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Title:Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite -- Part I: Manual infiltration
Author(s):Brown, Eric N.; White, Scott R.; Sottos, Nancy R.
Abstract:As a first step towards a new crack healing methodology for cyclic loading, this paper examines two promising crack-tip shielding mechanisms during fatigue of a microcapsule toughened epoxy. Artificial crack closure is achieved by injecting precatalyzed monomer into the crack plane to form a polymer wedge at the crack tip. The effect of wedge geometry is also considered, as dictated by crack loading conditions during infiltration. Crack-tip shielding by a polymer wedge formed with the crack held open under the maximum cyclic loading condition (Kmax) yields temporary crack arrest and extends the fatigue life by more than 20 times. Hydrodynamic pressure and viscous damping as a mechanism of crack tip shielding are also investigated by injecting mineral oil into the crack plane. Viscous fluid flow leads to retardation of crack growth independent of initial loading conditions. The success of these mechanisms for retarding fatigue crack growth demonstrates the potential for in situ self-healing of fatigue damage.
Issue Date:2005-01
Publisher:Department of Theoretical and Applied Mechanics (UIUC)
Series/Report:TAM Reports 1060, (2005)
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:is peer reviewed
Date Available in IDEALS:2007-03-09
Is Version Of:Published as: Eric N. Brown, Scott R White, Nancy R. Sottos. Composites Science and Technology, Vol. 65, No. 15-16, 2005, pp. 2466-2473. DOI: 10.1016/j.compscitech.2005.04.020. Copyright 2005 Elsevier.

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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