Detection of microplastic limit in a structural steel by the measurement of electrical impendance

0398787 - ÚTAM 2014 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Gajdoš, Lubomír - Šperl, Martin - Kaiser, J. - Volák, J. - Mentl, V.
Detection of microplastic limit in a structural steel by the measurement of electrical impendance.
World academy of science, engineering and technology. Vol. 77. Amsterdam: World Academy of Science, Engineering and Technology, 2013, s. 779-782. ISSN 2010-376X.
[International conference on applied science, engineering and technology ICASET 2013. Amsterdam (NL), 15.05.2013-16.05.2013]
Grant CEP: GA ČR(CZ) GAP105/10/2052
Institucionální podpora: RVO:68378297
Klíčová slova: low-C steel * magnetic permeability * microplastic limit
Kód oboru RIV: JL - Únava materiálu a lomová mechanika
http://www.itam.cas.cz/?pid=5

Microplastic strains occurring at stresses below yield stress play a significant role at cyclic loading of metals during high cycle fatigue. Microplastic strains cannot be measured by common methods due to the discontinuity of their distribution and a varying character of their level in the structure of metal but, however, owing to the magneto-elastic effect the threshold stress, at which dislocation pile-up stresses begin to obstruct the magnetic domains in rotation to the direction of the tensile stress, can be determined from magnetic permeability changes during tensile loading. In this paper, the magnetic permeability changes were measured indirectly – by means of electrical impedance changes (a.c. resistance), as there is a direct functional dependence between the a.c. resistance and the magnetic permeability.
Trvalý link: http://hdl.handle.net/11104/0226866