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The article dwells on a model of a surface crack growth for a cylinder of a long-stroke compressor taking into account plastic deformations in a crack tip and a type of loading. We have obtained experimental data for cross-shaped samples made of engineering material; the samples have been used to study the effect of biaxial loading on a crack growth rate. The crack growth has been examined comparing the results obtained under monoaxial tension and under biaxial compression-tension. The fracture in a fatigue crack tip is presented as a combination of brittle fracture on a crack tip and as a ductile fracture in a propagation zone of plastic deformations. The finite element method with linear hardening in a zone of plastic deformations have been used to explore a stress state in a crack zone. The formula is proposed to determine the growth rate of fatigue cracks taking into account brittle and ductile stress parameters in the crack tip

The Fatigue Surface Cracks Growth Model Taking into Account Plastic Deformations for a Cylinder of a Low-speed Long-stroke Compressor