magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Aleš Durjava (Author), Domen Šeruga (Mentor), Marko Nagode (Co-mentor)

Abstract

Magistrska naloga obravnava fenomen pojava spominskih pravil. Razumevanje cikličnega obnašanja v napetostno-deformacijskem prostoru temelji na desetletjih preizkusov kovinskih materialov. Polimeri v zadnjem času doživljajo hiter preboj na številnih področjih tudi kot alternativa kovinskim gradivom. Cilj naloge je preveritev, ali že znana teorija spominskih pravil velja tudi za polimere, ki se na mikroskopski ravni razlikujejo od kovin. Zaradi splošne uporabnosti smo se osredotočili na poliamide, natančneje poliamid 6 in poliamid 66 s 30 % stekla. Z enoosnimi preizkusi in analizo rezultatov smo ugotovili, da se poliamidi v splošnem ravnajo po spominskih pravilih, neodvisno od prisotnosti steklenih vlaken. Dodatek steklenih vlaken kvečjemu pripomore k manjšemu raztrosu med vzorci, izboljšani trdnosti in togosti. Dokazali smo tudi, da je napetostno-deformacijski odziv možno precej natančno simulirati s kombinacijo izotropnega in kinematičnega utrjevanja, definiranega po Armstrong – Frederickovem zakonu.

Keywords

magistrske naloge;obratovalna trdnost;polimeri;poliamidi;spominska pravila;simulacije;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [A. Durjava]
UDC: 539.3:678.7(043.2)
COBISS: 147895043 Link will open in a new window
Views: 306
Downloads: 54
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Other data

Secondary language: English
Secondary title: Occurrence of memory rules during the cyclic stress-strain response of polymeric materials
Secondary abstract: Masters thesis focuses on memory rules. Understanding of cyclic stress strain behaviour is based on former research that was mostly done with metals. Polymer breakthrough is becoming more prominent, as they are already beeing used as substitute for metals. The main goal of this work is confirmation that current known theory of memory rules does also apply for polymers. Because of general usefulness we focused on Polyamide group, more exactly we conducted resarch with Polyamide 6 and Polyamide 66 with 30% glass reinforcement. With uniaxial tests and extensive data analysis, we concluded that Polyamides in general do abide memory rules and the phenomenon is not dependant on presence of reinforcement fobers. Added reinforcements decreased variation between samples but also significantly improved strenght and stiffnes. We also proved that stress-strain response can be fairly accurately simulated with combined model of isotropic and kinematic hardening defined with Armstrong Frederick rule.
Secondary keywords: master thesis;cycle fatigue;polimers;polyamides;Simulations;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XX, 55 str.
ID: 18445159
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