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Investigating Stress-relaxation and Failure Responses in the Trachea
Published on: October 18, 2022
Human cervical spine ligaments exhibit fully nonlinear viscoelastic behavior.
Kevin L Troyer1, Christian M Puttlitz
1Colorado State University, Ft. Collins, CO, USA.
Acta Biomaterialia
|September 14, 2010
Summary
Human spinal ligaments exhibit complex viscoelastic properties. A fully nonlinear viscoelastic model is necessary to accurately represent their behavior during daily activities.
Area of Science:
- Biomechanics
- Biomaterials Science
- Spinal Anatomy
Background:
- Spinal ligaments are crucial for stability and motion.
- These tissues display time-dependent viscoelastic behavior under load.
- Accurate modeling requires understanding their viscoelasticity.
Purpose of the Study:
- To determine the viscoelastic behavior of human lower cervical spine ligaments.
- To assess the suitability of linear, quasi-linear, and fully nonlinear viscoelastic models.
- To inform the development of computational spine models.
Main Methods:
- Cyclic loading and stress relaxation experiments were performed.
- Multiple physiological loading rates (frequencies) and strain amplitudes were used.
- Investigated the anterior longitudinal ligament, posterior longitudinal ligament, and ligamentum flavum.
Main Results:
- Ligament properties depended on both strain amplitude and frequency.
- Strain amplitude-dependent behavior invalidated linear viscoelastic models.
- Stress relaxation curves varied significantly with strain magnitude, precluding QLV models.
Conclusions:
- A fully nonlinear viscoelastic formulation is required for accurate modeling of these spinal ligaments.
- This finding is essential for predicting time-dependent spine behavior.
- Informs biomechanical modeling for activities of daily living.
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