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Related Concept Videos

Components of Stress01:23

Components of Stress

350
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
350
General State of Stress01:21

General State of Stress

417
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...
417
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

700
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
700
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

435
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
435
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

334
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...
334
Measurements of Strain01:27

Measurements of Strain

2.4K
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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Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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6-Axis Stress Tensor Sensor Using Multifaceted Silicon Piezoresistors.

Kentaro Noda1, Jian Sun2, Isao Shimoyama1

  • 1Department of Intelligent Robotics, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan.

Micromachines
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

A novel MEMS tensor sensor measures minute stress changes for early fatigue detection in materials. This small, highly sensitive device can detect all nine tensor components, enhancing structural safety and preventing accidents.

Keywords:
6-axis tensor measureMEMSSi-piezoresistormultidimensional doping

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Tensor sensors detect internal stress changes, enabling early detection of material fatigue and accident prevention.
  • Applications include structural health monitoring in civil engineering.
  • A need exists for compact sensors capable of measuring all nine tensor components.

Purpose of the Study:

  • To develop a microelectromechanical systems (MEMS) tensor sensor.
  • To enable measurement of all nine tensor components for comprehensive stress analysis.
  • To create a compact sensor for embedded applications.

Main Methods:

  • Fabrication of a tensor sensor using MEMS processes, incorporating piezoresistive beams and a cantilever.
  • Sensor dimensions: 2.0 mm x 2.0 mm x 0.3 mm.
  • Embedding the sensor chip within a polydimethylsiloxane (PDMS) elastic body for calibration and testing.

Main Results:

  • Successful development of a compact tensor sensor.
  • Demonstrated capability to measure 6-axis normal and shear Cauchy stresses.
  • Achieved measurement sensitivity for stresses with magnitudes as low as 5 kPa.

Conclusions:

  • The developed MEMS tensor sensor can accurately measure multi-axis stresses.
  • Its compact size and sensitivity make it suitable for embedded structural health monitoring.
  • This technology has the potential to significantly improve safety by predicting material fatigue.