A Half-Cycle Negative-Stiffness Damping Model and Device Development

THE MODEL UPDATING OF MASS, DAMPING AND STIFFNESS MATRICES

Extreme damping in composite materials with a negative stiffness phase.

Composites with negative stiffness inclusions in a viscoelastic matrix are shown to have higher stiffness and mechanical damping tandelta than that of either constituent and exceeding conventional bounds. The causal mechanism is a greater deformation in and near the inclusions than the composite as a whole. Though a block of negative stiffness is unstable, negative stiffness inclusions in a com...

the model updating of mass, damping and stiffness matrices

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Negative stiffness and enhanced damping of individual multiwalled carbon nanotubes

The mechanical instabilities and viscoelastic response of individual multiwalled carbon nanotubes and nanofibers (MWCNTs/Fs) under uniaxial compression are studied with atomic force microscopy. Specific buckling events are evident by regimes of negative stiffness, i.e., marked drops in force with increasing compression. Uniaxial cyclic loading can be repeatedly executed even in initially postbu...

Advanced damper with high stiffness and high hysteresis damping based on negative structural stiffness

0020-7683/$ see front matter 2013 Elsevier Ltd. A http://dx.doi.org/10.1016/j.ijsolstr.2013.03.018 ⇑ Corresponding authors. Tel.: +1 608 346 7275 (L. Don E-mail addresses: [email protected] (L. (R. Lakes). High structural damping combined with high stiffness is achieved by negative stiffness elements. Negative incremental structural stiffness occurs when a column with flat ends is subjecte...