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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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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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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...
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Stress-Strain Diagram01:10

Stress-Strain Diagram

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A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Method of Sections: Problem Solving II01:30

Method of Sections: Problem Solving II

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Consider an arbitrary truss structure composed of diagonal, vertical, and horizontal members fixed to the wall. To calculate the force acting on members CB, GB, and GH, method of sections can be used. The loads and lengths of the horizontal and vertical members are known parameters, as shown in the figure.
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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
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Related Experiment Video

Updated: Nov 21, 2025

The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees
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A method for measuring the forces acting on a tree trunk using strain gauges.

Ayana Miyashita1, Satoru Suzuki1

  • 1Center for Forest Damage and Risk Management, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Ibaraki, Japan.

Plos One
|January 15, 2021
PubMed
Summary

Researchers developed a novel method using four strain gauges to precisely measure wind force (F), its distribution centroid (C), and direction (D) on tree trunks. This technique offers accurate field measurements even with uneven surfaces and misaligned sensors.

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Last Updated: Nov 21, 2025

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Area of Science:

  • Arboriculture
  • Biomechanical Engineering
  • Environmental Science

Background:

  • Wind exerts dynamic forces on trees, influencing their stability and growth.
  • Accurate measurement of wind force magnitude, distribution, and direction is crucial for ecological and structural studies.

Purpose of the Study:

  • To develop and validate a method for simultaneously measuring wind force (F), centroid (C), and direction (D) on tree trunks.
  • To overcome challenges of sensor alignment and material irregularities in field measurements.

Main Methods:

  • Utilized four strain gauges attached to the tree trunk.
  • Estimated force (F) and centroid (C) from bending moments at two stem positions.
  • Estimated force direction (D) using sensor outputs at different radial positions.
  • Developed a novel calibration method to determine strain gauge position and elasticity after attachment.

Main Results:

  • Achieved estimation errors of less than 2% for both distributed and circumferential tensile loads.
  • Demonstrated precise estimation of F, C, and D even with uneven wood surfaces and non-ideal strain gauge alignment.
  • Validated the method on wood poles and conifer saplings under various loading conditions.

Conclusions:

  • The developed method provides accurate and reliable field measurements of wind forces on trees.
  • This technique is advantageous for ecological research, forestry, and structural assessments of trees under wind loads.