Faculty of Mechanical Engineering, Lj. (FSLJ)
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Vibrational fatigue and structural dynamics at harmonic and random loads [Elektronski vir]Česnik, Martin ; Slavič, Janko, 1978- ; Boltežar, MihaThe presented study experimentally and theoretically researches the vibrational fatigue of the aluminum-alloy specimen at harmonic and random loads. The relation between vibrational fatigue for ... deterministic and random vibration loads is demonstrated with presented experiments and standard frequency-based counting methods. Firstly, a new fatigue testing methodology is proposed to obtain the material fatigue parameters with harmonic basevibration excitation. With the developed methodology it is possible to monitor in real-time the principal stress amplitude at the specimen as well as to track the natural frequency shift and the increase of the structural damping of the specimen due to the accumulated fatigue damage. Secondly, with a validated numerical model of the specimen the mechanical stress transmissibility of the structure was obtained for the case of the random-vibration base excitation. Finally, by respecting the mechanical stress response along with experimentally obtained material fatigue parameters the vibration fatigue life was estimated for the case of the random vibration load. The numerical fatigue life is compared to the experimental one, obtained with the electro-dynamic shaker. The influence of the damping loss factor on the calculated fatigue life is indicated and discussed. The presented research shows new possibilities and critical aspects in the area of accurate high-cycle vibration fatigue life-estimation of dynamic structures.Source: Proceedings of the XI International Conference on Recent Advances in Structural Dynamics, 1-3 July, Pisa, Italy [Elektronski vir] (Datoteka 1045_NT (15 str.))Type of material - conference contributionPublish date - 2013Language - englishCOBISS.SI-ID - 13005595
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source: Proceedings of the XI International Conference on Recent Advances in Structural Dynamics, 1-3 July, Pisa, Italy [Elektronski vir] (Datoteka 1045_NT (15 str.))
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Česnik, Martin | 32073 |
Slavič, Janko, 1978- | 23010 |
Boltežar, Miha | 02034 |
Source: Personal bibliographies
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