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.

Regional stress fields in the flysh deposits in the valley of the Rybnyk river determined by complex method of joints and slickensides studies

The article is devoted to the tectonophysical researches which are carry out in the valley of Rybnyk river right affluent of river Stryy. Research included the study of joints by structural parageneses and slickensides by kinematic methods in four thrust of Skyba nappe: Parashka, Malmanstalska, Zelemianka, Rozhanka. The stress fields after slickensides and joints on the basis of collected from outcroppings along the valley of this river tectonophysical data was reconstructed.

Jointing of rocks of flish complex of the Ukrainian Carpathians between Opir and Oryava rivers, their tectonic significance

The article is devoted to importance of joints which are the most widespread structural elements of the earth's crust and are in all lithologic types of mountain breeds, for the study of the tense state and mechanical conduct of mountain breeds. Joints are the perceptible indicators of tensions at geotectonics development of territory. Determination of the real dependence of correlations between joints and reasons of their origin enables to use joints for paleotectonic reconstructions, and also at created models of reservoirs in oil geology.

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.