Tunable rebound of millimeter-sized rigid balls by magnetic actuation of elastomer-based surface microstructures

Kriegl, Raphael (author), Jezeršek, Matija (author), Kravanja, Gaia (author), Hribar, Luka (author), Mukhi, Soham M. (author), Kokot, Gašper (author), Drevenšek Olenik, Irena (author), Shamonin, Mikhail (author)

A novel method for controlling the rebound behavior of small balls made of Al$_2$O$_3$ with a radius of 2.381 mm is presented. It uses different types of micro-structured surfaces of soft magnetoactive elastomers. These surfaces were fabricated via laser micromachining and include fully ablated surfaces as well as micrometer-sized lamellas with a fixed width of 90 µm, height of 250 µm and three different gap sizes (15, 60 and 105 µm). The lamellas can change their orientation from edge-on to face-on configuration according to the direction of the external magnetic field from a permanent magnet. The orientation of the external magnetic field significantly influences the rebound behavior of the balls, from a coefficient of restitution e of $\approx 0.5$ to < 0.1. The highest relative change in the coefficient of restitution between zero field and face-on configuration of $\approx 80 \%$ is observed for lamellas with a gap of 60 µm. Other characteristics of the ball rebound such as the penetration depth into an Magnetoactive elastomer and the maximum deceleration are investigated as well. The proposed method does not require a constant power supply due to the use of permanent magnets. It may find novel applications in the field of impact engineering.

• Language: English
• Keywords: magnetoactive elastomers, magnetorheological elastomers, magnetoresponsive surfaces
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication version: Author Accepted Manuscript
• Publication date: 03.05.2024
• Year: 2024
• Number of pages: 11 str.
• Numbering: Vol. 33, no. 6, art. no. 067001
• PID: 20.500.12556/RUL-156120
• UDC: 539.2
• ISSN on article: 0964-1726
• DOI: 10.1088/1361-665X/ad41a9
• COBISS.SI-ID: 194802691
• Publication date in RUL: 09.05.2024

Record is a part of a journal

• Title: Smart materials and structures
• Shortened title: Smart mater. struc.
• Publisher: IOP Publishing
• ISSN: 0964-1726
• COBISS.SI-ID: 13497861

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: magnetoaktivni elastomeri, magnetoreološki elastomeri, magnetno odzivne površine