Abstract
Important goal of Structural Health Monitoring is detection of disintegration process in material in early stage of operation. One possibility is by monitoring the influence of surface degradation process on change of residual stresses during fatigue loading. Results of this investigation are important in analysis of condition and possibility for a Fiber Bragg Grating sensor installation for continuous strain measurements on the surface. The initial condition of the material surface is a consequence of sheet Al7075-T6 plate manufacturing procedure, but during the high cycling fatigue loading, the surface degradation with micro-grain separation occurred. Quantitative measurement of this process consist SEM surface analysis and residual stress measurement in some stage of fatigue loading. It was found the material surface is affected by fatigue loading level and loading ratio. Electropolished and no-electropolished surface have been observed and analyzed. Results show that the range of residual stress change is the similar after same number of fatigue cycles.
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