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Hard magnetics in ultra-soft magnetorheological elastomers enhance fracture toughness and delay crack propagation

Miguel Angel Moreno-Mateos Orcid Logo, Mokarram Hossain Orcid Logo, Paul Steinmann Orcid Logo, Daniel Garcia-Gonzalez Orcid Logo

Journal of the Mechanics and Physics of Solids, Volume: 173, Start page: 105232

Swansea University Author: Mokarram Hossain Orcid Logo

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Abstract

Pre-existing flaws in highly stretchable elastomers trigger fracture under large deformations. For multifunctional materials, fracture mechanics may be influenced by additional physical phenomena. This work studies the implications of hard magnetics on the fracture behaviour of ultra-soft magnetorhe...

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Published in: Journal of the Mechanics and Physics of Solids
ISSN: 0022-5096
Published: Elsevier BV 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa62553
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Abstract: Pre-existing flaws in highly stretchable elastomers trigger fracture under large deformations. For multifunctional materials, fracture mechanics may be influenced by additional physical phenomena. This work studies the implications of hard magnetics on the fracture behaviour of ultra-soft magnetorheological elastomers (MREs). We experimentally demonstrate that MREs with remanent magnetisation have up to a 50 % higher fracture toughness than non pre-magnetised samples. Moreover, we report crack closure due to the magnetic field as a mechanism that delays the opening of cracks in pre-magnetised MREs. To overcome experimental limitations and provide further understanding, a phase-field model for the fracture of MREs is conceptualised. The numerical model incorporates magneto-mechanical coupling to demonstrate that the stress concentration at the crack tip is smaller when the MRE is pre-magnetised. Overall, this work unveils intriguing applications for functional actuators, with better fracture behaviour and potential better performance under cyclic loading.
Keywords: Hard magnetics, Ultra-soft magnetorheological elastomers, Multifunctional materials, Experimental mechanics, Phase-field modelling, Soft fracture
College: Faculty of Science and Engineering
Funders: ERC (Grant-No. 947723, project: 4D-BIOMAP); Horizon Europe programme (Grant-No. 101052785, project: SoftFrac)
Start Page: 105232