Several salient articles
Lakes, R. S. and Saha, S., "Cement line motion in bone," Science, 204,
501-503 (1979). Download pdf.
Motion at the cement lines occurs in bone under prolonged torsional load. Such motion is considered responsible for the long term creep in bone. The absence of an asymptotic creep strain is consistent with an interpretation of the cement line as a viscous interface.
Lakes, R. S., Yoon, H. S. and Katz, J. L., "Slow compressional wave propagation in wet human and bovine cortical bone", Science, 220 513-515, (1983). Download
pdf.
A second slow compressional ultrasonic wave is observed in wet bone. It is attributed to interaction between the fluid and solid phases.
Lakes, R. S., "Foam structures with a negative Poisson's ratio", Science, 235 1038-1040 (1987). Article in html;
Download pdf.
Foams are developed in which the cross section becomes fatter when stretched.
Lakes, R. S., "Negative Poisson's ratio materials", Science 238 551 (1987).
The negative Poisson effect is not due to Cosserat elasticity.
Download pdf, gif
Lakes, R. S., "No contractile obligations", Nature, 358, 713-714, (1992). Article in pdf
Negative Poisson's ratio porous polymers are placed within the context of advances in negative Poisson's ratio materials.
Lakes, R. S., "Materials with structural hierarchy", Nature, 361, 511-515 (1993). Cover article.
Article in html
Many natural and man-made materials exhibit structure on more than one length scale; in some materials, the structural elements themselves have structure. Such materials can have extreme properties. Low density cellular solids with with a high ratio of strength to weight are presented.
Lakes, R. S., "Lateral deformations in extreme matter", Science, 288, 1976, (2000).
article link or get pdf
here.
A report of negative Poisson's ratio in plasma crystals and neutron star crust is reviewed.
Lakes, R. S., "Extreme damping in compliant composites with a negative stiffness phase"
Philosophical Magazine Letters,81, 95-100 (2001).
Article in pdf.
Unit cells of compliant composites in which one phase has negative stiffness are considered. Singular damping is observed.
Lakes, R. S., "Extreme damping in composite materials with a negative stiffness phase",
Physical Review Letters, 86, 2897-2900, (2001).
Article in pdf
Composites with a phase of negative stiffness are analyzed.
Lakes, R. S., Lee, T., Bersie, A., and Wang, Y. C., "Extreme damping in composite
materials with negative stiffness inclusions", Nature, 410, 565-567, (2001).
Article in pdf
Inclusions of negative stiffness in a composite can be stabilized within a positive-stiffness matrix. Here we describe the experimental realization of this composite approach by embedding
negative-stiffness inclusions of ferroelastic vanadium dioxide in a pure tin matrix. The resulting composites exhibit extreme mechanical damping and large anomalies in stiffness, as a consequence
of the high local strains that result from the inclusions deforming more than the composite as a whole.
Lakes, R. S., "A broader view of membranes", Nature, 414, 503-504, 29 Nov. (2001). Article in pdf
Negative Poisson's ratio membranes are reviewed and interpreted.
Jaglinski, T., Kochmann, D., Stone, D., Lakes, R. S. "Materials with viscoelastic stiffness greater than diamond", Science 315, 620-622, Feb. 2 (2007)
We show that composite materials can exhibit a viscoelastic (Young's) modulus far higher than that of either constituent; indeed, greater than that of diamond.
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