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  • Determination of SN curves of spring steel material as a fast and reliable method using a high-frequency pulsator cracktronic
    Borković, Predrag ...
    The dynamic property of a given material is mostly expressed by its SN curves. Since the classical determination of SN curves involves testing on specimens at low frequencies, resulting with longer ... testing time, a faster method for determination of SN curves is required. Cracktronic pulsator is one of most used operating machines for SN curve determination. Generally, by using crakctronic pulsator it is possible to reduce the testing time by six times, as the operating frequencies for classical method and cracktronic pulsator are 30 Hz and 180 Hz, respectively. This time reduction of testing may be from high importance during developing and simulation of a new part. Furthermore, for extending and proving an existing database in FEM based software it is also necessary to have fast and valid information about dynamic properties of selected material. During investigation of SN curves, standard Charpy V-notched specimens were used in bending loading condition with the constant amplitude. All specimens were cut off from high-quality flat spring steel 51CrV4. After machining specimens were heat-treated, first quenched in nitrogen and then tempered at two different tempering temperatures. Also, the specimens were divided into two groups of different orientation relative to the intensity of alloying elements, parallel and perpendicular to the segregation of alloying elements. Obtained new SN curves were compared to existing SN curves acquired by classical fatigue testing in compression-tension mode of loading. At the end of investigation, loading simulation of a leaf spring is performed in order to assess the fatigue life of thereal spring with exact dimensions.
    Vir: Program in knjiga povzetkov = Program and book of abstracts (Str. 45)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 964522

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