Vol 39, No 2 (2019)

A mathematical model is proposed for the stress–strain state of a three-layer (sandwich) structure, taking account of nonlinear deformation of the supporting layers. Nonlinear deformation of a symmetric three-layer cylindrical shell under the action of transverse loads is considered, for different boundary conditions.

New approaches to optimizing a magnetorheological transformer are considered. The influence of a rotating magnetic field on the sedimentation of ferromagnetic particles in a magnetorheological fluid is investigated. It proves expedient to use an additional choke channel between the coaxial cylinders in transformer design.

A method is proposed for probabilistic estimates of the maximum possible spring velocity, kinetic energy, displacement, and force in shock-absorber breakdown during system operation. The use of additional rubber-like nonlinearly deforming path limiters in vehicle shock absorbers is shown to be effective.

A method of increasing the performance of a ceramic cutter by changing the alloy structure is considered for the example of a single-carbide hard alloy.

The probability of cracks and fractures in pipe expansion is studied. A means of decreasing defect frequency in the deformation of pipe for major pipelines is proposed.

The synthesis of new materials for supercapacitors is considered. Alloying of active dielectrics based on potassium polytitanates yields nanohybrids with specified properties and high dielectric permittivity. These materials are suitable for the construction of a new generation of supercapacitor structures.

The main problems arising in the modernization of automated lubricant application in robotized stamping are outlined. A device for lubricant application to stamps is described.

Methods of self-programming of the tool trajectory in CNC lathes are considered for the example of turning. By adaptive control, the longitudinal supply is regulated in accordance with the load that acts in cutting.

Tool-inventory management at manufacturing plants is of great theoretical and practical importance. The main management problem here is that it is impossible to take precise account of all the changes in the tool stock for the basic production process. The relevant dynamics may be random as a consequence of the simultaneous action of several factors. In the present work, attention focuses on statistical modeling, which allows many factors to be taken into account and permits the creation of a more precise model of planning, production, and tool consumption at an industrial enterprise

The basing of parts with surfaces of revolution in a self-centering vise and a motionless prism is considered, for the example of a disk and a shaft. In the case of an immobile prism, violation of basing principles produces indeterminacy because of redundant reference points. That gives rise to a basing error.

In operation, the end of the valve tappet in an automobile’s timing mechanism undergoes not only wear but also fatigue crumbling. Several methods of removing the worn cast-iron layer are proposed to restore the gas-distributor components.

Recycling of metal from discarded auto components is expedient and economically efficient. Uses of metal from discarded components are proposed. Information is presented regarding the mechanical properties of structural steels widely used in the auto industry. Technology for recycling of the metal in truck components is identified.