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Effects of loading rate on the deformation and cracking of dental multilayers: Experiments and models

Published online by Cambridge University Press:  01 April 2006

Xinrui Niu*
Affiliation:
Princeton Institute of Science and Technology of Materials (PRISM) and the Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, 08544
Wole Soboyejo
Affiliation:
Princeton Institute of Science and Technology of Materials (PRISM) and the Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, 08544
*
a) Address all correspondence to this author. e-mail: xniu@princeton.edu
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Abstract

The paper presents the results of combined experimental, analytical, and computational studies of contact-induced deformation and cracking in dental multilayers. These include studies of individual layers and composite structures that consist of tri-layers of glass bonded to ceramic-filled polymer foundation with an acrylate-based join material. Loading-rate-dependent Young's moduli of the join and foundation materials were obtained from monotonic compression tests. Critical loads were also determined for the tri-layers from Hertzian contact tests at different loading rates. The fracture onset (sub-surface radial cracking) was detected using an in situ telescope. The measured rate-dependent Young's moduli were then incorporated into a finite element model that was used to predict the rate-dependent critical loads in the tri-layer system. Finally, the paper shows that the observed loading rate-dependence of the critical load (for radial cracking) is due to the combined effects of slow crack growth in glass and rate-dependent Young's moduli in the join and foundation layers.

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Articles
Copyright
Copyright © Materials Research Society 2006

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References

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