poševni upogib ravnega kompozitnega nosilca

Prevc, Matic (author), Brojan, Miha (mentor), Videnič, Tomaž (co-mentor)

V diplomskem delu sem obravnaval problem poševnega upogiba ravnega kompozitnega nosilca. V teoretičnem delu je najprej podana izpeljava čistega upogiba, ki ji sledi še izpeljava poševnega upogiba. Pri obeh upogibih sem izpeljal tudi enačbo upogibnice. Pri poševnem upogibu dobimo poves s superpozicijo povesov v glavnih smereh. Prav tako so predstavljene vrste kompozitnega materiala in njegove lastnosti. Predstavljena in izpeljana je metoda transformiranega preseka, s katero sem si pomagal pri izračunih. Pri računskem delu sem obravnaval troslojni kompozit, sestavljen iz dveh plasti ogljikovih vlaken in sredice iz steklenih vlaken. Izračunal sem napetosti v kritičnih točkah kompozita in povese pri različnih velikostih in kotih obremenitve. Dobljene rezultate sem primerjal z rezultati, ki sem jih dobil pri jeklenem nosilcu istih dimenzij. Ugotovil sem, da so napetosti in povesi pri jeklu sicer manjši kot pri obravnavanem kompozitnem nosilcu, vendar je prednost kompozitnega nosilca njegova masa, saj je le-ta precej manjša kot pri jeklu. Kompozitni material se zato uporablja tam, kjer potrebujemo močno in čim lažjo konstrukcijo, na primer v letalstvu, športnih rekvizitih...

• Language: Slovenian
• Keywords: upogib, poševni upogib, kompozitni material, upogibnica, metoda transformiranega preseka
• Work type: Bachelor thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95515
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: nonsymmetric bending of straight composite beams

Abstract

The diploma thesis deals with the problem of nonsymmetric bending of a straight composite beam. The theoretical part of the thesis deals with the pure bending and the nonsymmetric bending. The deflection equations were derived for both types of bending. For nonsymmetric bending, the result is obtained with the superposition of deformation in principal directions. In addition to this, the types of composite material and their characteristics are presented. The transformed-section method is presented and used in our calculations. In the computational part of the thesis, a three-layer composite made from two outer layers of carbon fibres and a layer of glass fibres in the middle was analysed. The calculations of the strain in critical points of the composite were calculated. The results were compared to calculations for a steel beam of the same dimensions. The findings show that deformations of a steel beam are smaller than that of a composite beam, but the advantage of the composite beam is in its mass, which is considerably smaller than the mass of the steel one. That is why the composite material is used everywhere, where a strong but as light as possible construction is needed, for example in aviation, sport equipment…

• Keywords: bending, nonsymmetric bending, composite material, curvature, transformed-section method