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08:36
Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
Published on: November 30, 2017
Post-yield relaxation behavior of bovine cancellous bone
Travis A Burgers1, Roderic S Lakes, Sylvana García-Rodríguez
1Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA.
Journal of Biomechanics
|September 22, 2009
Summary
Bovine cancellous bone exhibits non-linear viscoelastic/viscoplastic behavior in the plastic region. Its relaxation modulus is dependent on strain and apparent density, following a power law relationship.
Area of Science:
- Biomechanics
- Materials Science
- Orthopedic Research
Background:
- Cancellous bone exhibits complex mechanical properties.
- Understanding its viscoelastic/viscoplastic behavior is crucial for bone tissue engineering and implant design.
Purpose of the Study:
- To investigate the relaxation behavior of bovine cancellous bone at post-yield strains.
- To determine the relationship between relaxation modulus, strain, and apparent density.
Main Methods:
- Relaxation tests were performed on 15 bovine cancellous bone specimens.
- Stress and strain were measured over time to determine the relaxation modulus.
- Power law regression was applied to model the relaxation modulus data.
Main Results:
- The relaxation modulus was found to be a function of strain, indicating non-linear viscoelastic/viscoplastic behavior.
- A power law relationship was established between the multiplicative constant and both strain and apparent density (p<0.0005).
- The power coefficient was related to strain (p<0.0005) but not apparent density.
Conclusions:
- Bovine cancellous bone exhibits non-linear viscoelastic/viscoplastic characteristics in the plastic deformation region.
- The relaxation modulus is strain-dependent and can be modeled using a power law.
- Apparent density influences the multiplicative constant in the power law model, highlighting its importance in bone mechanics.
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