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相关概念视频

Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

99
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...
99
Plastic Behavior01:21

Plastic Behavior

198
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
198
Residual Stresses in Bending01:18

Residual Stresses in Bending

176
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
176

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相关实验视频

Updated: Jul 7, 2025

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
12:04

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

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在阴性弹性体中的表面不稳定性

Morgan Barnes1, Fan Feng1, John S Biggins1

  • 1Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom.

Physical review letters
|December 22, 2023
PubMed
概括
此摘要是机器生成的。

液晶弹性体 (LCE) 经历了大量的收缩. 研究人员发现,在冷却过程中紧LCE诱导了表面地形,从软模式创建了一个独特的交叉切割模式.

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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Forming, Confining, and Observing Microtubule-Based Active Nematics
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相关实验视频

Last Updated: Jul 7, 2025

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12:04

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9.0K
Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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科学领域:

  • 材料科学 材料科学 材料科学
  • 软物质物理学 软物质物理学
  • 聚合物科学 聚合物科学

背景情况:

  • 液晶弹性体 (LCE) 是一种对刺激有反应的材料,以大,可逆收缩而闻名.
  • 它们的相位过渡与软模式和潜在的微观结构不稳定性有关.
  • 了解这些不稳定性对于设计基于LCE的执行器和设备至关重要.

研究的目的:

  • 在受限制的冷却条件下,研究平面LCE板块中的微结构不稳定性.
  • 描述由此产生的表面地形及其与材料性质的关系.
  • 阐明观察到的不稳定性的潜在机制.

主要方法:

  • 在实验中将一个平面的LCE加热到同otropic阶段,紧一个表面,然后再冷却回去nematic阶段.
  • 数字计算非理想的LCE能量函数的微结构放松.
  • 使用线性稳定性分析来确定不稳定的性质.

主要成果:

  • 受约束的LCE冷却导致表面不稳定和地形的形成.
  • 观察到的地形具有与LCE板块厚度相当的振幅和波长.
  • 线性稳定性分析揭示了具有斜波向量的无尺度不稳定性.
  • 不稳定性达到顶点,无底,无歇斯底里交叉切割模式,由低压软模式组成.

结论:

  • 这项研究展示了一种新的方法,通过控制冷却和紧来诱导LCE中的微结构模式.
  • 由此产生的交叉切割模式是受约束的LCE软模式的独特后果.
  • 这些发现提供了软物质不稳定性和LCE行为机制的见解.