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Fracture modes in curved brittle layers subject to concentrated cyclic loading in liquid environments

Published online by Cambridge University Press:  31 January 2011

Jae-Won Kim ,
Van P. Thompson ,
E. Dianne Rekow ,
Yeon-Gil Jung  and
Yu Zhang
Jae-Won Kim
Affiliation:
Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, New York 10010
Van P. Thompson
Affiliation:
Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, New York 10010
E. Dianne Rekow
Affiliation:
Basic Science Department, New York University College of Dentistry, New York, New York 10010
Yeon-Gil Jung
Affiliation:
School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea
Yu Zhang*
Affiliation:
Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, New York 10010
*
a) Address all correspondence to this author. e-mail: yz21@nyu.edu
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Abstract

Damage response of brittle curved structures subject to cyclic Hertzian indentation was investigated. Specimens were fabricated by bisecting cylindrical quartz glass hollow tubes. The resulting hemicylindrical glass shells were bonded internally and at the edges to polymeric supporting structures and loaded axially in water on the outer circumference with a spherical tungsten carbide indenter. Critical loads and number of cycles to initiate and propagate near-contact cone cracks and far-field flexure radial cracks to failure were recorded. Flat quartz glass plates on polymer substrates were tested as a control group. Our findings showed that cone cracks form at lower loads, and can propagate through the quartz layer to the quartz/polymer interface at lower number of cycles, in the curved specimens relative to their flat counterparts. Flexural radial cracks require a higher load to initiate in the curved specimens relative to flat structures. These radial cracks can propagate rapidly to the margins, the flat edges of the bisecting plane, under cyclic loading at relatively low loads, owing to mechanical fatigue and a greater spatial range of tensile stresses in curved structures.

Keywords

FatigueFractureLayered
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 1075 - 1081
Copyright
Copyright © Materials Research Society 2009

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References

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