...). known (and fixed) displacements. Newton s second law gives the particles motion resulting from the known (and fixed) forces acting on them. The interface between the particles is numerically represented as a contact surface formed between two particle edges. 3.1 Contact stress-displacement law...

... that the main part of drilling energy is consumed not for the rock removal, but rather by the microfracture, shearing and crushing of rock in the zone of high hydrostatic pressure under the tool/rock contact surface. RÉSUMÉ: Une approche a l'optimisation des outils de forage qui est basee sur une analyse de...

... Struktur, die durch die Blöcke gebildet ist und geometrische Eigenschaften der Punktberührungen. upstream oil & gas relation reservoir characterization equation of state assumption rock model treated rock mechanic contact surface deformation rock block coefficient rock massif conic...

... rock foundation strength characteristic contact zone contact surface reservoir characterization displacement investigation block displacement strength stress state resistance principal stress 3-53 Strength Characteristics of Rock Foundation and Concrete- Rock Contact Proprietes de...

...). The tests were performed with shear surfaces of about 5.00 m 2 and the normal pressures of various intensities up to the maximum of 25 kg/cm 2 were applied. Later on, on the same places, the shear strengths on the concrete-limestone contact surfaces were tested as well. By the tests it was established...