ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The mechanical properties of in-service facilities under harsh environment a decrease asmaterials of the facilities degrade. This decrease of mechanical properties can affect the safetyoperation of the facilities. Therefore, the extent of degradation due to prolonged service exposuremust be estimated. Nondestructive evaluation method is a good technique for monitoring the changeof mechanical properties of in-service facilities. The most widely used nondestructive methods are theultrasonic method and the indentation test, which is advantageous with respect of applicability toin-service facilities. The modified theoretical Vary's equation, considering nonlinear response due tomaterial degradation, was proposed for obtaining the correlations between ultrasonic parameters andfracture toughness. Experimental results showed that ultrasonic attenuation, velocity, and nonlinearparameters have significant correlation with fracture toughness and yield strength. The nondestructiveevaluation system can be used to obtain the yield strength and ultrasonic parameters simultaneously,and this information can be used to predict the fracture toughness. The predicted results producedgood correlations with the experimental results, indicating that the nondestructive evaluation systemcan be effective in evaluating material properties and degradation, and the life time of facilities
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.685.pdf
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