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Related Concept Videos

Three-Dimensional Force System01:30

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Updated: Oct 30, 2025

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A 3D-Printed Soft Fingertip Sensor for Providing Information about Normal and Shear Components of Interaction Forces.

Gerjan Wolterink1,2, Remco Sanders1, Bert-Jan van Beijnum2

  • 1Robotics and Mechatronics Group (RAM), University of Twente, 7500 AE Enschede, The Netherlands.

Sensors (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

This study developed a flexible, 3D-printed sensor for fingertip force detection, improving rehabilitation therapy by mimicking natural tissue compliance and preserving touch sensation.

Keywords:
3D-printingTPUconductivefingertip sensorflexible, soft, shear force

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Robotics

Background:

  • Accurate fingertip force sensing is crucial for rehabilitation and assessment.
  • Existing force sensors lack compliance, hindering natural touch sensation.

Purpose of the Study:

  • To develop and characterize a flexible, 3D-printed piezoresistive sensor for fingertip normal and shear force detection.
  • To create a sensor that integrates with fingertip tissue, preserving natural sensation.

Main Methods:

  • Developed a fully 3D-printed piezoresistive sensor using conductive TPU.
  • Evaluated two prototypes using finite element modeling (FEM) and a custom measurement setup.
  • Characterized the strain-resistance relationship of the conductive TPU.

Main Results:

  • The sensor demonstrated partial separation of normal and shear force components.
  • FEM analysis indicated sensor output is influenced by geometry and strain gauge placement.
  • The conductive TPU exhibited a negative gauge factor, potentially causing non-linear sensor behavior.

Conclusions:

  • The developed 3D-printed sensor offers a compliant alternative for fingertip force sensing.
  • Further research is needed to address non-linearities and optimize sensor design for clinical applications.