The main aim of this paper is to find if it is possible to identify material parameters using only three force-displacement dependencies, each for a different angle between the loading force and the principal material directions. The tested materials are textiles made of epoxy resin and fibers in the form of a glass plain weave, a glass quasi-unidirectional weave, a carbon plain weave, a carbon quasi-unidirectional weave, an aramid plain weave and an aramid quasi-unidirectional weave. The plain weave has theoretically 50 % of the fibers in the first and 50 % in the second principal material direction. The quasi-unidirectional weave has theoretically 90 % of the fibers in the first and 10 % in the second principal material direction. Seven types of specimens for each material were subjected to experimental tests. The first principal material direction of each material forms an angle between 0°and 90°with a step of 15°with the applied loading force. The results show that it is possible to identify the material parameters with sufficient accuracy using only three force-displacement dependencies for five out of six materials. Keywords: textile composite, cyclic tensile test, material parameters, plasticity, weave locking, identification, optimization Namen~lanka je preiskava mo`nosti ugotavljanja parametrov materiala z uporabo samo treh odvisnosti sila-raztezek pri razli~nem kotu med silo obremenjevanja in glavno smerjo materiala. Preiskovani materiali so tekstil, izdelan iz epoksi smole in vlaken v obliki platnene vezave, kvazi usmerjene vezave, ogljikove platnene vezave, ogljikove kvazi usmerjene vezave, aramidne platnene vezave in aramidne kvazi usmerjene vezave. Platnena vezava ima teoreti~no 50 % vlaken v prvi in 50 % v drugi prednostni smeri usmerjenosti materiala. Kvazi usmerjena vezava ima teoreti~no 90 % v prvi in 10 % v drugi prednostni smeri usmerjenosti materiala. Sedem vrst vzorcev vsakega materiala je bilo preverjeno s preizkusi. Prva glavna usmerjenost pri vseh materialih je bila pod kotom med 0°in 90°s koraki po 15°glede na delovanje sile. Rezultati ka`ejo, da je bilo mogo~e dovolj zanesljivo ugotoviti parametre materiala samo z uporabo treh odvisnosti sila-raztezek pri petih od {estih uporabljenih materialih.

The presented work is focused on an experimental investigation of the behavior of six types of textile composites subjected to pure tensile, cyclic tensile and compressive loading according to ASTM standards. Each type was loaded in directions forming angles between 0°and 90°, with a step of 15°with respect to the reference directions of the weaves. Two types of woven fabrics were tested (plain and quasi-unidirectional plain-woven fabric). Images of specimens taken during the tests were subsequently used for the calculation of the so-called locking angle of yarns (bundles) just before failure. Force-displacement dependencies were recorded during the tensile tests. Ultimate forces were obtained from the compressive tests. The second half of the article is dedicated to the analysis of the experimental data gathered with nearly 1000 experiments. Special software for automatic calculation of averaged dependencies, maximum forces and maximum displacements was created. Furthermore, the methodology for calculating the locking angle was proposed and tested. The obtained results will be used for the identification of the material parameters of the proposed material model in the following research. Keywords: textile composites, woven fabric, tensile test, compressive test, result analysis, weave locking Prispevek je usmerjen v eksperimentalno preiskavo obna{anja {estih vrst tekstilnih kompozitov, obremenjenih z natezno, cikli~no-natezno in tla~no obremenitvijo skladno z ASTM standardi. Vsaka vrsta je bila obremenjena v smeri, ki je tvorila kot med 0°in 90°, s koraki po 15°, glede na smer tkanja. Preizku{eni sta bili dve vrsti tkanin (obi~ajna in kvazi enosmerna obi~ajna tkanina). Posnetki vzorcev med preizkusi so bili uporabljeni za izra~un zapornega kota preje (sve`njev) tik pred poru{itvijo. Odvisnosti sila-raztezek so bile posnete med nateznimi preizkusi. Kon~ne sile so bile dobljene iz tla~nih preizkusov. Naslednji del prispevka je bil posve~en analizi eksperimentalnih podatkov iz skoraj 1000 preizkusov. Kreirana je bila posebna programska oprema za avtomatsko ra~unanje povpre~nih odvisnosti: maksimalnih sil in maksimalnih raztezkov. Poleg tega je bila predlagana in preizku{ena metodologija za izra~un zapornega kota. Dobljeni rezultati bodo uporabljeni pri nadaljevanju raziskav za dolo~anje parametrov materiala v predlaganem modelu materiala.