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相关概念视频

Logarithmic Differentiation01:28

Logarithmic Differentiation

102
When a car’s weight and driving forces act on a tire, they impose an external load on the rubber material. This load is resisted internally by forces distributed throughout the tire structure, which are defined as stress. The resulting deformation of the rubber due to this stress is quantified as strain. The relationship between stress and strain governs how the tire deforms under load and is central to understanding its mechanical response during operation.Rubber exhibits a nonlinear...
102
Plastic Behavior01:21

Plastic Behavior

679
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...
679
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

665
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.
665
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

664
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...
664
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

460
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...
460

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相关实验视频

Updated: Mar 15, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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作为可转移的结构描述符的捆绑:将MD衍生界面缩放连接到连续增强模型.

Yancai Sun1,2,3,4, Wenzhong Deng2,3, Haoran Wang5

  • 1College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China.

Polymers
|March 14, 2026
PubMed
概括

这项研究使用多尺度建模将分子结构与弹性体强化联系起来. 分子动力学模拟提供了结构洞察力,改善了宏观预测,减少了材料行为建模中的错误.

关键词:
动态机械分析机械分析分数的麦克斯韦尔模型.接口缩放的扩展.分子动力学分子动力学聚合物纳米复合材料 聚合物纳米复合材料流体学建模 流体学建模 流体学建模

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科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 计算化学计算化学

背景情况:

  • 填充弹性体显示低频功率规律储存模块 (G-prime).
  • 分子界面结构和宏观强化之间的定量联系尚未得到充分理解.
  • 现有的模型很难从分子细节中预测宏观性质.

研究的目的:

  • 建立分子界面结构和填充弹性体中的宏观强化之间的定量联系.
  • 开发一个分层的多层次框架,整合分子动力学 (MD) 和动态机械分析 (DMA).
  • 改进从分子级信息中预测弹性体机械性能.

主要方法:

  • 利用一个分层的多尺度框架,结合粗粒度分子动力学 (MD) 和动态机械分析 (DMA).
  • MD模拟生成了结构描述符,包括边界层缩放关系.
  • 采用单相分数麦克斯韦模型和双相模型,分别分析EPDM和PC/ABS数据.
  • 开发了一个用于跨度预测的政权分区桥梁模型,结合了MD衍生的基线.

主要成果:

  • MD模拟提供了可转移的结构描述符,而不是直接的类风学预测.
  • 对于较大的数据集 (PC/ABS,n=952),双相模型是最受欢迎的.
  • 调节分区桥梁模型通过结合MD结构先验并解决未捕获的放松物理学,显著降低了预测误差 (7.3%).
  • 线性-粘弹性约束改善了非线性预测,减少了87%的胀误差.

结论:

  • 开发的多尺度框架成功地将分子界面结构与宏观弹性体强化联系起来.
  • 这种方法提高了预测材料属性和行为的准确性.
  • 这些发现为设计基于分子架构的定制宏观性质的弹性体提供了一条途径.