magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Rok Šmerc (Author), Miroslav Halilovič (Mentor)

Abstract

Princip delovanja mikrostikal temelji na geometrijsko nelinearnem mehanskem odzivu, saj se preklop električnih kontaktov, s čimer se sklene ali prekine električni krog, zgodi zaradi preskoka sistema notranjega kovinskega mehanizma mikrostikala. V magistrskem delu so predstavljeni teoretično ozadje in pristopi pri obravnavi mehanskega odziva geometrijsko nelinearnih konstrukcij z uporabo metode končnih elementov. Prikazana je izpeljava formulacije geometrijsko nelinearnih končnih elementov za reševanje linijskih konstrukcij in njihova implementacija v lastno razviti program v programskem okolju Wolfram Mathematica. Pravilnost delovanja je preverjena z analitično rešljivimi primeri. S programom je izvedena analiza delovanja kovinskega mehanizma mikrostikala. Prikazan je proces prednapetja pločevine, iz katere je mehanizem izdelan, nato pa je izvedena analiza vpliva različnih stopenj prednapetja na delovanje mehanizma.

Keywords

magistrske naloge;numerično modeliranje;metoda končnih elementov;geometrijska nelinearnost;mehanski odziv;preskok sistema;linijske konstrukcije;mikrostikala;ko-rotacijska formulacija;Wolfram Mathematica;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [R. Šmerc]
UDC: 621.316.54:004.942.519.61(043.2)
COBISS: 16929051 Link will open in a new window
Views: 615
Downloads: 199
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Other data

Secondary language: English
Secondary title: Numerical modelling of geometrically nonlinear mechanical response of a micro-switch
Secondary abstract: Working principle of micro-switches is based on geometrically nonlinear mechanical response, since the switch of electrical contacts, whereby the electrical circuit is connected or interrupted, occurs due to the snap-through of the inner metal mechanism of the micro-switch. The master's thesis introduces theoretical background and approaches when discussing the mechanical response of the geometrically nonlinear structures by applying the finite element method. The derivation of the formulation of geometrically nonlinear finite elements to solve frame structures is introduced, as well as their implementation in the own developed program in the software environment Wolfram Mathematica. The correct functioning is examined with analytically solvable examples. The function analysis of the metal mechanism of the micro-switch is carried out with the program. The process of prestressing the metal sheet, from which the mechanism is made is shown, and then the analysis of different levels of prestress on the mechanismʼs functioning is carried out.
Secondary keywords: numerical modelling;finite element method;geometric nonlinearity;mechanical response;snap-through;frame structures;micro-switches;co-rotational formulation;Wolfram Mathematica;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXVIII, 73 str.
ID: 11217807
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