20.500.12556/RUL-186961 Analiza kompozitne strukture šasije dirkalnika Formula Student po teoriji laminatov Analysis of the composite structure of a Formula Student monocoque using classical laminate theory Kompozitne sendvične strukture omogočajo izdelavo lahkih in togih šasij dirkalnikov Formula Student, vendar je njihovo konstruiranje zaradi zahtevnosti analize večslojnih struktur zahtevnejše kot pri klasičnih cevnih šasijah. Namen naloge je bil razviti programsko orodje za oceno togosti in porušne sile sendvične strukture pri tritočkovnem upogibnem obremenjevanju ter primerjavo napovedi z eksperimentalnimi meritvami. Kalkulator temelji na klasični laminatni teoriji za določitev togosti in napetostnega stanja skorje ter modelu nosilca na elastični podlagi za opis lokalne deformacije in drobljenja sredice. Vključuje štiri porušitvene kriterije, register laminatov ter samodejno primerjavo teoretičnih in eksperimentalnih rezultatov. Izvedeni so bili tritočkovni upogibni preizkusi reprezentativnih vzorcev sendvičnih struktur. Rezultati so pokazali, da model relativno natančno napove togost, medtem ko porušno silo konsistentno podcenjuje z majhnim odstopanjem. Podajnost preizkusne naprave ima zanemarljiv vpliv. Kalkulator je primeren za začetno oceno lastnosti struktur, vendar ne more nadomestiti eksperimentalnega preverjanja. Composite sandwich structures enable the development of lightweight and stiff chassis for Formula Student race cars; however, their design is more demanding than that of conventional tubular chassis due to the complexity of multilayer structural analysis. The aim of this thesis was to develop a software tool for estimating the stiffness and failure load of sandwich structures under three-point bending and comparing the predictions with experimental measurements. The calculator is based on classical laminate theory to determine the stiffness and stress state of the skins and on an elastic foundation beam model to describe local deformation and core crushing. It includes four failure criteria, a laminate database, and automatic comparison of theoretical predictions with experimental results. Representative sandwich specimens were manufactured and tested under three-point bending. The results showed that the model predicts structural stiffness with relatively good accuracy, while consistently underestimating the failure load with small deviations. Test-rig compliance has a negligible influence on the deviations. The calculator is suitable for preliminary structural assessment but cannot replace experimental validation. kompozitna sendvič struktura klasična laminatna teorija Winklerjev model podlage tritočkovni upogib Formula Student composite sandwich structure classical laminate theory Winkler foundation model three-point bending Formula Student true false true [J. Kastelec] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-08 08:30:35 2026-09-08 08:30:42 2026-09-09 04:22:04 0000-00-00 00:00:00 2026 0 Ljubljana 0 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 629.331:678.067(043.2) 289565 290342403 49008.pdf 49008.pdf 1 0973BB4F1EBB0D0476BA41432DD25B88 54c9d7a2d987f8e727e47306ea1710bcdbc60ec1440530af5817147a99d61e0c cee4e8c7-ab4e-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246368 Fakulteta za strojništvo 0 0 0