Vpliv parametrov izdelave sendvič plošč iz ogljikovih vlaken in lahkega polnila v avtoklavu

diplomsko delo Visokošolskega strokovnega študijskega programa I. stopnje Strojništvo

Timotej Hofbauer (Author), Roman Šturm (Mentor), Zoran Bergant (Co-mentor)

Abstract

V diplomskem delu smo naredili pregled literature o kompozitih, laminatih in lahkih sendvič panelih. Raziskali smo tri tehnološke postopke izdelave lahkih strukturnih sendvič plošč in njihov vpliv na kakovost izdelave. Ugotavljali smo vplive parametrov izdelave na upogibno trdnost in debelino sendvič kompozita. Testiranje je potekalo z dvema materialoma polnila, peno in satjem, obdana z enoslojno prepreg (pred-impregnirano) tkanino iz ogljikovih vlaken na vsaki strani. Iz posamezne serije plošč so bili izrezani standardni vzorci katere smo stehtali, premerili in stestirani s tritočkovnim upogibnim preizkusom. Ugotovili smo, da se v območju med 0 in 5 barov delovnega tlaka v avtoklavu postopno zmanjšuje debelina sendvič plošče. Še posebej izrazito se je to pokazalo pri vzorcih iz pene, ki ima slabšo tlačno trdnost od satja. Po drugi strani pa smo ugotovili manjši padec debeline z naraščanjem tlaka pri vzorcih iz satja, v tem primeru je porušitev sledila šele pri najvišjih tlakih. Na upogibnem preizkusu se je najbolje obnesel vzorec iz satja pri tlaku 2 barov, najslabše pa sta se obnesla vzorca izdelana, sicer z zelo pogosto uporabljenim postopkom v industriji, naknadnim lepljenjem. Vzorci iz satja so dosegli tudi največje razmerje med maksimalno napetostjo in težo. Z mikroskopiranjem smo nato želeli rezultate dodatno ovrednotiti in ugotovili, da je je najbolj dominantna porušitev pri vzorcih, ki so lepljeni naknadno, delaminacija, pri ostalih pa kombinacija porušitve sredice in prekinitev vlaken pod točko obremenitve zaradi uklona na tlačni strani.

Keywords

diplomske naloge;kompoziti;ogljikova vlakna;lahka polnila;pred-impregnirana vlakna;sendvič konstrukcije;tri-točkovni upogibni preizkus;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[T. Hofbauer ]
UDC:	624.073:677.5:620.174(043.2)
COBISS:	61169411
Views:	855
Downloads:	107
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of carbon fiber and light filling on manufacturing parameters of sandwich panels in autoclave
Secondary abstract:	In the thesis we have reviewed the literature on composites, laminates and light sandwich panels. We learned about three processes of making a very light structural sandwich panels, which we later used in the research with the desire to optimize the manufacturing process. With different parameters we wanted to observe the impact on bending strength and thickness. The testing was carried out with two core materials, foam and honeycomb, surrounded by a single-layer prepreg carbon fibre fabric on each side. Standard samples were cut out of each series of plates, which were weighed, measured and tested with a three-point bending test. We found that in the range of 0 to 5 bar working pressure in the autoclave gradually reduces the thickness of the sandwich plate. This was particularly pronounced in the samples of foam, which has a less compressive strength than a honeycomb. On the other hand, we found a slight decrease in thickness with an increase in pressure in honeycomb samples, in which case the failure was followed only at the highest pressures. The bending test results were the best of honeycomb at a pressure of 2 bar, and the worst was the panel produced, otherwise with a very commonly used industry process, subsequent gluing. Honeycomb samples also achieved the maximum ratio of bend strength compared to weight. With microscopy, we then wanted to further evaluate the results and found that the most dominant failure in samples glued afterwards is delamination, while in others the combination of core failure and the break of the fibres below the load point.
Secondary keywords:	thesis;composites;carbon fiber;light sandwich materials;pre-preg;composite sandwich panels;three-point bend test;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XXII, 53 str.
ID:	12783224