo-Gyoung Kwak
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Method ◽  
Nonlinear Ultrasonic ◽  
Residual Mechanical Properties ◽  
Nonlinear Ultrasonic Method

scholarly journals Assessment of sensitization in AISI 304 stainless steel by nonlinear ultrasonic method

2013 ◽  
Vol 26 (5) ◽  
pp. 545-552 ◽  
Author(s):  
Saju T. Abraham ◽  
S. K. Albert ◽  
C. R. Das ◽  
N. Parvathavarthini ◽  
B. Venkatraman ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ultrasonic Method ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Nonlinear Ultrasonic ◽  
Nonlinear Ultrasonic Method

Evaluation of freezing and thawing damage of concrete using a nonlinear ultrasonic method

2016 ◽  
Vol 17 (1) ◽  
pp. 45-58 ◽  
Author(s):  
Hong Jae Yim ◽  
Sun-Jong Park ◽  
Jae Hong Kim ◽  
Hyo-Gyong Kwak
Keyword(s):  
Ultrasonic Method ◽  
Freezing And Thawing ◽  
Nonlinear Ultrasonic ◽  
Nonlinear Ultrasonic Method

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 .

A nonlinear ultrasonic method for real-time bolt looseness monitoring using PZT transducer–enabled vibro-acoustic modulation

2019 ◽  
Vol 31 (3) ◽  
pp. 364-376 ◽  
Author(s):  
Nan Zhao ◽  
Linsheng Huo ◽  
Gangbing Song
Keyword(s):  
Real Time ◽  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Ultrasonic Method ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Modulation Method ◽  
Nonlinear Ultrasonic ◽  
Acoustic Modulation ◽  
Nonlinear Ultrasonic Method

A real-time nonlinear ultrasonic method based on vibro-acoustic modulation is applied to monitor early bolt looseness quantitatively by using piezoceramic transducers. In addition to the ability to detect the early bolt looseness, a major contribution is that we replaced the shaker, which is commonly used in a vibro-acoustic modulation method, by a permanently installed and low-cost lead zirconate titanate patch. In vibro-acoustic modulation, when stimulating two input waves with distinctive frequencies, namely the high-frequency probing wave and the low-frequency pumping wave, the high-frequency probing wave will be modulated by the low-frequency pumping wave to generate sidebands in terms of bolt looseness. Thus, the influence of low-frequency voltage amplitudes on the modulation results, which is ambiguous in previous research, is also analyzed in this article. The results of experiment demonstrated that the lead zirconate titanate–enabled vibro-acoustic modulation method is reliable and easy to implement to identify the bolt looseness continuously and quantitatively. In addition, low-frequency amplitudes of actuating voltage should be selected in a reasonable range. Finally, we compared the vibro-acoustic modulation method with the time-reversal method based on the linear ultrasonic theory, and the result illustrates that vibro-acoustic modulation method has better performance in monitoring the early bolt looseness.

Characterisation of heterogeneous microstructure in large forged products using nonlinear ultrasonic method

2020 ◽  
Vol 36 (6) ◽  
pp. 699-708 ◽  
Author(s):  
Saju T. Abraham ◽  
S. Shivaprasad ◽  
C.R. Das ◽  
S. K. Albert ◽  
B. Venkatraman ◽  
...  
Keyword(s):  
Ultrasonic Method ◽  
Heterogeneous Microstructure ◽  
Nonlinear Ultrasonic ◽  
Nonlinear Ultrasonic Method
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