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相关概念视频

Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...

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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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聚胺的高机械行为 6.6:实验和建模.

Paul Wetzel1,2, Anna Katharina Sambale2, Kai Uhlig2

  • 1Component Design, Reliability and Validation Polymers, Corporate Sector Research and Advance Engineering, Robert Bosch GmbH, Robert-Bosch-Campus 1, 71272 Renningen, Germany.

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|August 26, 2023
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概括

聚胺6.6的吸水会导致显著的湿透胀,并降低机械性能,如刚性和强度. 一个合模型预测了这些变化,帮助材料设计适用于潮湿的环境.

关键词:
在CME中,CME是CME.在PA6666中使用.扩散扩散是一种扩散.由潮湿引起的胀.塑化 塑化 塑化水的吸收水分.

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A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
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Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物工程 聚合物工程
  • 计算力学 计算力学 计算力学

背景情况:

  • 聚胺6.6 (PA66) 是一种广泛使用的工程热塑性塑料.
  • 水的吸收显著影响PA66的物理和机械性能.
  • 了解这些影响对于预测不同湿度下的材料性能至关重要.

研究的目的:

  • 为了研究PA66.6的吸水,湿透膨胀和机械性质变化.
  • 开发和验证一个顺序合模型来预测湿度诱导的影响.
  • 分析注射成型方向对膨胀行为的影响.

主要方法:

  • 在注射成型的PA66标本上进行吸附和膨胀实验.
  • 在不同的条件状态下进行热分析 (例如,DSC) 和机械拉力测试.
  • 开发一种非线性扩散模型,加上结合度依赖性质和"差距"温度概念的机械模拟.

主要成果:

  • 吸水导致玻璃过渡温度下降,硬度和强度显著降低.
  • 湿透性胀是异构的,并且取决于注塑过程中化的流动方向.
  • 结合模型成功地预测了当地的水分度,胀和应激应变行为.

结论:

  • 水的塑化显著改变了PA66的热力学行为.
  • 开发的模型提供了一个强大的工具来模拟PA66.6中的水分效应.
  • 精确预测胀和机械性能变化对于在潮湿条件下可靠的PA66应用至关重要.