EXPERIMENTAL TECHNIQUE FOR THE STUDY OF THE LOCAL DEFORMATION DAMAGE INFLUENCE ON THE FATIGUE CRACK GROWTH PROCESS
Journal Title: Проблеми тертя та зношування - Year 2016, Vol 70, Issue
Abstract
The experimental technique for the study of the local damage influence on the fatigue crack growth process is presented in the paper. The described technique aimed on the development of the new method for the prediction of fatigue crack propagation in alclad alloys. The fatigue process is considered as a consisting of two stages, namely the stage of crack nucleation and crack propagation. Both stages have statistical probabilistic nature, thus the crack can start its propagation on the different fatigue damage backgrounds. It is presumed that the state of metal in the point of transition from the first stage to the second influences the crack propagation. The key point of the technique and correspondent method is a possibility to assess accumulated fatigue damage by the parameters of the surface deformation relief. The deformation relief is a system of extrusions, intrusions and persistent slip bands. Quantitative analysis of deformation relief and associated fatigue damage is performed by the computer aided light microscopy and correspondent original software. The tests for experimental approval of the proposed technique have been carried out. The strong correlation relationship between the local fatigue damage near the stress concentrator and crack propagation duration has been revealed. The new method will be implemented into the procedure of the full scale fatigue test of planes.
Authors and Affiliations
M. KARUSKEVICH, E. KORCHUK, S. SCHEPAK
Keywords
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