Оцінка міцності вкритої шаруватим покриттям ділянки штока бурового насоса з урахуванням позаштатних напружень
The stressed-deformed state of the double-coated rod part of a bucket pump is researched. The coating has a steel base and some aluminum sputtering; the part of upper aluminum layer gets affected by microarc oxidation then. A non-homogeneous beam model, which has a multiple cross section and the varying parameters of elasticity and strength, is studied. Primarily, the model is kept within normal rod load; secondarily, it is put to the emergency, caused by the wearing of crosshead and frame rails friction couple.