[고체역학실험] Principle of Ultrasonic testing(영문)

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[고체역학실험] Principle of Ultrasonic testing(영문)에 대한 자료입니다.

1. Experimental goal

2. Experimental theory

* Principle of Ultrasonic testing

* Pulse-Echo and Pulse-Echo-Overlap Methods

* Advantages & Disadvantages of Ultrasonic testing

3. Experimental tools

4. experimental method

5. experimental data

6. Discussion

본문내용

3. Experimental tools
1) Ultrasonic detector
It is widespread use of equipment that used in ultra sonic testing. And it also have lots of control function.

2) probe
A protected face transducer is a single element longitudinal wave contact transducer that can be used with either a delay line, protective membrane, or protective wear cap.

3) couplant A couplantis a material (usually liquid) that facilitates the transmission of ultrasonic energy from the transducer into the test specimen. Couplant is generally necessary because the acoustic impedance mismatch between air and solids (i.e. such as the test specimen) is large. Therefore, nearly all of the energy is reflected and very little is transmitted into the test material. The couplant displaces the air and makes it possible to get more sound energy into the test specimen so that a usable ultrasonic signal can be obtained. In contact ultrasonic testing a thin film of oil, glycerin or water is generally used between the transducer and the test surface.
When scanning over the part or making precise measurements, an immersion technique is often used. In immersionultrasonic testing both the transducer and the part are immersed in the couplant, which is typically water. This method of coupling makes it easier to maintain consistent coupling while moving and manipulating the transducer and/or the part.

참고문헌

1. http://www.ndt-ed.org/
2. http://www.ndt.net/
3. http://en.wikipedia.org/wiki/Ultrasonic_testing
4. Nondestructive Testing Handbook, Third ed.: Volume 7, Ultrasonic Testing. Columbus,
5. Albert S. Birks, Robert E. Green, Jr. technical editors ; Paul McIntire, editor. Ultrasonic testing, 2nd ed. Columbus,

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