Results 241 to 250 of about 391,234 (275)

Polydimethylsiloxane gel thickness and stiffness affect the initial adhesion of Escherichia coli and Staphylococcus aureus.

RSC Appl Polym
Barajas B, Chiang MC, Lechner D, Uwazuruonye-Anyanwu U, Schiffman JD.   +4 more
europepmc   +1 more source

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SMA Negative Stiffness Damper

2020 International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS), 2020
A negative stiffness damping device with double convex spherical surface and SMA cables is proposed. Its design principle and deformation mechanism are introduced. Theoretical derivation and finite element simulation were conducted to explore the relationship between lateral displacements and restoring forces.
Hua-hui Chang, Sa-sa Cao, Hong-yan Ji
openaire   +1 more source

Quasi‐All‐Directional Negative Stiffness Metamaterials Based on Negative Rotation Stiffness Elements

physica status solidi (b), 2020
Most negative stiffness metamaterials exhibit negative stiffness effects in only one direction. Herein, based on the theory of anisotropy, the concept of “negative stiffness” is redefined. A method to determine whether a material has all‐directional negative stiffness is proposed.
Shaowei Zhu, Xiaojun Tan, Shuai Chen, Bing Wang, Li Ma, Linzhi Wu   +5 more
openaire   +1 more source

Constrained negative stiffness metamaterials.

The Journal of the Acoustical Society of America, 2010
Acoustics-oriented metamaterial research has focused primarily on the use of subwavelength resonant structures to elicit unconventional macroscale properties such as negative mass, anisotropic density, and negative stiffness. Unfortunately, reliance on resonant behavior limits the usefulness of these types of metamaterials to a narrow band of ...
Lia B. Kashdan, Michael R. Haberman, Preston S. Wilson, Carolyn Conner Seepersad   +3 more
openaire   +1 more source

Negative-stiffness vibration isolation

2010 3rd International Nanoelectronics Conference (INEC), 2010
A new kind of vibration isolator, which is base on negative-stiffness theory, is made out for nano manufacture. In this paper, vibration isolation theory is mentioned to further explain negative-stiffness, and then Euler Columns and another negative-stiffness structure are introduced. Furthermore, the stiffness expression is figured out.
null Liu Fang, null Pang Xiangyang, null Liu Zhigang, null Zhang Tao, null Huang Hongbiao, null Zhu Jianqiang   +5 more
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Positive–Negative Stiffness Actuators

IEEE Transactions on Robotics, 2019
Compliant actuators are typically designed to possess a tunable positive stiffness characteristic in order to generate restoring force upon displacement. These actuators either require two independent motor units or closed-loop control to change both their equilibrium position and output stiffness.
David J. Braun, Vincent Chalvet, Abhinav Dahiya   +2 more
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Magnetic negative stiffness dampers

Smart Materials and Structures, 2015
This communication presents the design principle and experimental validation of two novel configurations of magnetic negative stiffness dampers (MNSDs), both of which are composed of several permanent magnets arranged in a conductive pipe. The MNSD, as a passive device, efficiently integrates negative stiffness and eddy-current damping in a simple and ...
Xiang Shi, Songye Zhu
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Extreme stiffness systems due to negative stiffness elements

American Journal of Physics, 2003
When an elastic object is pressed, we expect it to resist by exerting a restoring force. A reversal of this force corresponds to negative stiffness. If we combine elements with positive and negative stiffness in a composite, it is possible to achieve stiffness greater than (or less than) that of any of the constituents.
Y. C. Wang, R. S. Lakes
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