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Related Experiment Videos

Creep fracture in bones with different stiffnesses.

M Mauch1, J D Currey, A J Sedman

  • 1Department of Biology, University of York, U.K.

Journal of Biomechanics
|January 1, 1992
PubMed
Summary

Bone fracture toughness varies with material properties. Less mineralized bone, like red deer antler, fractures slower than highly mineralized bone, challenging current cumulative damage models.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Skeletal Biology

Background:

  • The cumulative-damage model by Caler and Carter is widely used to predict bone fracture.
  • Understanding variations in bone fracture time is crucial for skeletal health research.

Purpose of the Study:

  • To investigate the time to fracture in bones with differing Young's moduli (bovine bone vs. red deer antler).
  • To assess the implications of these differences for the Caler and Carter cumulative-damage model of bone fracture.

Main Methods:

  • Creep fracture experiments were conducted on bovine bone and red deer antler.
  • Normalized stress and stress alone were used as explanatory variables.
  • Strain was analyzed as a key determinant of fracture time.

Main Results:

  • Antler exhibited significantly longer fracture times compared to bovine bone at equivalent normalized stress levels.
  • The relationship between fracture time and stress diminished when stress alone was considered.
  • Less mineralized bone (antler) showed slower damage accumulation rates at high strains (>1%) than more mineralized bone (bovine).

Conclusions:

  • Strain, not just stress, is critical for determining bone fracture time within a specific bone type.
  • The cumulative-damage model may require adjustments to account for variations in bone mineralization and its effect on damage accumulation.
  • Material properties, specifically mineralization, significantly influence bone's resistance to creep fracture.

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