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Identification of linear viscoelastic constitutive models
J C Sarron1, C Blondeau, A Guillaume
1Délégation Générale pour l'Armement. Direction des Systèmes de Forces et de la Prospective, Service Technique des Technologies Communes, Département Technique des Sciences de l'Homme (DGA/DSP/STTC/DT-SH), Paris, France.
Journal of Biomechanics
|May 16, 2000
Summary
Fighter pilots may lose consciousness due to brain mechanical stresses from acceleration. This study models the brain
Area of Science:
- Biomechanics
- Neuroscience
- Computational mechanics
Background:
- Accelerations can induce significant mechanical stresses within the brain.
- Understanding these stresses is crucial for fighter pilot safety and preventing loss of consciousness.
- The brain's complex, multi-domain structure presents challenges in mechanical analysis.
Purpose of the Study:
- To model the brain as a multi-domain structure.
- To identify constitutive law parameters for each brain domain.
- To analyze stress levels in the brain under acceleration using finite element analysis.
Main Methods:
- Modeling the brain as a multi-domain, isotropic, homogeneous structure with linear viscoelastic behavior.
- Utilizing the finite element method (FEM) for analysis.
- Identifying constitutive laws using external node displacements, disregarding internal interface displacements.
Main Results:
- Hypergravity loading and observed strain rates suggest quasi-static behavior of the brain.
- A general procedure was developed to characterize multi-domain structures.
- The method demonstrated reliability and effectiveness in validation examples.
Conclusions:
- The developed finite element method can effectively analyze mechanical stresses in the multi-domain brain structure.
- The findings contribute to understanding the biomechanics of G-force effects on the brain.
- This research provides a framework for evaluating brain injury risks under extreme acceleration.