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A simple multi-specimen apparatus for fixed stress fatigue testing.

H Y Kim1, T R Marrero, H K Yasuda

  • 1Department of Chemical Engineering, University of Missouri-Columbia, Columbia, Missouri 65211, USA.

Journal of Biomedical Materials Research
|July 9, 1999
PubMed
Summary

A new multi-specimen fatigue testing apparatus significantly reduces testing time by analyzing 10 samples simultaneously. This validated method is ideal for low-frequency, low-stress fatigue tests, such as those for bone cements.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biomedical Engineering

Background:

  • Fatigue testing is crucial for material durability assessment.
  • Traditional fatigue tests are time-consuming, especially for low-frequency, low-stress applications.
  • Developing efficient testing methods is essential for materials like bone cement.

Purpose of the Study:

  • To design and validate a multi-specimen fatigue testing apparatus.
  • To reduce the overall time required for fatigue testing.
  • To assess the apparatus's suitability for materials requiring low-frequency, low-stress testing.

Main Methods:

  • A novel apparatus capable of testing 10 specimens concurrently was designed and constructed.
  • Specimens were subjected to stress-controlled flexural fatigue tests using weights.

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  • Performance was validated against a commercial three-point bending fatigue tester.

    • Main Results:

    • The new apparatus yielded stress versus number of cycles to failure curves similar to a commercial apparatus for poly(methylmethacrylate) (PMMA).
    • Fatigue test results for acrylic bone cement showed good agreement between the new and commercial apparatus.
    • The apparatus demonstrated reliability and feasibility in reducing test durations.

    Conclusions:

    • The multi-specimen fatigue testing apparatus is a reliable and efficient alternative to conventional methods.
    • It significantly reduces testing time, particularly for materials like bone cements requiring prolonged low-frequency, low-stress fatigue analysis.
    • The validated apparatus offers a valuable tool for material characterization and durability studies.