Use of analytical mechanics in defining acoustic-test methodology
One of the more pressing needs is the ability to measure the level of stress in materials due either to active loading or to the residual strains caused by plastic deformation. Acoustic techniques have not been exploited on a routine testing basis for stress determination because their use requires not only very sophisticated instrumentation, but also because they are difficult to automate and require laborious and delicate personal operation. However, the development of small, inexpensive micro- and mini-computers which can be dedicated to single tasks offers the possibiity of designing acoustic nondestructive evaluation (ANDE) procedures which will be accurate, reasonably priced and for which the computer may provide automated testing and data processing. A number of different ANDE measurements can be made, but the problem is to define their sensitivity and accuracy in order to choose one or more which are useful in a production sense. This paper describes several of these acoustic methods and the type of results which are to be expected when testing a tensile specimen with single or double edge cracks. The conclusion of this study should be applicable to acoustic NDE tests conducted to determine stress distributions in other specimen shapes.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Washington Univ., Seattle (USA). Dept. of Mechanical Engineering
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5183391
- Report Number(s):
- SAND-82-8223; ON: DE82018615; TRN: 82-016386
- Country of Publication:
- United States
- Language:
- English
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