Temat: materials engineering - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of dimensional proportions of cylindrical explosive on resulting blast wave
Autorzy:: Panowicz, R.
Trypolin, M.
Konarzewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/247380.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: materials engineering
mechanical engineering
Opis:: Explosives are broadly used today in many applications, both civilian and military. Many experiments involving explosives use either ball or cylinder charges. However, there can be raised a question whether an exact shape influences the resulting blast wave, and, additionally, if the length to diameter ratio of the cylinder influences the wave. To answer the question, numerical analysis was conducted. A 3D model of the charge was constructed in LS-Prepost software and calculated with use of an explicit FEM method in LS-DYNA software. To determine the change of character of the blast wave, the dimensions of the charge change, whereas the mass and distance from the centre of the charge are constant. Several length to diameter ratios was tested, starting from 0.25, to 2, in 0.25 increments. Two explosives, HMX and TNT, were used. As expected, the resulting Blast wave was different in each case, with 100% difference in pressure values between 0.25 and 2 L to D ratios, especially along the length axis of the cylinder. The results show that the exact diameters of the charges need to be taken into consideration while determining a type of charge to be used as well as determining the goal to be achieved during a particular conducted experiment.
Źródło:: Journal of KONES; 2016, 23, 4; 375-380
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Parameters selection of shot peening gears of carburized and hardened steel 21NiCrMo2
Autorzy:: Tchórz, T.
Śnieżek, L.
Grzelak, K.
Mierzyński, J.
Powiązania:: https://bibliotekanauki.pl/articles/245218.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: materials engineering
shot peening
vehicles
gears
Opis:: This article presents the methodology of shot peening gears’ parameters selection used in agricultural tractor transmission. The gears made of steel have been treated with 21NiCrMo2 thermal-chemical consisting of carburization to the depth of 0.8 mm and subsequently hardened. The hardness of the side teeth surface after hardening was 58 HRC. The same process of thermo chemical was used for flat samples with dimensions 120×12×5 mm. Prepared samples were divided into two series. First shot peening was treated with spherical pellet with a varied diameter from 0.4 mm to 2.5 mm. For second series samples additional treatment of shot peening was not carried out. Then micro-hardness, roughness and longitudinal and transverse residual stresses were measured. As a result of the studies, there were selected parameters of shot peening, exerting the greatest influence on favourable residual stresses distribution in the surface layer of material and an increase in microhardness. At the same time, particular attention was paid to the morphology of samples surfaces after shot peening. There were rejected the parameters of shot peening, which caused damage to the surface in the form of visible cracks and craters. Based on the analysis presented in this article there were selected shot peening parameters, which will be applied during the additional dynamic surface processing of gears, used in the tractor’s drive system.
Źródło:: Journal of KONES; 2016, 23, 2; 389-395
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Using sorbents for oil spill clean-up in ports and coastal areas
Autorzy:: Kończewicz, Włodzimierz
Polasz, Sylwia
Rogowska, Kinga
Powiązania:: https://bibliotekanauki.pl/articles/950129.pdf
Data publikacji:: 2019
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: materials engineering
maritime engineering
fuel
oils
lubrication
Opis:: Petroleum substances are a mixture of many hydrocarbons of various structures; some of them are toxic for marine organisms. In case of pollution of the aquatic environment, these compounds may enter seawater organisms and adversely affect gas exchange and inhibit photosynthesis. Therefore, it is important to take measures to reduce the emissions of these compounds into the aquatic environment and quickly to remove possible spills of uncontrolled pollution. Sorbents are materials that soak up oil from water. They are best suited for the absorption of oil – derived substances. They are used to absorb leaks in open and closed tanks, particularly in hard – to-reach places. Sorbents can be natural organic, natural inorganic or synthetic. Natural sorbents are divided to organic materials such as peat moss or wood products, and inorganic materials such as vermiculite or clay. Sorbents are available in a loose form, which includes granules, powder, chunks and cubes. Synthetic sorbents are used to wipe other oil spill recovery equipment such as skimmers and booms after a spill clean-up operation. The thesis deals with the issues related to the analysis of the possibility of using sorbents to combat oil pollution in port and coastal areas. The article discusses the types of pollution occurring in coastal waters, as well as the types of sorbents used and the forces and measures to combat pollution. The characteristic features of sorbents are rate of absorption and adsorption, oil retention and ease of application. Absorption tests were carried out and the best sorbents for combating oil pollution were selected.
Źródło:: Journal of KONES; 2019, 26, 4; 113-117
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The examination of elastomeric materials used in vibroisolation and soundproof isolation systems in structural engineering
Autorzy:: Bednarz, J.
Targosz, J.
Powiązania:: https://bibliotekanauki.pl/articles/950141.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vibroisolation systems
sound-proof isolation systems
elastomeric materials
structural engineering
Opis:: Solution of the problem of limiting the spread of the dynamic and acoustic emissions from rail and road traffic requires application of new elastomeric materials are characterized by both high acoustic insulation as well as being part of vibroisolation system between the source of vibration associated with the movement of vehicles and construction engineering structure.In the new solutions of vibro- and sound-proof, isolation based on the new elastomer materials should be taken into account a strong correlation between physico-mechanical properties of these material and the values of static and dynamic load, which effect on these materials. Another problem, which is associated with the use of elastomer materials, is the influence of the volume of used item on their physico-mechanical parameters. Therefore, the use of elastomer materials in vibro- and sound-proof isolation systems requires at the stage of selecting of materials a number of studies that will allows specifying the properties of materials for a specific application. A properly conducted process of selection of materials will help to achieve the desired effect, which is to build a well-functioning vibro- and sound-proof isolation system. Without a properly conducted process of selection of materials can be achieved counterproductive result. In the paper, the results of experimental studies carried out to determine the physicomechanical elastomer material that could be used as a flexible bearing in structural engineering constructions are presented. Flexible nodes bearing can be classified as the latest generation of vibroisolation systems. The studies were also performed to assess the possibility of using such materials in sound-proof isolation in concert halls and conference rooms. In the paper, the new methodology of assessment of physico-mechanical elastomer materials that could be a standard for the design of vibro- and sound-proof isolation systems and based on such materials in the newly designed civil engineering structures.
Źródło:: Journal of KONES; 2013, 20, 4; 23-30
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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