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相关概念视频

Measurements of Strain01:27

Measurements of Strain

2.5K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.5K
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

545
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
545
General State of Stress01:21

General State of Stress

617
The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...
617
Stress Concentrations01:13

Stress Concentrations

605
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
605
Stress Concentrations01:24

Stress Concentrations

632
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
632
Stresses in a Shaft01:18

Stresses in a Shaft

834
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
834

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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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使用固态量子传感器测量化CVD钻石中的应力张量.

T Tsuji1, S Harada2,3, T Teraji4

  • 1International Center for Young Scientists, National Institute for Materials Science, Tsukuba, Ibaraki, Japan.

Science and technology of advanced materials
|September 8, 2025
PubMed
概括
此摘要是机器生成的。

使用光学检测磁共振 (ODMR) 测量了化化学蒸汽沉积 (CVD) 钻石薄膜中的残余应力. 兴奋剂诱导了压力压力,导致钻石膜的体积减少.

关键词:
这是一个CVD钻石.在NV中心NV中心.的化物被使用了.压力就是压力,压力就是压力.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 钻石技术 钻石技术 钻石技术

背景情况:

  • 剩余应力对钻石薄膜的性能和性能产生重大影响.
  • 兴奋剂是一种常见的技术,用于修改钻石的电子和光学特性.
  • 了解钻石膜中的应力对于电子和光子学中的应用至关重要.

研究的目的:

  • 量化化 (001) 化学蒸汽沉积 (CVD) 钻石薄膜中的残余应力张量.
  • 为了研究钻石薄膜内的应力分布的空间变化.
  • 为了确定兴奋剂对钻石薄膜应力状态和体积的影响.

主要方法:

  • 利用空 (NV) 中心的光学检测磁共振 (ODMR) 来测量应力张量组件.
  • 使用共聚焦显微镜设置进行空间分辨应力映射.
  • 分析了ODMR光谱中的变化,以推断应力值.

主要成果:

  • 其余应力张量组件 (σxy, σyz, σzx, σxx+σyy+σzz) 确定为分别大约0.077, -0.39, -0.67和1.52 GPa.
  • 在CVD钻石薄膜的增长方向 (z方向) 中确定了显著的剪切应力.
  • 观察到压力轴应力 (σxx+σyy+σzz),导致体积减少0.073%.

结论:

  • 在CVD钻石薄膜中使用兴奋剂会导致压力应激状态.
  • 观察到的压力应力和随后的体积减少归因于的存在.
  • 这些发现为高级应用提供了对合钻石薄膜机械行为的关键见解.