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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

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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...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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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...
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General State of Stress01:21

General State of Stress

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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...
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Stress Concentrations01:13

Stress Concentrations

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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...
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Stresses in a Shaft01:18

Stresses in a Shaft

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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...
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Updated: Jan 18, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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Measuring the stress tensor in nitrogen-doped CVD diamond using solid-state quantum sensor.

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
Summary
This summary is machine-generated.

Residual stress in nitrogen-doped chemical vapor deposition (CVD) diamond films was measured using optically detected magnetic resonance (ODMR). Nitrogen doping induced compressive stress, causing a volume decrease in the diamond film.

Keywords:
CVD diamondNV centernitrogen dopestress

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Diamond Technology

Background:

  • Residual stress significantly impacts the properties and performance of diamond films.
  • Nitrogen doping is a common technique to modify diamond's electronic and optical characteristics.
  • Understanding stress in diamond films is crucial for applications in electronics and photonics.

Purpose of the Study:

  • To quantify the residual stress tensor in nitrogen-doped (001) chemical vapor deposition (CVD) diamond films.
  • To investigate the spatial variation of stress distribution within the diamond film.
  • To determine the influence of nitrogen doping on the stress state and volume of the diamond film.

Main Methods:

  • Utilized optically detected magnetic resonance (ODMR) of nitrogen-vacancy (NV) centers to measure the stress tensor components.
  • Employed a confocal microscopy setup for spatially resolved stress mapping.
  • Analyzed shifts in ODMR spectra to deduce stress values.

Main Results:

  • The residual stress tensor components (σxy, σyz, σzx, σxx+σyy+σzz) were determined to be approximately 0.077, -0.39, -0.67, and 1.52 GPa, respectively.
  • Identified significant shear stress in the growth direction (z-direction) of the CVD diamond film.
  • Observed compressive axial stress (σxx+σyy+σzz) leading to a 0.073% volume reduction.

Conclusions:

  • Nitrogen doping in CVD diamond films results in a compressive stress state.
  • The observed compressive stress and subsequent volume decrease are attributed to the presence of nitrogen.
  • These findings provide critical insights into the mechanical behavior of doped diamond films for advanced applications.