Definition of the main features of material assemblies for thermal protective clothing during external high-temperature effect modelling

Abstract

A computational-experimental method of material selection for thermal protective clothing design is proposed in this article. The intended operating temperature of the garment lies within the range of 40-170°С. The prerequisite for the research was the lack of information regarding changes in the physical-mechanical and ergonomic characteristics of material assemblies during their use under high-temperature conditions. During the initial stage of research, there was a problem associated with the selection of the most important and the exclusion of the least significant indicators, in order to further reduce the number of experimental tests in laboratory and industrial conditions. The authors used the method of expert evaluations to solve the problems related to the selection of the most significant indicators for material assemblies. Material assemblies were formed by varying the combinations of heat-resistant, heat-insulation and lining layers of materials. Initial information for the proposed method was obtained from the experimental tests of sixteen material assemblies. According to the results of the ranking, the main parameters of material assemblies were identified as follows: the temperature range for which the use of clothing is intended, thickness, mass per unit density, rupture resistance, relative tearing elongation, change in linear dimensions during mechanical loads, air permeability and change in assembly thickness during cyclic loads. It was established that the assembly that includes heat-resistant material of the Nomex comfort N.307 220 top, Nomex Serie 100 heat-insulation lining and Nomex TER 135 lining provides the necessary level of protection, reliability and ergonomics, and meets cost requirements.

V članku je predlagana računsko-eksperimentalna metoda izbire materialov za oblikovanje toplotnozaščitnih oblačil v predvidenem temperaturnem okolju 40-170°С. Informacije o spremembi fizikalno-mehanskih in ergonomskih lastnosti kompletov materialov pod vplivom visokotemperaturnih učinkov, ki so bile potrebne za raziskavo, niso bile poznane. V začetni fazi raziskave je bilo treba določiti najpomembnejše in izključiti najmanj vplivne kazalnike, kar je omogočilo nadaljnje zmanjševanje števila eksperimentalnih testov v laboratorijskih in industrijskih razmerah. Avtorji so z metodo ekspertnih evalvacij odpravili probleme, povezane z izbiro najpomembnejših kazalnikov kompletov materialov. Kompleti materialov so bili oblikovani s kombiniranjem toplotnoodpornih in toplotnoizolativnih materialov in materialov za podloge. Vhodne informacije za predlagano metodo so pridobili z eksperimentalnimi meritvami šestnajstih kompletov materialov. Glede na rezultate razvrstitve so bili opredeljeni bistveni parametri priprave kompletov materialov, in sicer temperaturno območje, za katero je namenjena raba oblačila, debelina, ploščinska masa, odpornost proti trganju, relativno raztezanje pri trganju, sprememba dimenzij med mehanskim obremenjevanjem, zračna prepustnost in sprememba debeline kompleta pri cikličnih obremenitvah. Ugotovljeno je bilo, da potrebno raven zaščite, zanesljivosti, ergonomije in stroškov zagotavlja komplet, ki je vseboval toplotno odporen material Nomex comfort N.307 220, toplotno izolativno plast Nomex Serie 100 in podlogo Nizdelan TER 135.