Numeričko modeliranje oštećenja sendvič konstrukcija pri savijanju

master's thesis

• Title (english): Numerical modelling of damage in sandwich structures under bending load
• Author: Ivan Kovačević
• Mentor: Darko Ivančević (mentor)
• Committee member: Milan Vrdoljak (predsjednik povjerenstva)
• Committee member: Josip Stepanić (član povjerenstva)
• Committee member: Darko Ivančević (član povjerenstva)
• Committee member: Zoran Lulić (član povjerenstva)
• Committee member: Milan Vujanović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2018-12-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

Provedena je numerička analiza oštećenja i popuštanja sendvič konstrukcije do kojih dolazi pri savijanju. Vanjski slojevi sendvič konstrukcije napravljeni su od ugljik/epoksi materijala, a jezgra od aluminija. Modeliranje sendvič konstrukcije korištena su dva pristupa - homogenizirani i saćasti. U saćastom pristupu u obzir se uzela detaljna geometrija jezgre. Za homogenizirani model koristila su se ekvivalentna elastična svojstva izračunata prema dostupnoj literaturi. Rezultati homogeniziranog i saćastog modela su međusobno uspoređeni te su uspoređeni s eksperimentalnim rezultatima dobivenim prilikom testa savijanja u tri točke iz literature \cite{ClanakValidacija}. Popuštanje vanjskih slojeva konstrukcije analizirano je korištenjem Hashinovog kriterija popuštanja dok je popuštanje jezgre analizirano usporedbom naprezanja s granicom elastičnosti.

Abstract (english)

Numerical analysis of damage in sandwich structures under bending load was performed in this work. Sandwich structure was made of carbon/epoxy facesheets and aluminum honeycomb core. Two approaches for core modelling were used in this work - homogenized approach and honeycomb approach. Equivalent elastic properties of the core were determined according to given literature. Results of both models were compared. Also, results of each model were compared to experimental results that have been aquired during three point bending test. Facesheet damage and failure were modeled using Hashin criterion while core damage and failure was assessed using the critical value of equivalent plastic strain.

• Keywords: Popuštanje sendvič konstrukcije; saćasti model; homogenizirani model; numerička analiza; test savijanja u tri točke
• Keywords (english): Failure of Sandwich Structure; Honeycomb Model; Homogenized Model; Numerical Analysis; Three Point Bending Test
• Language: croatian
• URN:NBN: urn:nbn:hr:235:759513
• Study programme: Title: Aeronautical Studies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva (magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-28 09:46:54