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Related Concept Videos

Types of Damping01:20

Types of Damping

6.6K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

129
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
129
Damped Oscillations01:07

Damped Oscillations

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
6.0K
Superplasticizers01:30

Superplasticizers

113
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
113
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

126
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
126

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Updated: Sep 3, 2025

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
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An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature

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Nacre-like composites with superior specific damping performance.

Wilhelm Woigk1, Erik Poloni2, Madeleine Grossman3

  • 1Complex Materials, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|July 25, 2022
PubMed
Summary
This summary is machine-generated.

Bio-inspired composites mimic nacre

Keywords:
bio-inspired materialsextreme dampinghierarchical structuresnacre

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Nanotechnology

Background:

  • Nacre, a natural composite, exhibits exceptional mechanical properties due to its microstructural design.
  • While nacre's fracture toughness is well-studied in bio-inspired materials, its damping properties remain underexplored in synthetic composites.
  • Understanding nacre's microstructural features is key to developing advanced damping materials.

Purpose of the Study:

  • To investigate the damping behavior of nacre-like composites.
  • To elucidate the role of mineral bridges and platelet asperities on damping properties.
  • To explore design concepts for high-performance bio-inspired damping materials.

Main Methods:

  • Fabrication of nacre-like composites with nanoscale structural features.
  • Dynamic mechanical analysis (DMA) to measure damping properties.
  • Comparative analysis with natural nacre and other composites.

Main Results:

  • Nacre-like composites with mineral bridges and platelet asperities show enhanced damping.
  • These features improve stress transfer between platelets and at interfaces.
  • The developed composites exhibit superior damping performance compared to natural nacre and fiber composites.

Conclusions:

  • Nanoscale structural features significantly enhance the damping properties of nacre-like composites.
  • Mineral bridges and nano-asperities are crucial for improved damping performance.
  • These findings provide design principles for advanced bio-inspired damping materials.