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Stress Concentrations01:13

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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.
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Stress Concentrations01:24

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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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Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
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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.
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Estimating Group Stress Level by Measuring Body Motion.

Satomi Tsuji1, Nobuo Sato1, Koji Ara1

  • 1Hitachi, Ltd., Research & Development Group, Tokyo, Japan.

Frontiers in Psychology
|April 19, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to measure employee stress using body motion data. It offers a practical, quantitative approach for companies to monitor workforce well-being and inform management strategies.

Keywords:
body motionduration distributiongroup stress levelorganizational managementwearable sensorwork satisfaction

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Area of Science:

  • Occupational Health
  • Data Science
  • Organizational Psychology

Background:

  • Employee stress is critical for corporate growth and risk management.
  • Current methods like annual employee satisfaction surveys (ESs) lack quantitative and continuous data collection.
  • A frequent, low-burden measurement for group stress is needed.

Purpose of the Study:

  • To propose and evaluate a practical method for frequently measuring group employee stress levels.
  • To assess the effectiveness of using body motion data for stress estimation.
  • To provide a quantitative management guide for companies.

Main Methods:

  • Utilized body motion data to analyze activity/rest duration distributions.
  • Developed estimation models on both individual and group bases.
  • Evaluated four combinations of modeling approaches.

Main Results:

  • Group-based modeling using activity duration distribution yielded optimal results.
  • Achieved a high correlation (r = 0.928, p < 0.001) with a low estimation error (1.36%).
  • Demonstrated the feasibility of quantitative and easy stress assessment.

Conclusions:

  • The proposed method enables quantitative and easy assessment of employee stress.
  • This approach can serve as a valuable management guide for companies.
  • Body motion data offers a practical solution for continuous organizational health monitoring.