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Related Concept Videos

Load along a Single Axis01:29

Load along a Single Axis

482
In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
482
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

271
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

380
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
380
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

218
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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Machines: Problem Solving II01:30

Machines: Problem Solving II

466
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
466
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

361
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
361

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Sensor Integrated Load-Bearing Structures: Measuring Axis Extension with DIC-Based Transducers.

Nassr Al-Baradoni1, Peter Groche1

  • 1Institute for Production Engineering and Forming Machines, Technical University of Darmstadt, 64287 Darmstadt, Germany.

Sensors (Basel, Switzerland)
|July 2, 2021
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Summary
This summary is machine-generated.

This study introduces a new, affordable camera-based sensor for measuring multi-axis forces and torques in structures. The innovative design accurately captures 3D displacements using digital image correlation (DIC) for precise load analysis.

Keywords:
digital image correlationmulti-axis force/torque sensorsensor embedded structuressmart structures

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Optical Measurement Techniques

Background:

  • Accurate measurement of multi-axis forces and torques is crucial for structural health monitoring and performance analysis.
  • Existing sensor technologies can be expensive, complex, or limited in their ability to capture all displacement components.
  • Integrating sensors directly into load-bearing structures presents unique challenges for accuracy and cost-effectiveness.

Purpose of the Study:

  • To present a novel, cost-effective camera-based sensor concept for measuring multi-axis force/torque.
  • To enable integration of the sensor into metallic load-bearing structures.
  • To validate the sensor's accuracy in capturing 3D displacements and identifying all in- and out-of-plane components under various load conditions.

Main Methods:

  • A two-part light pattern (direct and mirrored beams) projected onto an imaging sensor.
  • Utilizing digital image correlation (DIC) to analyze displacements of defined features in a single image.
  • Prototyping and validation under uniaxial and combined multiaxial loading conditions.

Main Results:

  • Successful capturing of 3D displacements and identification of all in- and out-of-plane components under multiaxial load.
  • Measurement deviations ranged from 2.5% to 4.8% for uniaxial loads (Fx, Fy, Fz, Mz).
  • Deviations ranged from 2.5% to 10.43% for combined bending, torsion, and axial loads, with inaccuracies partly attributed to the sensor joint and eccentric loading.

Conclusions:

  • The developed camera-based sensor concept offers a viable and cost-effective solution for multi-axis force/torque measurement.
  • The DIC-based approach accurately quantifies structural deformation under complex loading scenarios.
  • Further refinement, particularly concerning the sensor-structure joint, could enhance measurement precision.