1. Slobodanka Boljanović, High School of Mechanical Engineering, Belgrade, Serbia
2. Stevan Maksimović, Vojnotehnički Institut Beograd, Serbia
3. Strain Posavljak, Faculty of Mechanical Engineering,
Republic of Srpska, Bosnia and Herzegovina
Components of machines and structures are frequently subjected to repeated loading which may lead to their failure due to fatigue. For prevention of such failures, it is very important to establish efficient methods that enable determination of fatigue life. In view of complexity of fatigue as process, fatigue life analysis has to be considered as crack initiation phase and crack growth phase. In this paper authors have formulated computational method for crack growth life prediction of structural components with surface crack subjected to cyclic loading. For fatigue life estimation it is necessary to consider and include adequate criteria. Further, in the residual life calculation of a planar crack configuration, the stress-ratio dependence crack growth model is implemented for both, depth and surface directions. As a primary parameter, the stress intensity factor is defined for fatigue life analysis. The functional relationship between the stress intensity factor and crack length, which is needed for fatigue life estimation for crack propagation from the initial to the critical length is obtained using analytical and/or numerical approaches. Predicted results are compared with available experimental data. A good agreement between the computation and experimental results has been obtained.
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