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Whereas formerly metallic materials were used extensively and for various purposes in the machines manufacturing industry, nowadays new materials are sought that can replace the "conventional" machines manufacturing materials with new ones. This is especially challenging in areas where parts need to be able to withstand very tough conditions, such as high temperatures or large forces applied to them. The current paper intends to analyze some of the most widely used materials for high-strength applications. A special focus in this regard is on the one hand in fiber-reinforced composite materials with the polymer matrix and on the other hand on basalt. The most important properties, processing technologies and applications of these materials are analyzed and discussed and conclusions are drawn regarding their compatibility with the intended purpose.

During the tests for evaluating shock behavior for certain alloy steels, one of the stages consists of an analysis of geometrical and structural degradations. These degradations are functions of stress distribution, values, and module of plastic and elastic deformation energies involved. High values of kinetic energy generated at shock imposed the necessity for a scientific model of study / simulation. The presented model allows a further extension for ranges of values and restrictions imposed to shock stresses for certain alloy steels special structures. In order to evaluate and calibrate the presented model, some experiments were conducted. Data resulted from experiments was compared to data resulted during simulations. After calibration and confirmation of proposed model, new parameters could be computed, parameters that were unavailable in experimental studies. The present paper presents some considerations regarding the adopted methodology, results, and perspective for further experimental trials and simulations.

The quality of the natural gas extracted from deposits and transported through pipelines is a major factor in achieving the desired heating properties of the gas. A big problem related to the quality is the presence of impurities such as dust, sand or water. These can be removed by using separators. This paper presents an analysis of the efficiency of a cyclone-type separator in terms of speeds and pressure drops, using the computational fluid dynamics (CFD) method in the case of separating water droplets from the main gas flow.