Interfacial energy states of moisture-exposed cracks in mica

Wan, Kai-Tak, Aimard, Nicholas, Lathabai, S., Horn, Roger G. and Lawn, Brian R. 1990, Interfacial energy states of moisture-exposed cracks in mica, Journal of materials research, vol. 5, no. 1, pp. 172-182, doi: 10.1557/JMR.1990.0172.

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Title Interfacial energy states of moisture-exposed cracks in mica
Author(s) Wan, Kai-Tak
Aimard, Nicholas
Lathabai, S.
Horn, Roger G.
Lawn, Brian R.
Journal name Journal of materials research
Volume number 5
Issue number 1
Start page 172
End page 182
Total pages 11
Publisher Materials Research Society
Place of publication Pittsburgh, Pa.
Publication date 1990-01
ISSN 0884-2914
Keyword(s) moisture-exposed cracks in mica
energy states
Summary Results of crack growth observations on mica in water-containing environments are described. The study focuses on equilibrium crack states for reversed loading cycles, i.e., for initial propagation through virgin solid and subsequent retraction-repropagation through healed or misoriented-healed interfaces. Departures from these equilibrium states are manifest as steady-state forward or backward crack velocities at specific applied loads. The equilibria are thereby interpreted as quiescent, threshold configurations G = WE, with G the Griffith mechanical-energy-release rate and WE the Dupré work of adhesion, on crack velocity (v-G) diagrams. Generally, WE is found to decrease with concentration of water, in accordance with a Gibbs formalism. Hysteresis is observed in the forward-backward-forward crack propagation cycle, signifying a reduction in the adhesion energy on exposure of the open interface to environmental species prior to healing. This hysteresis is especially marked for those interfaces that are misoriented before healing, indicating that the structure of the underlying solid substrate as well as of the intervening fluid is an important consideration in the interface energetics. The equilibrium states for different environments can be represented on a simple energy-level diagram, as differences between thermodynamic end-point states: initial, closed-interface states refer to crystallographic bonding configurations ahead of the crack-tip adhesion zone; final, open interface states refer to configurations behind the crack-tip zone. The significance of this diagram in relation to the fundamental atomic structure of interfaces in fracture and other adhesion geometries, including implications concerning kinetics, is discussed.
Language eng
DOI 10.1557/JMR.1990.0172
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1990, Materials Research Society
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