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1
Content available A characteristic of selected properties of vulcanised rubber elements used on the “Izabel” inland vessel
Pawłowska P., Matuszak Z., Sosik K., Chovancová M.
New Trends in Production Engineering
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2018
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Vol. 1, Iss. 1
675-679
EN
Vulcanised rubber as a complex system is made from the basic component being virgin rubber and various components amounting to 10-15 per cent or even more. The material gains its most valuable properties in the final phase of processing i.e. vulcanisation. In mechanical as well as automotive engineering it is important for vulcanised rubber to be resistant to grease, oil and fuel in high operating temperatures. Being one of the very valuable isolation materials, vulcanised rubber is also characterized by dielectric and elastic properties as well as distinguished resistance to operating conditions (high/low temperature, weather conditions). All the above mentioned applications of vulcanised rubbers are also found in the shipyard industry. Their use is also very much predicated on the properties such as: ability to attenuate mechanical vibrations, high elasticity, considerable elastic deformability under static and dynamic loads, low permeability of water and gas, resistance to various chemicals, and other. The purpose of this article was to determine the hardness of vulcanised rubber samples obtained from various places on the “Izabel” inland barge. The scope of the study covered sampling and preparing the samples for testing (i.e. cleaning and degreasing the samples). Then, the hardness of the samples was measured using the Shore hardness test. The first part of the article presents the general concept of vulcanised rubber, its main components, properties, applications, and ageing. The second part focuses on the research scope and measuring the hardness of vulcanised rubber samples obtained from the “Izabel” inland barge. vulcanised rubber, hardness, ageing, wear and tear wulkanizowanej gumy, twardość, starzenie się, zużycie
2
Content available Research of individual factors affecting the engine power while a passenger car operation
Šarkan B., Stopka O., Chovancová M., Rybicka I., Kapustina L. M.
Archiwum Motoryzacji
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2018
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Vol. 82, nr 4
143--152
EN
Power of any kind of a car engine is considered to be one of the basic factors in order to choose or assess vehicles equipment or its appropriateness. It influences several operation properties including car maximum velocity, car acceleration, etc. A car producer shall issue the data about an engine power of a car in a form of its technical attributes, nevertheless an engine power specification is also stated in a car registration certificate. Engine power may be defined as the maximum engine output at given revolutions of an engine, i.e. maximum engine power. In most of cases of cars operation, various situations may occur in order to specify the maximum engine power value. This study addresses the issue of determining individual factors affecting the engine power while a passenger car in operation, i.e. testing the engine power on the single roller bench and related particular analysis.
3
Content available Lifetime prediction of propellants according to NATO standards
Chovancová M., Očko P., Pechová A., Lopuch J.
Problemy Techniki Uzbrojenia
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2006
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R. 35, z. 98
7--14
EN
This work presents the process of lifetime prediction of propellants according to new NATO standards. It shows the examples of lifetime prediction of selected nitrocellulose based propellants that are used in the ammunition of Armed Forces of Slovak republic.
4
Content available remote Flexible plastic explosives with rubber NBR during artificial ageing
Chovancová M., Očko P., Lazar M., Lisý J., Lopúch J.
Problemy Techniki Uzbrojenia
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2003
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R. 32, z. 86
13--22
EN
This paper investigates chemical and thermal stability of flexible PBX's during their artificial ageing in term of their similar plastic binder. It was documented, they contain the rubber NBR and the similar base (RDX, PETN or RDX with PETN), but they don't have equivalent behaviour during the artificial ageing. It was discovered one from them is chemically unstable, because probably the rubber NBR is incompatible with RDX.
5
Content available remote Computer modelling of fragmentation warheads effects
Očko P., Chovancová M., Lazar M., Lisý J., Miča S.
Problemy Techniki Uzbrojenia
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2003
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R. 32, z. 86
23--33
EN
In this paper is compared computer modelling of the fragmentation warhead effects in dependence of variety high explosives with practical test results. For the fragmentation modelling was used analytical code SPLI-X version 3.02. SPLIT-X is an expert system for the design of fragmentation warheads. The influence of next high explosives on fragmentatio effect was compared: cast trinitrotoluene (TNT), mixture explosives TNT/RDX/wax and insensitive HE type of the plastic bonded explosives (PBX) NTO/RDX/IB (IHE).
6
Content available remote Stability investigation of plastic explosives during their ageing process
Chovancová M., Očko P, Sevčik R., Čavojský L., Lopúch J.
Problemy Techniki Uzbrojenia
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2002
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R. 31, z. 83
17--23
EN
This elaboration investigates the ageing process influence on the stability and the mechanical properties of plastic explosives.
7
Content available remote The marke agent effect on the military explosives stability
Chovancová M., Očko P., Lopύch J., Čavojský L.
Problemy Techniki Uzbrojenia
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2001
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R. 30, z. 78
7--14
EN
This elaboration investigates how does the marking agent influence the stability of plastic explosives. It makes a judgement of both chemical and thermal stability of the marked high explosives over a last few years was relating to their composition and along with it compares their stability with the pure explosives, which is the marked explosives base.
8
Content available remote Fragmentation warheads
Očko P., Chovancová M.
Problemy Techniki Uzbrojenia
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2001
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R. 30, z. 77
7--16
EN
In this paper is compared the fragmentation effect of 100 mm HE warhead in the dependence of variety explosives. For the tests were used: cast trinitrotoluene (TNT), mixture explosives TNT/RDX/wax 47,5/50/2,5%, TNT/RDX/wax 40/59/1% (Composition B), TNT/RDX/Al/wax 40/42/15/3% and insensitive HE type of the plastic bonded explosives (PBX) NTO/RDX/IB45/38/17%.
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