Elasticity-controlled jamming criticality in soft composite solids

Yiqiu Zhao (), Haitao Hu, Yulu Huang, Hanqing Liu, Caishan Yan, Chang Xu, Rui Zhang, Yifan Wang and Qin Xu ()
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Yiqiu Zhao: The Hong Kong University of Science and Technology
Haitao Hu: The Hong Kong University of Science and Technology
Yulu Huang: The Hong Kong University of Science and Technology
Hanqing Liu: Los Alamos National Laboratory
Caishan Yan: The Hong Kong University of Science and Technology
Chang Xu: The Hong Kong University of Science and Technology
Rui Zhang: The Hong Kong University of Science and Technology
Yifan Wang: Nanyang Technological University
Qin Xu: The Hong Kong University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Soft composite solids are made of inclusions dispersed within soft matrices. They are ubiquitous in nature and form the basis of many biological tissues. In the field of materials science, synthetic soft composites are promising candidates for building various engineering devices due to their highly programmable features. However, when the volume fraction of the inclusions increases, predicting the mechanical properties of these materials poses a significant challenge for the classical theories of composite mechanics. The difficulty arises from the inherently disordered, multi-scale interactions between the inclusions and the matrix. To address this challenge, we systematically investigated the mechanics of densely filled soft elastomers containing stiff microspheres. We experimentally demonstrate how the strain-stiffening response of the soft composites is governed by the critical scalings in the vicinity of a shear-jamming transition of the included particles. The proposed criticality framework quantitatively connects the overall mechanics of a soft composite with the elasticity of the matrix and the particles, and captures the diverse mechanical responses observed across a wide range of material parameters. The findings uncover a novel design paradigm of composite mechanics that relies on engineering the jamming properties of the embedded inclusions.

Date: 2024
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DOI: 10.1038/s41467-024-45964-y

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