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相关概念视频

Elastin is Responsible for Tissue Elasticity01:12

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Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
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Elasticity in Concrete01:20

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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...
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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
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Dynamic Modulus of Elasticity of Concrete01:16

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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...
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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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相关实验视频

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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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弹性,坚固和坚的离子导电弹性弹性体.

Burebi Yiming1,2, Simon Hubert3, Alex Cartier1

  • 1Laboratoire Sciences et Ingénierie de la Matiére Molle, ESPCI Paris, CNRS, PSL University, Paris, France.

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概括

研究人员使用多重网络弹性体 (MNE) 架构开发了先进的离子导电弹性体 (ICE). 这些材料同时达到高强度和离子导电性,克服了可穿戴电子产品和电池的先前限制.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 电化学工程 电化学工程

背景情况:

  • 可伸缩弹性材料对于可穿戴设备和灵活电池等先进应用至关重要.
  • 在弹性体中实现高机械强度,性和离子导电性的同时组合一直是一个重大挑战.
  • 现有材料往往表现出一种权衡,牺牲一种属性以换取另一种.

研究的目的:

  • 开发出新的离子导电弹性质体 (ICEs),具有出色的机械性能和高离子导电性,而不会妥协.
  • 调查多重网络弹性体 (MNE) 架构在实现这种平衡方面的有效性.
  • 探索材料架构,机械性能和离子传输之间的关系.

主要方法:

  • 合成具有多重网络弹性体 (MNE) 架构的离子导电弹性体.
  • 机械性能的表征,包括刚性,弹性和抗破裂性.
  • 在室温下测量离子导电性.
  • 基于多国企业的ICE与简单网络弹性体的比较.

主要成果:

  • 采用MNE架构开发的ICE显示出高离子导电性 (约为10-3S/cm) 和显著的机械强度 (破裂时应力~8MPa).
  • 相比之下,没有MNE架构的弹性体表现出明显较低的离子导电性 (10-5 S/cm) 和较低的强度 (<1.5 MPa).
  • 多国企业架构有效地增强了细分移动性,提高了离子导电性,同时通过牺牲键机制保持机械完整性.

结论:

  • 跨国企业架构提供了一个可行的策略,以创建高性能离子导电弹性体.
  • 这些材料克服了机械强度和离子导电性之间的典型权衡.
  • 开发的ICE对可穿戴电子产品,可伸缩电池和其他先进的灵活设备的应用非常有前途.