PREDICTION OF STRAIN AND STRESS PARAMETERS OF SIMPLE TRICOT

Chernous D.A., Candidate of Technical Sciences; V.A. Belyi Metal-Polymer Research Institute of NAS of Belarus, Gomel. The Republic of Belarus

Shilko S.V., Candidate of Technical Sciences; V.A. Belyi Metal-Polymer Research Institute of NAS of Belarus, Gomel. The Republic of Belarus

Charkovskii A.V., Candidate of Technical Sciences; Vitebsk State Technological University, Vitebsk, The Republic of Belarus

Tkhoreva I.M., Vitebsk State Technological University, Vitebsk, The Republic of Belarus

Panin S.V., Doctor of Physical and Mathematical Sciences; Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia

The simplified technique of mechanical characteristics of tricot, based on structural element extraction, is developed. The given technique differs from earlier known for relative simplicity of a mathematical description and possibility to predict strength parameters of tricot. The results the developed technique and experimental data about strength of tricot defined by a method "press through by a ball" are compared.

Tricot, mechanical characteristics, strength parameters

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CALCULATION OF PRESSURE IN WOODWORKING TOOL FROM THE FORCES PARALLEL TO A BISECTOR OF A POINT OF A CUTTER

Grishkevich A.A., Candidate of Technical Sciences, Belarusian State Technological University, Minsk, the Republic of Belarus

In article the basic directions of calculation the metal-cutting tool on durability are generalised. Formulas for calculation of normal pressure in cross-section section of a cutting edge of the tool from the forces parallel to a bisector of a point of a cutter are received. Pressure are defined with the account uncentred appendices of equally effective continuous loading on cutting edge.

Metal-cutting tool, normal pressure, cross-section section, cutting edge

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MODELING OF NATURAL VIBRATIONS OF THE RECONSTRUCTED MIDDLE EAR SUBJECTED TO TYMPANOPLASTY AND PARTIAL STAPEDOPLASTY

Shashkova E.A., Vitebsk State Medical University; the Republic of Belarus

Mikhasev G.I., Doctor of Physical and Mathematical Sciences; Belarusian State University, Minsk, the Republic of Belarus

The reconstructed middle ear consisting of a thin annular plate made of cartilage and a T-type inclined prosthesis replacing the malleus-incus-stapes chain and interposed between the stapes base and the artificial eardrum is considered. A system of non-linear differential equations describing free radially non-symmetric vibrations of the system is derived. The natural frequencies of the system in the case of linear vibrations are investigated.

Middle ear, artificial eardrum, non-symmetric vibrations, T-type inclined prosthesis

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INFLUENCE OF THE TOOL PRESSURE UPON THE POSITION OF THE INSTANTANEOUS AXIS OF ROTATION OF THE BALL DURING THE FINISHING BETWEEN THE TWO RINGS AND THE PLATE

Schetnikovich K.G., Candidate of Technical Sciences; Belarusian National Technical University, Minsk, the Republic of Belarus

The differential equations of movement of the ball with the account of the cage resistance have been compiled. The cohesive and friction forces acting on the balls in the machining zone during the sliding over one and two surfaces of contact with the tool have been determined. The dependence between the loads on the rings and angle of tilt of the instantaneous axis of rotation of the ball has been obtained.

Cage resistance, cohesive and friction forces, ball, sliding

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