Modeling of “combined cutter - cone” connection in tricone drill bits

A theoretical analysis of the stiffness of the “cutter-cone” connection was performed. In the article the character and magnitude of the tension at the contact of "cutter-cone" are investigated. An analysis of the surface of the openings for carbide inserts revealed traces of plastic deformation and fretting wear.

Stress fields in the flysh strata of the thrusts of Orivska, Skolivska and Parashka (by researches in the basin of the Sukil river)

In the article the first results of researches of joints and slickensides from outcroppings in the valley of the Sukil River are given. In 37 points of the flysh deposits of thrusts: Orivska, Skolivska and Parashka about 1100 intentions of joints and 90 intentions of slickensides are executed in the different deposits strata: from the Upper Cretaceous to Oligocene formations.

Tectonic paleostress fields evolution and calcite veins formation in the southeastern part of the Ukrainian Carpathians during the cenozoic time

Purpose. The main purpose of this paper is to study tectonic paleostress field evolution, its influence on the calcite veins formation and fluid flow in the southeastern part of the Ukrainian Carpathians during the Cenozoic time. The objects of our studies are joints parageneses, slickensides and veins in the Cretaceous sandstones located over the Chornohora, Dukla, Porkulets and Rakhiv nappes in the southeastern part of the Ukrainian Carpathians. Methods. To reconstruct the stress-strain state structural-paragenetic and kinematic methods were used.