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:
In this study, we propose a new technique to evaluate some properties during fracturepropagation, such as stress at the crack surface and the propagating-route by measuring distributionsof leaked magnetic flux vector from the residual magnetization in the vicinity of the fracture surface.The technique involves the application of an inverse-magnetostrictive effect in ferromagneticmaterials, such as tempered 11/4Cr-1/2Mo steels below the ductile-brittle transition temperature.The maximum magnetic flux density was increased with impact absorption energy measured byCharpy impact test. The highest magnetic flux density located at the crack starting point, where afish-eye type surface morphology was observed in fractographic analysis. It indicates the higheststress for fracture initiation at this point. According to the analysis, the change in the magnetic fluxvectors corresponds with the direction of crack propagation, which was well explained from themagnetostrictive properties of iron. The measurement of magnetic flux density distribution will beuseful for the fractographic analysis to discuss the in-situ phenomena that are difficult to obtain inprevious methods
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.549.pdf
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