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相关概念视频

Characteristics of Dry Friction01:21

Characteristics of Dry Friction

1.0K
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
1.0K
Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

365
Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
365
Frictional Force01:07

Frictional Force

10.3K
When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
10.3K
Dry Friction01:30

Dry Friction

1.0K
Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
1.0K

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相关实验视频

Updated: Mar 8, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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强大的宏观结构超度的观察.

Minhao Han1, Deli Peng1,2, Dinglin Yang3,4

  • 1Center of Double Helix, Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China.

Physical review letters
|March 6, 2026
PubMed
概括

研究人员使用石墨接触器在宏观尺度上实现了结构超度 (SSL). 这一突破使得在更大的系统中几乎可以无摩擦地滑动,克服了这种极端现象之前的尺寸限制.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 部落学 (tribology) 是一个学科.
  • 纳米技术纳米技术

背景情况:

  • 结构超度 (SSL) 提供了几乎无摩擦和无磨损的滑动.
  • 以前,SSL仅限于微/纳米级接触和低负载.
  • 扩展限制阻碍了SSL的宏观应用.

研究的目的:

  • 为了证明强大的宏观结构超性.
  • 为了扩展SSL超越微量接触和低负载.
  • 为了研究宏观SSL的通用性.

主要方法:

  • 使用的亚毫米石墨接触.
  • 测试了广泛的正常负荷范围 (1mN到0.5N).
  • 检查的石墨/MoS2接口.

主要成果:

  • 在单个石墨接触中实现了宏观级SSL.
  • 观察到的摩擦系数在零左右波动,达到~10^-6.
  • 在广泛的负载范围内展示了SSL,包括负摩擦系数.
  • 在石墨/MoS2接口中发现了类似的行为,表明了可概括性.

结论:

  • 宏观级SSL可以在平面层材料中实现和通用.
  • 推翻了SSL的长期扩展限制.
  • 建立宏观级的SSL作为先进机械和电机械系统的平台.