MAE43872 - Nondestructive evaluation (NDE) Topic 7 Reading...

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Nondestructive evaluation (NDE) Topic 7
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Reading assignment Notes on Nondestructive Evaluation in the course website. Sec. 8.2, 8.3 and 8.4, William Callister, Materials Science and Engineering, 6 th Ed.
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Nondestructive testing (NDT)
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Conventional NDE mthods Liquid penetrant inspection Ultrasonic inspection Acoustic emission Magnetic particle inspection Eddy current testing X-radiography
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Liquid penetrant inspection For detection of surface defects Inexpensive and convenient Largely used on nonmagnetic materials for which magnetic particle inspection is not possible. Unable to inspect subsurface flaws. Loss of resolution on porous materials.
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Penetrant High-visibility liquid
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Liquid penetrant inspection method 1. Apply a penetrant to the surface. 2. Pull penetrant to the surface crack by capillary action. 3. Remove excessive penetrant. 4. Extract some penetrant to the surface.
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Ultrasonic inspection
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Audible frequency range 20 – 20,000 Hz
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Ultrasonic inspection Ultrasonic wave has higher frequency than audible sound. Typical frequency from 25 to 100,000 MHz. Method: Send an ultrasonic wave (from a piezoelectric transducer) through the material (via a transmitting medium) and measure the intensity of the reflected or transmitted wave, and the time it takes for the wave to be detected.
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Ultrasonic inspection Ultrasonic wave has higher frequency than audible sound. Typical frequency from 25 to 100,000 MHz. Method: Send an ultrasonic wave through the material and measure the intensity of the reflected or transmitted wave, and the time it takes for the wave to be detected.
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Through-transmission configuration (two transducers)
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Pulse-echo mode (2
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Single transducer
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Single transducer connected to the material by water (an acoustic coupling medium) Pulse-echo mode
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MAE43872 - Nondestructive evaluation (NDE) Topic 7 Reading...

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