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Cross-scale design of energy dissipative composites using self-repairing interfaces based on sacrificial bonds

Restrepo, Vanessa ; Martinez, Ramses V.

Materials & design, 2023-09, Vol.233, p.112283, Article 112283 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Cross-scale design of energy dissipative composites using self-repairing interfaces based on sacrificial bonds
  • Autor: Restrepo, Vanessa ; Martinez, Ramses V.
  • Assuntos: Energy-dissipating composite ; Mechanical adhesives ; Sacrificial bonds ; Self-assembled proteins ; Self-repairing interfaces
  • É parte de: Materials & design, 2023-09, Vol.233, p.112283, Article 112283
  • Descrição: [Display omitted] •Sacrificial bond composites (SBCs) exhibit high energy dissipation and fracture toughness.•SBCs can be fabricated, across scales, using self-assembled proteins and mechanical adhesives.•After complete fracture, the detached interfaces of SBCs can self-repair at room temperature.•Textile SBCs enable the development of lightweight energy-absorbing personal protective equipment with self-repairing capabilities. New composites with high energy dissipation and self-healing properties are required for structural materials, textiles, and protective equipment. This paper proposes a cross-scale strategy to design sacrificial bond composites (SBCs) using non-linear adhesive materials, like self-assembled proteins or mechanical adhesives, placed between opposite-facing magnets. Upon external loads, SBCs effectively dissipate deformation energy across their sacrificial bond interfaces following a biomimetic toughening mechanism similar to nacre’s. When the external load breaks the sacrificial bonds of a SBC, the opposite-facing magnets brings together the separated interface, allowing the reforming of its sacrificial bonds and the self-repairing of the composite after sustaining large strains. After mechanical failure at 600% strain, the consensus tetratricopeptide repeat (CTPR) protein films allows protein-based SBCs to recover 70% of their original tensile strength after letting their sacrificial bonds to reassemble for 1 h, at room temperature, in the presence of moisture. Mechanical adhesive-based SBCs, after their mechanical failure at 325% strain, are able to self-repair faster, regaining 85% of their tensile strength in less than 1 s. As a proof of concept, we demonstrate the fabrication of a reusable and lightweight fall arrest system exploiting mechanical adhesive interfaces and a protein-polyester yarn for the creation of high-energy dissipating textiles.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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