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Interkonverzija materialnih funkcij viskoelastičnih materialov = [Interconversion of the viscoelastic material functions] : doktorsko deloCvelbar, RobertUporaba polimerov v industriji hitro narašča zaradi prednosti, ki jih ti materiali nudijo v primerjavi z bolj tradicionalnimi materiali, kot so npr. kovine. Napovedovanje napetostno-deformacijskega ... stanja konstrukcijskih polimernih elementov je lahko zanesljivo in uspešno le, če poznamo vse potrebne materialne funkcije. Za popolno karakterizacijo polimernih materialov je potrebno določiti 21 materialnih funkcij, kar je v praski zelo težko in drago, poleg tega pa s posameznimi eksperimenti ne dobimo odziva materiala v celotnem časovnem in frekvenčnem območju, v katerem se mu lastnosti spreminjajo. To so poglavitni razlogi, zakaj želimo iz ene izmerjenematerialne funkcije ostale izračunati. Da lahko določimo želeno funkcijo, t. j. naredimo interkonverzijo, je potrebno rešiti inverzni problem preko uporabe numeričnih metod. To so slabo pogojeni (ill - posed) problemi, ki so v tem delu predstavljeni in analizirani. Iz analize aproksimativnih metod interkonverzij materialnih funkcij iz statičnih v dinamične in iz dinamičnih v statične sledi, da se je potrebno enostavne metode za interkonverzijo med shranitvenim in relaksacijskim modulom G(t)=G'(w)/w=1/1 izogibati in da je najprimernejša metoda Schwarzla, ki vodi do napak velikosti 2%. Naslednji cilj je bila določitev optimalne procedure direktnih interkonverzij med modulom relaksacije in voljnostjo (in obratno). Pomembno je, da eksperimentalne podatke zgladimo z uporabo npr. zlepkov ("spline functions") in da so eksperimentalni podatki podani dovolj na gosto (500 na dekado), saj obravnavani metodi Hopkins-Hamminga in Knoff-Hopkinsa z naraščajočim številom podatkov konvergirata. Najbolj primerne metode za določeno vrsto interkonverzije so izbraneeee in uporabljene v računalniškem programu, ki omogoča interkonverzijo med materialnimi funkcijami, izračune diskretnih spektrov z metodo Emri - Tschoegl, glajenje krivulj preko metode zlepkov, izračune ter prikaz materialnih funkcij iz diskretnih spektrov.Type of material - dissertationPublication and manufacture - Ljubljana : [R. Cvelbar], 2005Language - slovenianCOBISS.SI-ID - 8347419
Author
Cvelbar, Robert
Other authors
Emri, Igor
Topics
polimeri |
viskoelastičnost |
materialne funkcije |
interkonverzija |
karakterizacija materialov |
polymers |
viscoelasticity |
material functions |
interconversion |
material characterization
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Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Mechanical Engineering, Ljubljana | Ljubljana | FSLJ |
reading room 1 cop.
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National and University Library, Ljubljana | Ljubljana | NUK |
reading room 1 cop.
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University of Maribor Library | Maribor | UKM |
reading room 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Cvelbar, Robert | 12661 |
Emri, Igor | 04316 |
Source: Personal bibliographies
and: SICRIS
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