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相关概念视频

Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

126
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...
126
Residual Stresses in Bending01:18

Residual Stresses in Bending

213
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...
213
Elasticity in Concrete01:20

Elasticity in Concrete

118
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...
118
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

301
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
301
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

427
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...
427
Plastic Behavior01:21

Plastic Behavior

230
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...
230

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相关实验视频

Updated: Jul 27, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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模拟弹性体压缩:探索十个构成方程

Stanisław Kut1, Grażyna Ryzińska1

  • 1Department of Materials Forming and Processing, Rzeszow University of Technology, al. Powstańców Warszawy 8, 35-959 Rzeszów, Poland.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
概括
此摘要是机器生成的。

本研究评估了超弹性聚氨弹性体的构成方程. 使用双轴拉伸试验 (变体II) 确定材料常量被证明是最有效的准确数值建模.

关键词:
这是一个FEM模拟.构成方程的组成方程.弹性弹性体弹性体是什么弹性体测试试验 弹性体测试实验 实验 实验 实验 实验

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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算力学 计算力学 计算力学
  • 聚合物物理 聚合物物理

背景情况:

  • 像聚氨弹性体这样的超弹性材料在工程应用中至关重要.
  • 准确的数值建模它们在负载下的行为对于设计至关重要.
  • 构成方程描述了材料的反应,但它们的有效性取决于参数的确定.

研究的目的:

  • 评估超弹性天体的十个构成方程的性能.
  • 为了研究不同的方法来确定物质常数的影响.
  • 为了建模90 Sh A聚氨弹性体的第一个压缩负载周期.

主要方法:

  • 超弹性材料行为的数值建模.
  • 使用四种变体确定材料常数:单轴拉伸试验 (I),双轴拉伸试验 (II),平面拉伸试验 (III) 和组合试验 (IV).
  • 对数值模型结果的实验验证.

主要成果:

  • 建模结果对所选择的构成方程非常敏感,当常数来自单轴拉伸试验 (变量I) 时.
  • 使用双轴拉伸试验 (变量II) 确定材料常数在所有评估的构成方程中产生了最有利的结果.
  • 变种IV (所有测试) 也表现良好,但变种II提供了更有效的方法.

结论:

  • 确定材料常数的方法极大地影响了超弹性材料建模的准确性.
  • 双轴拉伸试验为聚氨弹性体的构成模型中的参数识别提供了坚实的基础.
  • 精心选择构成方程和参数确定方法对于可靠的数值模拟至关重要.