Abstract
To solve urgent problems of ensuring the vehicles parts reliability under alternating loads, it is necessary to study the influence of operational conditions on the accumulation of fatigue damage in the material, leading to the appearance of micro- and macrocracks. The purpose of this work is to study the influence of fatigue damage formed in spring steel under operational impacts typical of the cryolithozone on the level of its resistance to brittle fracture. Methods of mathematical statistics and methods of metal research (metallography, fractography, microindentation, mechanical testing, etc.) were used in the work. Two main types of structural damage are identified, differing in scale level: microdamage, reflected by the microhardness parameter, and mesodamages in the form of pores of various diameters. New data on poorly studied fatigue damage accumulation processes under non-stationary loading and their influence on brittle fracture resistance were obtained. Mechanism of the effect of porosity on brittle fracture resistance is associated with the occurrence of deformation processes in the vicinity of pores, as well as during growth and coalescence of pores. The research results can be used to develop methods for obtaining and information processing on the structural damage of materials and to extend the service life of elastic elements of vehicles operating in the cryolithozone.
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