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Related Concept Videos

Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
Elasticity in Concrete01:20

Elasticity in Concrete

Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear portion of...
Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen also...
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
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Fiber Reinforced Concrete

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...

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Updated: Jun 10, 2026

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
14:24

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration

Published on: March 12, 2014

Multi-scale structural engineering enables ultra-strong and tough eutectogels.

Ning Tang1, Yanlong Yin1, Hao Zhang2

  • 1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China.

Nature Communications
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create stronger, stiffer, and tougher polymer gels by precisely controlling their structure at multiple scales. This breakthrough overcomes traditional limitations in material science for advanced applications.

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Last Updated: Jun 10, 2026

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
09:38

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

Published on: November 7, 2016

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Polymer gels often face a trade-off between strength, stiffness, and toughness due to inherent thermodynamic incompatibilities.
  • Simultaneously enhancing these mechanical properties is crucial for developing advanced soft materials.

Purpose of the Study:

  • To present a multi-scale regulation approach for synergistic enhancement of polymer gel mechanical properties.
  • To overcome the conventional trade-offs between energy storage and dissipation in polymer networks.

Main Methods:

  • Utilized a combination of directional annealing and deep eutectic solvent-mediated solvent exchange.
  • Precisely modulated the polymer network structure at molecular, nanoscale, and microscale levels.
  • Developed poly(vinyl alcohol) eutectogels through a coordinated hierarchical design.

Main Results:

  • Achieved exceptional tensile strength (62.2 MPa), Young's modulus (355.3 MPa), and toughness (179.0 MJ m⁻³).
  • Demonstrated significant enhancements (311x, 11843x, 597x) compared to the original hydrogel.
  • Exhibited high fracture resistance (131.5 kJ m⁻²), fatigue threshold (15.9 kJ m⁻²), and damping efficiency (95.8%).

Conclusions:

  • The multi-scale regulation strategy effectively overcomes mechanical property trade-offs in polymer gels.
  • Established universal principles for designing next-generation soft materials with superior performance.
  • The developed eutectogels show potential for flexible electronics, wearable devices, and impact-resistant systems.