Micromechanics and Materials Laboratory
University of Wisconsin
Researchers
Students, collaborators and friends
Rod Lakes Home
Negative Poisson's ratio   Viscoelasticity   Cosserat solids   Biomechanics   Industrial research
  We are interested in materials with heterogeneous structure, including natural composites such as bone, ligament, and wood, as well as synthetic composites and cellular solids. We investigate the freedom of natural and synthesized materials to behave in ways not anticipated in elementary continuum representations, and to attain physical properties of much higher magnitude than anticipated from standard theories. Composites have been developed in which the composite stiffness is greater than the stiffness of any constituent in the composite. Viscoelastic materials are of particular interest as high performance damping materials and as materials which undergo creep in industrial settings. We determine viscoelastic properties over eleven orders of magnitude of frequency, with no need for temperature shifts.
  A major theme of research in our laboratory is the creation and characterization of materials with extreme and unusual physical properties. We have developed materials with reversed properties, including negative Poisson's ratio, negative stiffness, and negative thermal expansion.
  We pursue basic research as well as applied research for industry.
The Micromechanics Laboratory is located in room 212 of the Engineering Research Building (ERB).
Lab Facilities.
Collaborators:
W. Bonfield (Cambridge), Biomaterials
R. Carpick (Penn), nano-mechanics
R. Cooper (Brown), Materials Science, Geology
S. Cramer (Wisconsin), Civil Engineering, wood
W. Drugan (Wisconsin), Theoretical Mechanics
D. Eyre (Utah) Mathematics of composites
J. L. Katz (Case Western and Kansas City Dental), Biomedical engineering, Biomechanics. In memoriam, (2013).
Xiaochun Li (UCLA), Composite synthesis
A. Lal (Cornell) Electrical; Resonant Ultrasound
G. Milton (Utah) Mathematics of composites
J. B.Park, (Iowa) Biomaterials
A. Ruina A. Ruina 2 (Cornell) Bicycle mechanics, walking, mechanics
F. Scarpa (Bristol, England) Advanced materials and structures
D. Stone (Wisconsin), Materials Science
S. S. Sternstein (RPI - Union) Polymers, composites
C. Swan (Iowa) Theory of Composites
R. Vanderby (Wisconsin), Biomechanics. College page
A. Wineman (Michigan) Rheology, continuum mechanics
K. W. Wojciechowski (Poznan, Poland) Computational physics, advanced heterogeneous media including negative Poisson's ratio


Other groups
R. Behringer (Duke) Physics of granular materials
D. Bigoni (Trento, Italy) Solid mechanics
L. Berlyand (Penn State) Mathematics, composite materials
A. Cherkaev (Utah) Mathematics of composites
R. Gibala (Michigan) Materials, internal friction
R. Leisure (Colorado State), Resonant Ultrasound, internal friction
A. Sastry (Michigan) Multiscale materials
O. Sigmund (Lyngby, Denmark) Topology optimization
S. White (Illinois) Composites, self healing polymers
Visiting Scholars
    Dr. Xinchun Shang, Professor in Solid Mechanics and Associate Head of the Department, University of Science and Technology, Beijing, China, Spring 2005. Theoretical study of the stability of composites.
    Dr. Dong Li, Northeastern University, Shenyang, China, Spring and summer 2012. Study of vibration of materials with resonant ultrasound spectroscopy.

Students, Associates, Scientists:
S. Balch, Advanced Materials
S. Duenwald, Research Scientist, Ligament and tendon, with R. Vanderby
D. Faust, Advanced Materials
T. Jaglinski, Visiting Scientist, Advanced materials
H. Kalathur, Advanced Materials
J. Kondratko, Ligament and tendon, with R. Vanderby
A. LaCroix, Ligament and tendon, with R. Vanderby
J. Lehman, Advanced materials
B. Rodriguez, Advanced Materials
E. Sritham, viscoelasticity of food products, with Dr. S. Gunasekaran
Recent group alumni and last known location.
B. Brandel, Chipless Metals
P. Buechner, U. S. Patent Office
A. Butenhoff
J. Capodagli, Appleton     T. Carlson, Advanced materials
J. Dandrea, industry     M. Castillo, Materials
Liang Dong, research associate;     P. Frascone, Trek
D. Kochmann, (with Dr. W. Drugan), Fulbright fellow. Lehrstuhl fur Allgemeine Mechanik, Ruhr-Universitat Bochum; as of 2011 faculty at Caltech.
T. Jaglinski, Ph. D. (2006). Visiting scientist
P. Kohlhepp     R. Hingorani, medical school
T. Lee, PhD, 2001. Research associate at Harvard University, to faculty University of Singapore
M. Ludwigson, Symbiont, Milwaukee area, WI
Y. Liu (Bristol, U.K.);     K. Lynch
K. MacMillan, Medical Physics
E. Manley, Boston University
C. Mertz, wood mechanics;     B. Moore, advanced materials
C. Marquez, Americorps
S. Nimityongskul, Spacecraft Dynamics, U. W.
A. Oza, St. Jude Medical, Los Angeles, California
C. Sabo;    T. Schmidt
R. Schmitz, ATA Aircraft
A. Singh, ATS Corp., Bordentown NJ;     S. Soofi, industry
M. Torres
Y. C. Wang, Faculty, National Cheng Kung University, Taiwan.
J. Villerd (with Dr. W. Drugan), France
B. Welbes, Boeing;     H. W. Yap
research group
Research group (advanced materials and smart structures), June 2012. From left, Liang Dong, Professor Stone, T. M. Jaglinski, T.. Carlson, R. Lakes, H. Kalathur, Dong Li, J. Lehman.
Ligament and tendon project (not shown), Professor Vanderby, S. Duenwald-Kuehl, J. Kondratko, A. LaCroix.
Food project, Professor Gunasekran, E. Sritham.

research group
Research group (advanced materials), Nov. 2009. From left, R. Lakes, S. Soofi, Professor Stone, Y. Liu, L. Dong.
Ligament and tendon project, Professor Vanderby, S. Duenwald. Food project, Professor Gunasekran, E. Sritham. Polymer viscoelasticity project, K. Lynch.

Rod Lakes research group image 5
Research group, 2005. Seated, from left, S. Nimityongskul, J. Capodagli, B. Moore. Standing, T. Jaglinski, R. Lakes, D. Kochmann, A. Singh. Not present, C. Mertz, J. Villerd. Nano- composite collaborators (not shown) De Cicco, M., Konishi, H., Cao, G., Choi, H., Professor Turng, L. S., Professor Perepezko, J. H., Professor Kuo, S., and Professor Li, X.
Rod Lakes research group at University of Wisconsin
Research group, 2002. From left, R. Lakes, A. Oza (ligament), E. Manley (ligament), T. Jaglinski (metal creep), B. Welbes (advanced material development), R. Hingorani (ligament), Y. C. Wang (advanced material development). Not present, T. Schmidt.

collaborators Rod Lakes, Rob Carpick, Wendy Crone with laser in laser / viscoelasticity lab
Prof. Crone, Carpick, and Lakes in the holography laboratory.
Viscoelasticity lab
We thank the National Science Foundation, DARPA, various industries, and the Department of Agriculture for support.
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