Аннотация:
The method for assessing the lifetime of structural elements by the criterion of fatigue strength is
improved. It includes tests of laboratory material samples, the positions of the statistical theory of similarity
of fatigue failure, calculation of the stress state by the finite elements method and takes into account the
nature of cyclic loading with variable amplitude. A way for calculating the equivalence coefficient by the
cycles μm is proposed, which takes into account the characteristics of fatigue strength and the cyclogram of
the loading of the machine elements. Mathematical descriptions of integral distribution functions for typical
loading modes (heavy, medium equiprobable, medium normal, light and especially light) are given and on
their basis the corresponding loading cyclograms are obtained. The technique is implemented on the example
of one of the main parts of an axial piston hydraulic machine (APHM) – a cylinder block (CB) made of tin
bronze CuSn12. The possibilities of increasing the working pressure in the APHM by constructive and
technological methods are analyzed. It is shown that in the manufacture of CВ from high-strength antifriction
brass Zn28Mn3Co2, it is possible to increase the operating pressure in the APHM to 40 MPa, which for
heavy duty operation will provide a CВ lifetime more than nine thousand hours.
