Abstract
Abstract
The possibility of using fatigue gauges to detect cracks and crack-like defects that occur at some depth in the specimens was investigated. Industrial tin foil with additional annealing was used. Subsurface cracks were modeled by cross drilling followed by cutting with steel wire. The distribution of appearing stresses under the action of static load was estimated by the finite element method. In the presence of a subsurface crack, the first manifestations of fatigue damage on the gauge surface are observed in two zones located from the dangerous section at a distance approximately equal to the depth of the crack. This allows not only to diagnose the presence of cracks and similar defects, but also to determine the distance from the top of the crack to the surface of the specimen.