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http://dx.doi.org/10.12989/scs.2019.32.3.305

Effect of fatigue crack propagation on natural frequencies of system in AISI 4140 Steel  

Bilge, Habibullah (Department of Mechanical Engineering, Abant Izzet Baysal University)
Doruk, Emre (R&D Department, TOFAS-FIAT)
Findik, Fehim (Department of Metallurgical and Materials Engineering, Sakarya University of Applied Science)
Pakdil, Murat (Department of Mechanical Engineering, Abant Izzet Baysal University)
Publication Information
Steel and Composite Structures / v.32, no.3, 2019 , pp. 305-312 More about this Journal
Abstract
In this study, we investigated the effect of fatigue crack propagation of the beams which have a vital importance in engineering applications, on the natural frequency of the system. Beams which have a wide range of applications, are used as fundamental structural elements in engineering structures. Therefore, early detection of any damages in these structures is of vital importance for the prevention of possible destructive damages. One of the widely used methods of early detection of damages is the vibration analysis of the structure. Hence, it is of vital importance to detect and monitor any changes in the natural frequencies of the structure. From this standpoint, in this study we experimentally investigated the effect of fatigue crack propagation on beams produced from 4140 steel, of the natural frequency of the beam. A crack was opened on the $8{\times}16{\times}500mm$ beam using a 3 mm long and 0.25 mm wide wire erosion. The beam, then, underwent 3 point bending tests at 10 Hz with a dynamic fatigue device and its natural frequencies were measured in scheduled intervals and any changes taking place on the natural frequencies of the beam were measured. This data allowed us to identify and measure the crack occurring on the beam subjected to dynamic loading, during the propagation phase. This method produced experimental data. The experimental data showed that the natural frequency of the beam decreased with the propagation of the fatigue crack on the beam.
Keywords
vibration analysis; cracked beam; fatigue crack propagation; natural frequency;
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Times Cited By KSCI : 5  (Citation Analysis)
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