Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite - Part I: Manual infiltration

E. N. Brown; S. R. White; N. R. Sottos

doi:10.1016/j.compscitech.2005.04.020

Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite - Part I: Manual infiltration

E. N. Brown, S. R. White, N. R. Sottos

Research output: Contribution to journal › Article › peer-review

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 (K_max) 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.

Original language	English (US)
Pages (from-to)	2466-2473
Number of pages	8
Journal	Composites Science and Technology
Volume	65
Issue number	15-16 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.compscitech.2005.04.020
State	Published - Dec 2005

Keywords

A. polymer-matrix composites
A. smart materials
B. fatigue
C. failure criterion
Self-healing

ASJC Scopus subject areas

General Engineering
Ceramics and Composites

Online availability

10.1016/j.compscitech.2005.04.020

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title = "Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite - Part I: Manual infiltration",

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.",

keywords = "A. polymer-matrix composites, A. smart materials, B. fatigue, C. failure criterion, Self-healing",

author = "Brown, {E. N.} and White, {S. R.} and Sottos, {N. R.}",

note = "Funding Information: The authors gratefully acknowledge support from the AFOSR Aerospace and Materials Science Directorate Mechanics and Materials Program (Award No. F49620-02-1-0080), the National Science Foundation (NSF CMS0218863), and Motorola Labs, Motorola Advanced Technology Center, Schaumburg Ill. The authors also thank Profs. J.S. Moore and P.H. Geubelle of the University of Illinois and Dr. A. Skipor of Motorola Labs for technical support and helpful discussions. ",

year = "2005",

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doi = "10.1016/j.compscitech.2005.04.020",

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journal = "Composites Science and Technology",

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AU - White, S. R.

AU - Sottos, N. R.

N1 - Funding Information: The authors gratefully acknowledge support from the AFOSR Aerospace and Materials Science Directorate Mechanics and Materials Program (Award No. F49620-02-1-0080), the National Science Foundation (NSF CMS0218863), and Motorola Labs, Motorola Advanced Technology Center, Schaumburg Ill. The authors also thank Profs. J.S. Moore and P.H. Geubelle of the University of Illinois and Dr. A. Skipor of Motorola Labs for technical support and helpful discussions.

PY - 2005/12

Y1 - 2005/12

N2 - 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.

AB - 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.

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KW - B. fatigue

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Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite - Part I: Manual infiltration

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