21 KB197 KB15 KB200020242008Kroupa, TomášLaš, Vladislavštevilka:3letnik:42str. 125-129ISSN:1580-2949COBISSID:678826URN:URN:NBN:SI:doc-KWCWOPOCenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijekompozitinatezni preizkusnelinearnostogljik-epoksiThe off-axis behavior of a unidirectional fiber-reinforced plastic composite| Zunajosno obnašanje enosmernih z vlakni ojačenih plastičnih kompozitov|Numerical and experimental investigations of the off-axis behavior of a unidirectional fiber-reinforced plastic composite consisting of carbon fibers and an epoxy matrix are presented. Static tensile tests of thin carbon-epoxy composite strips with various fiber directions were performed and simulated using a finite-element program. Pack's action-plane concept (failure criterion) and progressive failure analysis were used for the damage prediction of the tested thin strips. A non-linear stress-strain relation was used for modeling the off-axis behavior. The relation between the tensile force and the displacement in the direction of the loading force and the ultimate tensile force, which caused damage and the ultimate displacement of specimens, were measured and compared with the results of the numerical simulation. The fiber directions of the specimens, measured from the directionof loading, were in the interval 0compositum-90compositum. Good agreement between the experimental results and the numerical simulations was achieved. The non-linear stress-strain relation was verified for the case of along-fiber carbon-epoxy composite loaded with a static tensile loading forcePredstavljeni so rezultati laboratorijske in numerične raziskave zunajosnega obnašanja enosmernih laminatov iz ogljikovih vlaken in epoksi matice. Izvršeni so bili statični preizkusi tankih kompozitnih lamel z različno smerjo vlaken in simulirani z uporabo metode končnih elementov za napoved pojava poškodbe preizkusnih tankih lamel. Nelinearen odnos napetost deformacija je bil uporabljen za modeliranje zunaj osnega obnašanja. Določeno je bilo razmerje med natezno silo in premikom v smeri obremenitve in končna natezna sila, ki je povzročila poškodbo ter končni premik in oboje je bilo primerjano z rezultati numerične simulacije. Kot med smerjo vlaken v vzorcih in med smerjo obremenitve je bil med 0kompozitum in 90kompozitum. Doseženo je bilo dobro ujemanje med eksperimentalnimi rezultati in rezultati simulacije. Nelinearen odnos napetost deformacija je bil preverjen za primer dolgovlaknatih ogljik-epoksi kompozitov, obremenjenih s statično siloTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije