The paper analyzes the car variator reliability issue. The variator performance is ensured by the surface layer quality, manufacturing accuracy, and the pulley and steel V-belt surface microrelief. The decisive factor in ensuring the variator reliability is the pulley finishing technique. Creating regular microreliefs on the finished pulley surface by laser ablation has been proposed, which act as micro-channels to improve the drainage of oil from the contact pattern. Creating oil channels on the pulley surface by laser ablation will ensure their arrangement and allow obtaining the desired pattern, direction, depth, and length.
The article provides a methodology for the experimental determination of the concentration coefficients ασ and the gradients of the principal stresses. The effectiveness of the experimental method of photoelasticityis shown for studying the stress-strain state of parts of complex shape in the presence of stress concentrators, as well as for solving problems of brittle strength by methods of linear fracture mechanics.
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