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Composite Materials with Viscoelastic Stiffness Greater Than Diamond

Jaglinski, T. and Kochmann, D. M. and Stone, D. and Lakes, R. S. (2007) Composite Materials with Viscoelastic Stiffness Greater Than Diamond. Science, 315 (5812). pp. 620-622. ISSN 0036-8075. doi:10.1126/science.1135837.

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We show that composite materials can exhibit a viscoelastic modulus (Young's modulus) that is far greater than that of either constituent. The modulus, but not the strength, of the composite was observed to be substantially greater than that of diamond. These composites contain bariumtitanate inclusions, which undergo a volume-change phase transformation if they are not constrained. In the composite, the inclusions are partially constrained by the surrounding metal matrix. The constraint stabilizes the negative bulk modulus (inverse compressibility) of the inclusions. This negative modulus arises from stored elastic energy in the inclusions, in contrast to periodic composite metamaterials that exhibit negative refraction by inertial resonant effects. Conventional composites with positive-stiffness constituents have aggregate properties bounded by a weighted average of constituent properties; their modulus cannot exceed that of the stiffest constituent.

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Kochmann, D. M.0000-0002-9112-6615
Additional Information:© 2007 American Association for the Advancement of Science. 3 October 2006; accepted 12 December 2006. Partial support by NSF and by the NSF Materials Research Science and Engineering Center program is gratefully acknowledged. We thank W. Drugan for stimulating discussions.
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Issue or Number:5812
Record Number:CaltechAUTHORS:20131001-082855007
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41578
Deposited By: Dennis Kochmann
Deposited On:01 Oct 2013 20:59
Last Modified:10 Nov 2021 04:31

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