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Časovno odvisna strižna relaksacija silikonske gume
ID Šutanovac, Luka (Author), ID Slemenik Perše, Lidija (Mentor) More about this mentor... This link opens in a new window

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Abstract
Pri uporabi tesnil iz gume prihaja do relaksacije napetosti v materialu. To lahko povzroči, da tesnila ne zagotavljajo več ustreznega tesnenja v sistemih, kjer jih uporabljamo. V sklopu naloge želimo izmeriti spremembe napetosti v silikonski gumi v daljšem časovnem obdobju. V ta namen smo vzorce silikonske gume s pomočjo rotacijskega reometra obremenjevali s konstantno strižno deformacijo in merili padanje strižne napetosti s časom. Preizkuse smo izvajali pri različnih temperaturah v krajšem časovnem obdobju. Izračunane vrednosti relaksacijskih modulov pri različnih temperaturah smo nato s pomočjo časovno-temperaturne superpozicije pretvorili v vrednosti, ki nam prikazujejo relaksacijske lastnosti materiala v daljšem časovnem obdobju. Analiza strižne relaksacije pokaže, da se je vrednost relaksacijskega modula silikonske gume v časovnem obdobju 10 let spremenila za 30 odstotkov. Rezultati torej kažejo, da moramo pri uporabi silikonske gume za tesnenje upoštevati njeno časovno odvisnost.

Language:Slovenian
Keywords:polimeri, silikonska guma, relaksacija, časovno odvisne lastnosti, vpliv temperature, časovno-temperaturna superpozicija
Work type:Final paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Place of publishing:Ljubljana
Publisher:[L. Šutanovac]
Year:2019
Number of pages:XIV, 30 f.
PID:20.500.12556/RUL-110498 This link opens in a new window
UDC:539.3:62-762:678.84(043.2)
COBISS.SI-ID:16951835 This link opens in a new window
Publication date in RUL:15.09.2019
Views:1130
Downloads:948
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Secondary language

Language:English
Title:Time dependent shear relaxation of silicone rubber
Abstract:
In application where rubber seals are used, we encounter relaxation of stress in the material. That can cause inadequate sealing propereties in such systems. In this study, we want to determine long term changes of stress in silicone rubber. With the use of a rotational rheometer, we exposed prepared samples of silicone rubber to a constant shear strain and measured the decrease of shear stress in time. The tests were performed at different temperatures in a short time period. The experimental results were used to calculate the values of relaxation moduli, which were transformed into data used for displaying the changes of stress relaxation in a longer time period by using time-temperature superposition. Analysis of shear relaxation shows, that the value of the relaxation modulus changed by 30 % in a 10-year period. The results therefore suggest that time dependent mechanical propereties have to be considered when using silicon rubber for sealing applications.

Keywords:polymers, silicone rubber, relaxation, time dependent propereties, effect of temperature, time-temperature superposition

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