Abstract
The SN characteristic which is applied in the fatigue investigations Wohler curve determines the number of cycles necessary for the entire destruction of an investigated element as a function of the load amplitude. The estimation of a crack propagation during a fatigue process can be described by the Paris equation and presented in a form of co-ordinates: the crack growth rate as a function of a stress intensity factor range depending on an exterior load and the exterior geometry of the investigated element, as well as on the geometry of a crack* In this paper the transformation method of the Paris curve into the Wohler curve, in the range of line fracture mechanics, FM, is presented. The obtained FM-SN curves make it possible to compare the fatigue crack propagation results with the SN curves. In the given example, concerning the fatigue crack calculations of the container hatch corners, the FM-SN curves were presented in comparison with the SN standard ones.
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