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相关概念视频

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

234
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
234
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

768
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
768
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

193
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
193
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

247
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
247

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用于低温执行器的形状记忆合金

Shunsuke Sato1, Hirobumi Tobe2, Kenichiro Sawada3

  • 1Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Japan.

Communications engineering
|July 16, 2025
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概括
此摘要是机器生成的。

新的Cu-Al-Mn形状记忆合金 (SMAs) 在冷温度 (50-270 K) 提供高启动应力和应变. 这些先进的SMA能够为太空望远镜提供机械热开关,从而推进低温技术.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 低温生化技术 低温生化技术

背景情况:

  • 执行器在机械系统中至关重要,但在冷温度下缺乏高性能.
  • 传统的形状记忆合金 (SMA) 具有有限的操作温度范围,接近室温.
  • 开发适用于极端寒冷环境的执行器对于先进技术至关重要.

研究的目的:

  • 在冷温度下研究Cu-Al-Mn合金的形状记忆效应和工作输出.
  • 设计和演示使用Cu-Al-Mn SMAs进行隔热的机械热开关.
  • 评估这些合金作为各种低温应用的低温执行器的潜力.

主要方法:

  • 对基于Cu-Al-Mn的合金进行拉伸测试,以评估形状记忆效应和工作输出.
  • 机械热开关原型的制造和测试.
  • 在低温条件下 (大约100K) 测试热开关的操作和性能评估.

主要成果:

  • --合金表现出显著的形状记忆效应,在广泛的冷范围 (50-270 K) 中具有高的工作输出.
  • 一个功能性的机械热开关在大约100K的温度下被成功演示.
  • 这些合金在零度以下的环境中显示出高启动应力和应变的前景.

结论:

  • Cu-Al-Mn SMA 是高性能冷执行器的可行候选者.
  • 这些合金可以为太空应用中的热管理解决方案做出重大贡献,例如红外望远镜.
  • 这些发现支持太空天文学,超导和液化气体行业技术的进步.