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Related Experiment Videos

Early stage-stress relaxation in compact bone.

T Goto1, N Sasaki, K Hikichi

  • 1Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan.

Journal of Biomechanics
|March 2, 1999
PubMed
Summary

An empirical equation for bone stress relaxation showed limitations at short times. New relaxation processes were identified in compact bone below 2-3 seconds, requiring further investigation.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Bone Physiology

Background:

  • Bone exhibits viscoelastic properties, crucial for understanding its mechanical behavior.
  • Existing empirical models, like the KWW and Debye relaxation equation, are used to describe stress relaxation in bone.

Purpose of the Study:

  • To evaluate the applicability of an established empirical equation for bone stress relaxation.
  • To investigate the early-stage stress relaxation behavior of compact bone (0-10 seconds).

Main Methods:

  • Experimental investigation of stress relaxation in compact bone up to 10 seconds post-strain application.
  • Fitting measured data to the empirical equation: E(t) = E0{A1exp[-(t/tau1)beta]+A2exp(-t/tau)}.
  • Analysis of residual deviations to identify inconsistencies at short time scales.

Main Results:

  • The empirical equation generally provided a good fit to the relaxation modulus data.
  • Inconsistencies were observed between the empirical equation and measured data in the short-time response region (t < 2-3 s).
  • Residual deviation increased as the initial time point for regression analysis decreased.

Conclusions:

  • The empirical equation has limitations in accurately describing the initial stress relaxation behavior of compact bone.
  • A previously undescribed relaxation mechanism likely exists in compact bone within the first 2-3 seconds.
  • Material properties of bone may contribute to the observed short-time relaxation anomalies.

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