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Indentation fracture of lead magnesium niobate-based multilayer composite structures

Published online by Cambridge University Press:  31 January 2011

M. H. Megherhi ,
G. O. Dayton ,
T. R. Shrout  and
J. J. Mecholsky Jr.
M. H. Megherhi
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
G. O. Dayton
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
T. R. Shrout
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
J. J. Mecholsky Jr.
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The effects of internal electrodes on the fracture properties of relaxor ferroelectric 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 multilayer structures were studied. It was observed that the position of the first electrode layer from the surface is critical to the strength and toughness of the multilayer structure. Positioning the electrode close to the surface was found to enhance interaction with cracks which initiate on the multilayer surface. This interaction limits the effective crack length and therefore increases the fracture strength and effective toughness of the composite. Samples indented parallel to the electrodes exhibited higher fracture strengths and toughness than those indented perpendicular to the conducting layers. Both parallel and perpendicular orientations gave higher strength and toughness than the control specimens (without electrodes).

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Articles
Information
Journal of Materials Research , Volume 5 , Issue 3 , March 1990 , pp. 515 - 523
Copyright
Copyright © Materials Research Society 1990

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References

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