Roderic Lakes

Wisconsin Distinguished Professor,
Department of Engineering Physics, Engineering Mechanics Program, Department of Materials Science, Rheology Research Center, Department of Biomedical Engineering, College of Engineering.
University of Wisconsin

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Columbia University,
Rensselaer Polytechnic Institute,
  B.S.; Ph.D.
Yale University,
  Research Associate.
Research group, collaborators and laboratory

Publication list

Links: University, maps and more.

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Rod Lakes and brass badger Rod Lakes in Graz Austria Rod Lakes in Graz Austria 2 Rod Lakes in research and teaching lab Rod Lakes in Madison, Wisconsin Rod Lakes laser lab Rod Lakes research group Diana Lakes art faculty email list for software staff email list for software Rod image

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Rod Lakes research image
New materials
Research summary
  We study materials with heterogeneous structure, including natural viscoelastic composites such as bone, ligament, tendon and wood, as well as synthetic composites, biomaterials, and cellular solids with structural hierarchy. We investigate the freedom of natural and synthesized materials to behave in ways not anticipated in elementary continuum representations, to ameliorate stress concentrations, and to attain physical properties of much higher magnitude than anticipated from standard theories. Designed Cosserat solids have been made by 3D printing. Viscoelastic materials are of particular interest as high performance damping materials and as practical materials which undergo creep in industrial settings. We determine viscoelastic properties including internal friction, dependence on strain rate, and creep over eleven orders of magnitude of frequency and time, with no need for temperature shifts.
  In our laboratory we synthesize and characterize materials with extreme and unusual physical properties. Materials which undergo phase transformation are of interest in the context of viscoelastic damping and of negative stiffness. We have developed new materials with reversed properties, including negative Poisson's ratio (auxetic), negative stiffness, and negative thermal expansion. Designed materials can have thermal expansion or piezoelectric sensitivity of arbitrarily large magnitude. Designed lattices have zero thermal expansion. Composite materials stiffer than diamond over a temperature range have been demonstrated in the lab. Such materials may be called metamaterials but we have not done so.
  We also study practical composite materials such as dental composites for tooth restorations and aircraft composites in the context of damage resistance and damage tolerance as well as moisture ingression. Piezoelectric composites and lattices, chiral elastic lattices, as well as thermoelastic composites and lattices are presently of particular current interest. We pursue basic research as well as applied research for industry. Industrial research has included high temperature performance studies of alloys for small engines, improved shoe insoles, and advanced dampers.

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