Naslov
Creep and Relaxation of Prismatic Bar in State of Bending

Autori
Pustaić, Dragan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 9th International Congress of Croatian Society of Mechanics / Marović, Pavao ; Krstulović-Opara, Lovre ; Galić, Mirela - Split : Croatian Society of Mechanics (CSM), 2018, 88-99

Skup
9th International Congress of Croatian Society of Mechanics (ICCSM 2018)

Mjesto i datum
Split, Hrvatska, 18.09.2018. - 22.09.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Creep and relaxation, prismatic bar loaded on bending, viscoelastic strain, analytical method, variation method, Wolfram Mathematica 7.0

Sažetak
The viscoelastic behavior of prismatic bar in state of bending is investigated in this paper. When describing the creep phenomenon of such bar it is assumed that the bar is in the state of the steady-state creep conditions, i.e. at such state of creeping at which the stresses do not change with time. The dependence of creep strain on stress and time at a given temperature can be written as a product of two functions, of which the first function is a function of stress and temperature, and the second one is a function of time and temperature, [1-3]. The mentioned methodology of calculating is often used in the theory of viscoelasticity for determining the stress distribution in the different structural components, [2-3]. In order to find out how much the stress distribution in a bar is accurate and reliable, the same problem was solved by one variation method, i.e. by applying the principle of minimum of complementary potential energy, [1]. The compatibility of the obtained results was even more than expected, excellently. A second phenomenon which was considered in this paper was relaxation phenomenon of bending moment in a cross section of prismatic bar. At the initial moment (t = 0), the bending moment acting on the bar amounts to If a curvature of the bar is kept constant over time, the decrease of the bending moment over time is investigated, [3]. The analytical methods and one approximate numerical method were used in the analysis of creep and relaxation of prismatic bar. Some results, especially relaxation of bending moment, and their graphic interpretations were obtained by means of software package Wolfram Mathematica 7.0.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja, Strojarstvo, Zrakoplovstvo, raketna i svemirska tehnika

Napomena
Objavljeni rad ima prošireni sažetak (1 str.) koji je tiskan u knjizi "Book of Abstracts" na str. 88., dok je cjeloviti rad objavljen u elektroničkom obliku na USB-u (ISSN 2623-6133) i ima 12 stranica.

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