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Summary: In this study, a new class of elastomer-metal foam composites with tunable mechanical stiffness is proposed, fabricated, and characterized. The composite consists of two foams, one metallic and the other elastomeric, and the stiffness of the composite can be adjusted by inducing phase changes in the metallic foam. The composite exhibits a sharp stiffness change of approximately 1000x, making it a promising material for various applications.
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Summary: Compared with traditional single network elastomers, multiple network elastomers (MNEs) can achieve high stiffness and toughness, similar to elastomer composites. The mechanical response of MNEs depends significantly on the prestretching ratio of the filler network, and the damage of the polydisperse network is the underlying mechanism for the Mullins effect. Incorporating the effect of prestretch caused by the matrix in the constitutive model allows for a better description of the stress-strain response of MNEs with varied stretching ratios, surpassing classic damage models based on Langevin statistics.
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