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A numerical-experimental method for a mechanical characterization of biological materials
C W Oomens1, M R van Ratingen, J D Janssen
1Eindhoven University of Technology, The Netherlands.
Journal of Biomechanics
|April 1, 1993
Summary
This study introduces a novel method for determining material parameters in biological tissues. It utilizes digital imaging and finite element analysis to measure non-homogeneous strain, overcoming limitations of traditional techniques.
Area of Science:
- Materials Science
- Biomechanics
- Computational Mechanics
Background:
- Traditional methods for material parameter determination rely on homogeneous stress/strain, which is problematic for biological materials.
- Biological materials exhibit inherent inhomogeneities and are difficult to manufacture into standardized test specimens.
Purpose of the Study:
- To present a new approach for identifying material parameters in biological tissues.
- To overcome the challenges associated with obtaining homogeneous strains and manufacturing samples from biological materials.
Main Methods:
- Digital image correlation (DIC) for measuring non-homogeneous strain distributions.
- Finite element modeling (FEM) to simulate material behavior.
- Minimum-variance estimation to identify material parameters.
Main Results:
- The proposed method successfully measures non-homogeneous strain distributions.
- Five material parameters were identified from a single experiment on an orthotropic elastic membrane.
- The technique was validated using experiments on a woven and calendered textile membrane.
Conclusions:
- The developed method offers a viable alternative for characterizing the mechanical properties of inhomogeneous biological materials.
- This approach reduces the need for complex sample preparation and overcomes limitations of traditional testing.
- It enables accurate material parameter identification using experimental data and computational modeling.