15 KB192 KB12 KB200020242012Kroupa, TomášSrbová, HanaZemčík, Robertletnik:46številka:5str. 431-434ISSN:1580-2949COBISSID:940202URN:URN:NBN:SI:doc-0QWZP6QEenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijecelica enoteenosmerni vlaknati kompozitfunkcija deformacijske utrditve maticeidentificationidentifikacijamatrix work-hardening functionmicromodelmikromodelnelinearno vedenjenon-linear behavioroptimizacijaoptimizationrepresentative volume elementreprezentančni element volumnaunidirectional fiber compositeunit cellIdentification of the material parameters of a unidirectional fiber composite using a micromodel| Identifikacija parametrov materiala enosmernega kompozita z uporabo mikromodela|The paper is focused on the identification of material parameters of the substituents of an unidirectional carbon-epoxy long-fiber-reinforced composite. Simple tensile tests using thin coupons with various fiber orientations were performed and force-displacement diagrams were obtained. A model of a unit cell is created in MSC.Marc. Fibers are considered to form a non-linear, elastic, transversely isotropic material and the matrix is considered to be an elasto-plastic isotropic material. The unit cell is loaded by a uniaxial stress up to the same level of loadings as the experimental samples. The sum of the squared differences of displacements between the numerically and experimentally obtained force-displacement diagrams is minimized within an identification process. The parameters of the linear relation between the Young's modulus of fibers and strain in the fiber-axis direction, and three shape coefficients of the matrix work-hardening function are searched. The identification process is performed using the MSC.Marc, OptiSlang optimization software and MatlabCilj dela je bila identifikacija parametrov materiala za nadomestek pri enosmernem ogljik-epoksi dolgovlaknatem ojačenem kompozitu. Enostavni raztržni preizkusi z uporabo odrezkov z različno orientacijo vlaken so bili izvršeni in dobljeni so bili diagrami sila - pomik. Model z enotno celico je bil ustvarjen v MSC.Marc. Vlakna so bila upoštevana kot nelinearen elastičen, prečno izotropen material, matica pa je bila upoštevana kot elastoplastičen izotropen material. Vsota kvadratov razlik v pomiku med numerično in eksperimetalano doseženimi diagrami sila - deformacija je bila minimalizirana z identifikacijskim procesom. Iskani so bili parametri linearne odvisnosti med Young modulom vlaken in deformacijo v smeri osi vlaken ter trije oblikovni koeficienti za deformacijsko utrditev matice. Proces identifikacije je bil izvršen z uporabo MSC.Marc, OptiSlang-softvera za optimizacijo in MatlabaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije