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  • Experimental comparison of multiaxial-criteria in frequency-domain [Elektronski vir]
    Mršnik, Matjaž ; Slavič, Janko, 1978- ; Boltežar, Miha
    Vibration endurance must be ensured for structures that will be exposed to different vibratory loads, originating from environment and rotating and other machinery. Tests are usually done in the lab ... to that end, using shakers and other equipment. With the help of some stateof- art vibration fatigue methods vibration endurance can be analyzed and estimated already beforehand. The analysis procedure consists of structural dynamics analysis and is followed by fatigue analysis made on the resulting stress states. For broad-band excitation these are of random nature and very suitable for frequency-domain approach, e.g. fatigue cycle analysis of (equivalent) uni-axial stress which is well researched. This study researches the multi-axial criteria that are used to reduce the complex multi-axial stress state to an equivalent uniaxial stress. Several multi-axial criteria formulated for the frequency-domain can be found in literature. However, experimental studies exploiting natural response to induce multi-axial stress state are less frequent. This research first presents and then theoretically and experimentally compares selected multi-axial criteria for analysis in frequency-domain. The criteria of maximum normal stress, maximum shear stress and the C-S criterion are considered. Next, an experiment is performed to provide experimental data which serves as a basis for experimental comparison of selected multi-axial criteria. A special specimen is used with significant resonances present in the frequency range of applied vibration. Two broadband excitation sources are used to excite the specimen simultaneously. Time-to-failure results are compared across multi-axial criteria and with experimental data. Accuracy of multi-axial criteria is assessed with the aim of choosing the criterion that is most suitable for analysis of random stress response. Experimental data also show that selected methods give reliable time-to-failure estimates and can be used for fatigue analysis of mechanical structures exposed to broadband random vibration.
    Vir: Proceedings of ICoEV 2015 [Elektronski vir] (F. 783-791)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2015
    Jezik - angleški
    COBISS.SI-ID - 14172443

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