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Fracture in porous bone analysed with a numerical phase-field dynamical model
Jenny Carlsson1, Anna Braesch-Andersen2, Stephen J Ferguson3
1Solid Mechanics, Department of Materials Science and Engineering, Uppsala University, Sweden; Now at Cambridge University Engineering Department, Trumpington St., Cambridge, UK.
Journal of the Mechanical Behavior of Biomedical Materials
|January 13, 2023
Summary
Dynamic fracture models are essential for accurately simulating rapid bone fractures. Inertia effects at high load rates significantly alter fracture behavior compared to low load rates, necessitating dynamic analysis.
Area of Science:
- Biomechanics
- Materials Science
- Computational Modeling
Background:
- Human trabecular bone fracture is a complex phenomenon.
- Understanding rapid bone fracture is crucial for clinical applications.
- Existing quasi-static models may not fully capture dynamic fracture behaviors.
Purpose of the Study:
- To analyze rapid bone fracture using a dynamic phase-field fracture finite element model.
- To compare dynamic fracture behavior with quasi-static experimental and model results.
- To determine the necessity of dynamic models for high-rate bone fracture simulation.
Main Methods:
- Application of a dynamic phase-field fracture finite element model.
- Utilized high-resolution 3D computed tomography images of human trabecular bone.
- Contrasted model results with quasi-static experimental data and a quasi-static phase-field model.
Main Results:
- Experiments showed complex, stepwise crack evolution with arrests.
- Quasi-static model reasonably captured experimental fractures at low rates.
- Dynamic model revealed inertia effects at high rates, increasing stiffness, peak forces, and crack volume.
Conclusions:
- Dynamic fracture models are necessary for simulating rapid bone fracture.
- Inertia effects significantly influence fracture mechanics at high load rates.
- Fracture processes differ substantially between low and high impulse loading scenarios.
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