Naprava za testiranje odpornosti na udarce

Kostantino, Matic (author), Česnik, Martin (mentor)

Zaključno delo obravnava razvoj, izdelavo in vrednotenje naprave za testiranje odpornosti na udarce. Naprava je zmožna izstreljevati jeklene kroglice premera 17 mm z zahtevano kinetično energijo. Izbrani koncept za pospešek kroglice v jekleni cevi z določeno nadmero uporablja komprimiran zrak. S pomočjo magnetnega polja se pridržuje kroglica v poziciji, tako deluje kroglica kot ventil, popolno odprtje ventila se zgodi v trenutku, ko se prekine elekrični tok, ki napaja tuljavo. Z analitičnimi izračuni so se dimenzionirale tako pnevmatske komponente, kot tudi dolžina cevi in tuljava. Eksperimentalna analiza kaže, da so zahteve dosežene in da je ponovljivost za izvedbo testiranja ustrezna. V območju delovanja od 0 do 7 bar je naprava sposobna izstreliti kroglico z največjo kinetično energijo 110 J, ki je od 10 do 30 % manjša v primerjavi z izračunanimi vrednostmi.

• Language: Slovenian
• Keywords: odpornost na udarce, mehanski preizkus, konstrukcija naprave, kinetična energija, balistika
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2024
• Number of pages: XII, 34 f.
• PID: 20.500.12556/RUL-160456
• UDC: 620.176.5:531.55/.58(043.2)
• COBISS.SI-ID: 216708355
• Publication date in RUL: 29.08.2024

KOSTANTINO, Matic, 2024, Naprava za testiranje odpornosti na udarce [online]. Bachelor’s thesis. [Accessed 17 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=160456

Secondary language

• Language: English
• Title: Impact-shield testing device

Abstract

The final project addresses the development, production, and evaluation of a device for testing impact resistance. The device can launch steel balls with a diameter of 17 mm with required kinetic energy. The chosen concept for the acceleration of a ball in a steel tube with a certain excess uses compressed air. With the help of a magnetic field, the ball is held in position, so the ball works like a valve. The full opening of the valve occurs at the moment when the electric current supplying the coil is interrupted. Analytical calculations were used to dimension pneumatic components, as well as the length of the pipe and the coil. Experimental analysis shows that the requirements are met and that the reproducibility for testing is adequate. In the operating range from 0 to 7 bar, the device can launch a ball with a maximum kinetic energy of 110 J, which is 10 to 30 % lower compared to the calculated values.

• Keywords: impact resistance, mehanical test, device construction, kinetic energy, balistics