Mitigation of Fatigue Damage in Self-Healing Vascular Materials

Andrew Hamilton, Nancy R. Sottos, Scott R. White

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The fatigue response of an epoxy matrix containing vasculature for the delivery of liquid healing agents is investigated. The release of a rapidly curing, two-part epoxy healing chemistry into the wake of a propagating crack reduces the rate of crack extension by shielding the crack tip from the full range of applied stress intensity factor. Crack propagation is studied for a variety of loading conditions, with the maximum applied stress intensity factor ranging from 62 to 84% of the quasi-static fracture toughness of the material. At the highest level of applied load, the rate of mechanical damage is so fast that the healing agents do not fully mix and polymerize, and the effect of healing is minimal. The self-healing response is most effective at impeding the slower propagating cracks, with complete crack arrest occurring at the lowest level of applied load, and reductions of 79–84% in the rate of crack extension at intermediate loads.
Original languageEnglish
Pages (from-to)5575-5581
JournalPolymer
Volume53
Issue number24
Early online date28 Sep 2012
DOIs
Publication statusPublished - 09 Nov 2012

Keywords

  • self-healing
  • fatigue
  • microvascular network

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry

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