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Problem Solving on Stress and Strain01:22

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Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
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循环切割的合体凝:结构变化和延迟故障时间.

Himangsu Bhaumik1, James E Hallett2, Tanniemola B Liverpool3

  • 1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.

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概括
此摘要是机器生成的。

循环切割的合体凝改变了它们的结构和机械性能. 根据剪切条件,凝可以变得更符合规则 (厚度) 或更硬 (应变硬化),影响其稳定性.

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科学领域:

  • 体科学是一种体科学.
  • 软物质物理学 软物质物理学
  • 材料科学是一种材料科学.

背景情况:

  • 体凝是复杂的液体,在食品,化品和药品中具有应用.
  • 了解它们对机械应力的反应对于加工和稳定性至关重要.

研究的目的:

  • 为了研究循环剪切下合凝的结构和机械变化.
  • 探索剪切历史与凝行为之间的关系,包括厚度变异和应变硬化.

主要方法:

  • 关于合物-聚合物混合物凝的实验研究.
  • 计算机模拟使用模型凝-前身.
  • 结构参数的分析 (拓集群分类,债券顺序参数,孔径大小分布).
  • 机械反应分析 (压力,消散率,爬行流).

主要成果:

  • 循环剪切会诱导凝的结构演变和孔隙大小的增加.
  • 随着应变幅度的增加,观察到从弹性到塑性行为的交叉.
  • 根据参数,凝表现出粗性 (增加合规性) 和应变硬化 (减少合规性).
  • 预剪切的凝在持续的剪切应力下显示出更高的稳定性.
  • 不同类型的结构特征由循环剪切打印,影响响应方向.

结论:

  • 循环剪切显著改变了体凝的微观结构和质学.
  • 观察到的厚度变异和应变硬化是对剪切历史的关键反应.
  • 循环剪切引入的异位性在凝稳定性和流动行为中起着关键作用.