TY - GEN TI - Micro-plastic limit of low-carbon steel CSN 41 1375 as determined by the measurement of electrical impedance T3 - Zvyšování životnosti komponent energetických zařízení v elektrárnách /8./ AU - Gajdoš, Lubomír AB - It is generally accepted that not all cyclic stresses below the fatigue limit are non-damaging. Particularly in spectrum loading, the inclusion of some cyclic stresses below the fatigue limi can reduce the fatigue life of a component. It is believed that the boundary between damaging and non-damaging stresses is the so-called micro-plastic limit (MPL) defined as a macro-stress at which dislocation pile-up stresses begin to obstruct the magnetic domains in rotation to the direction of the tensile stress. This paper shows that MPL can be determined from changes in magnetic permeability during tensile loading. In our work, changes in magnetic permeability were measured indirectly - by measuring changes in electrical impedance (a.c. resistence and induktance). Measurements were performed on normalized low-C steel CSN 411375, and the microplastic limit was determined by evaluating SN - 978-80-261-0272-4 UR - http://hdl.handle.net/11104/0226242 UR - http://www.nusl.cz/ntk/nusl-161500 A2 - Mentl, V. A2 - Šperl, Martin A2 - Kaiser, J. LA - eng KW - fatigue KW - damage KW - microplastic limit PY - 2013 PB - Ústav teoretické a aplikované mechaniky, Prosecká 76, 190 00 Praha 9, http://www.itam.cas.cz/ ER -