Browsing by Author "Frydrych, Miroslav"

Now showing 1 - 8 of 8
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    Fire-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 Le
    The 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.
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    Hodnocení vzhledového defektu (zlomu vrásky) na textilii použitím principu ohýbání do smyčky
    (2016-03-30) Frydrych, Miroslav; Fridrichová Ludmila, doc. Ing. Ph.D.; Skolitel : 54965 Jáč Ivan, prof. Ing. CSc.; Konzultant : 55170 Nemčoková Renáta, Ing.; Konzultant2 : 64398 Slovinský Milan
    ANOTACEV předložené diplomové práci je řešena problematika hodnocení vzhledového defektu, kterým je vráska vznikající na potahu automobilové sedačky. Dosud užívané metody hodnocení zlomových vrásek na textiliích se jeví jako nedostačující, a proto je cílem diplomové práce navrhnout a vyrobit funkční přístroj pro jejich hodnocení a ověřit princip fungování zařízení na textiliích dodaných firmou ŠKODA AUTO a.s. Zkonstruované měřící zařízení slouží k určení, zda je testovaná textilie vhodná pro výrobu potahu automobilové sedačky. Hodnocení vzhledového defektu je založeno na principu ohýbání testovaného materiálu do smyčky. Návrh měřicího zařízení je doplněn o výkresovou dokumentací vytvořenou v CAD programovém prostředí.
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    Impact 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, Petr
    The 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.
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    Nanofibrous Membrane as a Moisture Barrier
    (2018-01-01) Fridrichová, Ludmila; Frydrych, Miroslav; Herclík, Miroslav; Knížek, Roman; Mayerová, Karolína
    The 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.
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    Permeable 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.
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    Rybářské vlasce a šňůry
    Frydrych, Miroslav
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    Rybářské vlasce a šňůry
    (2014-10-24) Frydrych, Miroslav; Štočková Hana, Ing.; Skolitel : 55316 Simová Jozefína, doc. Ing. Ph.D.; Konzultant : 59426 Švarc Petr, Ing.; Konzultant2 : 63816 Tvrzník Břetislav
    Cílem této bakalářské práce je přeměření pevnosti a průměru u pěti vybraných vzorků rybářských vlasců a porovnání těchto hodnot s hodnotami deklarovanými. Dále jsou u těchto vzorků přeměřeny i další, pro rybářské vlasce důležité, vlastnosti, jako je například odolnost v oděru a tažnost. V práci je také popsán vybraný sortiment textilního zboží, který se používá při rybolovu, jako jsou například různé druhy rybářských sítí a rybářské pletené šňůry. V práci je také shrnuta i samotná výroba rybářského vlasce. Na základě naměřených hodnot pevnosti a tažnosti, odolnosti v oděru a průměru jednotlivých vzorků je vybrán nejvhodnější materiál v porovnání s materiály konkurenčními.
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    Výroba přírub z PESL injektováním
    (1976-01-01) Frydrych, Miroslav