Browsing by Author "Herclík, Miroslav"
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- ItemFire-Resistant Sandwich-Structured Composite Material Based on Alternative Materials and Its Physical and Mechanical Properties(2019-05-02) Hýsek, Štěpán; Frydrych, Miroslav; Herclík, Miroslav; Louda, Petr; Fridrichová, Ludmila; Van, Su Le; Chi, Hiep LeThe development of composite materials from alternative raw materials, and the design of their properties for the intended purpose is an integral part of the rational management of raw materials and waste recycling. The submitted paper comprehensively assesses the physical and mechanical properties of sandwich composite material made from particles of winter rapeseed stalks, geopolymer and reinforcing basalt lattices. The developed composite panel is designed for use as a filler in constructions (building or building joinery). The observed properties were: bending characteristics, internal bonding, thermal conductivity coefficient and combustion characteristics. The results showed that the density of the particleboard has a significant effect on the resulting mechanical properties of the entire sandwich panel. On the contrary, the density of the second layer of the sandwich panel, geopolymer, did not have the same influence on its mechanical properties as the density of the particleboard. The basalt fibre reinforcement lattice positively affected the mechanical properties of sandwich composites only if it was sufficiently embedded in the structure of the particle board. All of the manufactured sandwich composites resisted flame for more than 13 min and the fire resistance was positively affected by the density of the geopolymer layer.
- ItemHodnocení vzhledového defektu(zlomu - vrásky)na textilii použitím principu cyklického mačkání textilie(2016-03-30) Herclík, Miroslav; Fridrichová Ludmila, doc. Ing. Ph.D.; Skolitel : 64111 Ducháčková Eva, prof. Ing. CSc.; Konzultant : 63774 Semerádová Tereza, Mgr. Ph.D.; Konzultant2 : 65182 Kotýnková EvaCílem této práce je navrhnout a vyrobit jednoduchý přístroj pro hodnocení zlomové vrásky na textilii určené pro potah automobilových sedaček. Touto zlomovou vráskou se rozumí vzhledový defekt na povrchu textilie, který se negativně podepisuje na výsledné kvalitě autopotahu. Pro tento přístroj je navržena vhodná metodika pro měření a samotné vyhodnocení, která je postavena na principu cyklického mačkání testovaného vzorku. Konstrukce přístroje vychází z informací obsažených v rešeršní části práce, kde jsou popsány některé dosud užívané metody a přístroje pro hodnocení ohybového chování textilie, především ohybové tuhosti a deformačního úhlu. Přístroj je doplněn výkresovou dokumentací vytvořenou v CAD programovém prostředí. Veškerá měření jsou díky snímací kameře zaznamenána a následně uložena na přiloženém DVD nosiči.
- ItemImpact of Flax and Basalt Fibre Reinforcement on Selected Properties of Geopolymer Composites(MDPI, 2020-01-06) Frydrych, Miroslav; Hýsek, Štěpán; Fridrichová, Ludmila; Van, Su Le; Herclík, Miroslav; Pechočiaková, Miroslava; Chi, Hiep Le; Louda, PetrThe submitted paper deals with the physical and mechanical properties of geopolymer composite materials reinforced with natural fibres. For this study, we aimed to develop a geopolymer composite reinforced with long flax fibres, which were implemented in the geopolymer in the form of a nonwoven fabric that reinforced the structure of the geopolymer over the entire thickness of the board. In order to compare the properties of the developed composite with natural fibres, a geopolymer without fibres and a geopolymer reinforced with basalt fibres were also produced. The monitored mechanical properties were impact bending, bending strength and compressive strength. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and microscopic analysis were also carried out. The results clearly showed the positive effect of the addition of natural fibres on impact bending and bending strength. However, the addition of natural fibres in the form of a nonwoven fabric significantly increased the variability of the properties of the developed composites. In addition, a different pattern of joint failure was noted between geopolymer reinforced with flax fibres and geopolymer reinforced with basalt fibres.
- ItemNanofibrous Membrane as a Moisture Barrier(2018-01-01) Fridrichová, Ludmila; Frydrych, Miroslav; Herclík, Miroslav; Knížek, Roman; Mayerová, KarolínaThe text of the paper deals with the unusual use of textile membrane, originally used in outdoor clothing, as hydrobariers in building composites. In the experiment, the resistance of the building composite exposed to the 1.5 m high water column is examined. Research is conducted on two levels. On the first level, we focus on developing a building composite that includes a smart fabric membrane and is waterproof and vapour-permeable. On the second level, we deal with the development of a measuring system which will be able to correctly evaluate the water resistance of the building composite. A moisture-proof and air-permeable membrane can protect construction against various effects of moisture (i.e. flood, rain, ground water). The resulting water permeability values are compared with the four types of construction composite. It is discussed whether it is possible to create hydrobarriers in buildings if a textile nanofibrous membrane is composed into the building composite. If the composite is able to capture 70-80% of the water then the energy savings are significant.
- ItemPermeable water-resistant heat insulation panel based on recycled materials and its physical and mechanical properties(MDPI, 2019-01-01) Hýsek, Štěpán; Frydrych, Miroslav; Herclík, Miroslav; Fridrichová, Ludmila; Louda, Petr; Knížek, Roman; Van, Su Le; Chi, Hiep Le: This paper deals with the development and characteristics of the properties of a permeable water-resistant heat insulation panel based on recycled materials. The insulation panel consists of a thermal insulation core of recycled soft polyurethane foam and winter wheat husk, a layer of geopolymer that gives the entire sandwich composite strength and fire resistance, and a nanofibrous membrane that permits water vapor permeability, but not water in liquid form. The observed properties are the thermal conductivity coefficient, volumetric heat capacity, fire resistance, resistance to long-term exposure of a water column, and the tensile strength perpendicular to the plane of the board. The results showed that while the addition of husk to the thermal insulation core does not significantly impair its thermal insulation properties, the tensile strength perpendicular to the plane of these boards was impaired by the addition of husk. The geopolymer layer increased the fire resistance of the panel for up to 13 min, and the implementation of the nanofibrous membrane resulted in a water flow of 154 cm2 in the amount of 486 g of water per 24 h at a water column height of 0.8 m.
- ItemRenovace vozidla značky Velorex vhodnou koženkouHerclík, Miroslav
- ItemRenovace vozidla značky Velorex vhodnou koženkou(2014-10-24) Herclík, Miroslav; Štočková Hana, Ing.; Skolitel : 54781 Antlová Klára, doc. Ing. Ph.D.; Konzultant : 62900 Kolek Ondřej, Ing. Ph.D.; Konzultant2 : 64418 Stanley Olga, Mgr.Cílem této bakalářské práce je výběr vhodného dodavatele kompletní sady čalouněných dílů pro renovaci vozidla značky Velorex. V práci je shrnuta historie tohoto vozidla a charakteristika obvyklých textilních materiálů užívaných pro renovaci. Z materiálů popisovaných v této práci je věnována největší pozornost plastické kůži (kožence). Dalšími uvedenými materiály jsou Betexin, Kortexin a střechovice. U těchto plošných textilií je provedeno měření mechanických vlastností a na základě výsledků měření s ohledem na ekonomické ukazatele jsou vybrány nejvhodnější textilie pro renovaci. U zmíněných materiálů je provedeno měření pevnosti a tažnosti, odolnosti v oděru, prodyšnosti, plošné hmotnosti a tloušťky. Součástí práce je stručný popis postupu upevňování plošných textilii na trubkovou konstrukci vozidla.