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Computer-controlled mechanical testing machine for small samples of biological viscoelastic materials.

R M Aspden1, T Larsson, R Svensson

  • 1Department of Medical and Physiological Chemistry, University of Lund, Sweden.

Journal of Biomedical Engineering
|November 1, 1991
PubMed
Summary

Characterizing viscoelastic materials like articular cartilage requires precise testing. This study details a computer-controlled apparatus for accurate mechanical property measurements, enhancing material science research.

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Area of Science:

  • Biomaterials Science
  • Mechanical Engineering
  • Orthopedic Research

Background:

  • Viscoelastic materials exhibit time-dependent mechanical properties, necessitating comprehensive testing for full characterization.
  • Accurate measurement of mechanical properties in materials like articular cartilage requires precise control over applied loads, displacements, and their rates.

Purpose of the Study:

  • To describe a novel apparatus for measuring the viscoelastic properties of articular cartilage in compression.
  • To demonstrate the adaptability of the apparatus for small samples requiring precise displacement control.

Main Methods:

  • Utilized a computer-controlled system for precise management of loads, displacements, and testing rates.
  • Employed an IBM-type microcomputer to control a stepper motor and ball screw mechanism.

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  • Achieved positional accuracy of approximately 1 micron for controlled displacements.

    • Main Results:

    • The developed apparatus allows for accurate measurement of viscoelastic properties in compression.
    • The system demonstrated high precision in controlling small displacements, crucial for analyzing materials like articular cartilage.
    • Computer control facilitated efficient data acquisition and analysis.

    Conclusions:

    • The described apparatus is effective for characterizing the time-dependent mechanical behavior of viscoelastic materials, particularly articular cartilage.
    • The system's precision and adaptability make it a valuable tool for small-sample mechanical testing in material science and biomechanics.
    • Computer-automated testing significantly improves the accuracy and efficiency of viscoelastic property measurements.