NDLI: Fatigue Response of Solvent-Based Self-Healing Smart Materials

Content Provider	Springer Nature Link
Author	Neuser, S. Michaud, V.
Copyright Year	2013
Abstract	We investigated the healing of epoxy resins with embedded ethyl phenylacetate (EPA) solvent loaded capsules and shape memory alloy (SMA) wires under fatigue loading in tapered double cantilever beam (TDCB) mode. Under cyclic loading, the kinetics of solvent diffusion are in competition with the rate of damage propagation. We showed that the active mechanism of self-healing under continuous loading is different from that in quasi-static testing. Crack arrest was observed after some initial crack growth, resulting from the diffusion of EPA solvent into the crack tip, involving local plasticization of the epoxy. Finite element analysis confirmed that the lower modulus and higher elongation at break of the solvated epoxy reduced the stresses at the crack tip. This effect combined with the well-studied microcapsule toughening effect, tremendously increased the toughness of plain epoxy. For epoxy with embedded SMA wires, completely fractured samples, healed using SMA activation, showed similar fatigue resistance as virgin samples. Furthermore, SMA activation during a 10 min break also stabilized crack progression, compared to at least 2 h needed to reach the same effect without SMA wires.
Starting Page	293
Ending Page	304
Page Count	12
File Format	PDF
ISSN	00144851
Journal	Experimental Mechanics
Volume Number	54
Issue Number	2
e-ISSN	17412765
Language	English
Publisher	Springer US
Publisher Date	2013-08-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Self-healing polymer Smart composite SMA Fatigue testing Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Optics, Optoelectronics, Plasmonics and Optical Devices Structural Mechanics Vibration, Dynamical Systems, Control Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering Aerospace Engineering

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