文档介绍：Module 5
Nondestructive testing
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Nondestructive testing (NDT) is a wide group of analysis techniques used in science and industry to evaluate the properties of a material, component or system without causing damage.[1] Because NDT does not permanently alter the article being inspected, it is a highly-valuable technique that can save both money and time in product evaluation, troubleshooting, and research. Common NDT methods include ultrasonic, ic-particle, liquid rant, radiographic, and eddy-current testing.[1] NDT is monly-used tool in forensic engineering, mechanical engineering, electrical engineering, civil engineering, systems engineering, medicine, and art.[1]
Contents
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1 Methods
2 Applied NDT Examples
Weld Verification
Structural Mechanics
Radiography in Medicine
3 Notable events in early industrial NDT
4 Applications
5 Methods and techniques
6 Terminology
7 Reliability and statistics
8 See also
9 References
10 External links
[edit] Methods
NDT methods may rely upon use of ic radiation, sound, and inherent properties of materials to examine samples. This includes some kinds of microscopy to examine external surfaces in detail, although sample preparation techniques for metallography, optical microscopy and electron microscopy are generally destructive as the surfaces must be made smooth through polishing or the sample must be electron transparent in thickness. The inside of a sample can be examined with rating ic radiation, such as X-rays, or with sound waves in the case of ultrasonic testing. Contrast between a defect and the bulk of the sample may be enhanced for visual examination by the unaided eye by using liquids to rate
fatigue cracks. One method (liquid rant testing) involves using dyes, fluorescent or non-fluorescing, in fluids for non-ic materials, usually metals. monly used method for ic materials involves using a liquid suspension of fine iron particles applied to a pa