This paper describes a structural analysis of the CAD model three versions fixators Sarafix which is to explore the possibility of introducing composite materials in the construction of the connecting rod fixators comparing values of displacement and stiffness at characteristic structure points. Namely, we have investigated the constructional performance of fixators Sarafix with a connecting rod formed from three different composite materials, the same matrix (epoxy resin) with three different types of fibers (E glass, kevlar 49 and carbonM55J). The results of the structural analysis fixators Sarafix with a connecting rod made of composite materials are compared with the results of tubular connecting rod fixators made of stainless steel. After comparing the results, from the aspect of stiffness, we gave the final considerations about composite material which provides an adequate substitution for the existing material.

The paper provides mathematical model for solution of lubrication problem in case of mixed friction, i.e. when total contact load of two bodies is partially transmitted through the peaks of roughness of a solid contact, and partly through the pressure generated in the oil film. Mathematical model used for solution of lubricated contact with mixed friction is based on the bases of thermoelasto-hydrodynamic (TEHD) theory of lubrication expanded by equation of solid bodies contact. Based on the presented m athematical TEHD model own computer program was developed, which enables rapid analysis of tribological parameters at the point of contact of two bodies (the thickness of the oil film, the pressure transmitted by solid body, the pressure transmitted by fluids, temperature in the oil film) in the function of working conditions parameters. © 2014 The Authors. Published by Elsevier Ltd. Selection and peer-review under responsibility of DAAAM International Vienna.