Quasi-static and ratcheting properties of trabecular bone under uniaxial and cyclic compression
| Autor: | Li-Min Dong, Chao-lei Wei, Hong Gao, Lilan Gao, Nan Yang, Chunqiu Zhang |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Compressive Strength 0206 medical engineering Bioengineering 02 engineering and technology Models Biological Viscoelasticity Biomaterials Stress (mechanics) Elastic Modulus Stress relaxation medicine Pressure Composite material Elastic modulus Strain rate 021001 nanoscience & nanotechnology 020601 biomedical engineering Compressive strength medicine.anatomical_structure Creep Mechanics of Materials Cancellous Bone Stress Mechanical 0210 nano-technology Cancellous bone |
| Zdroj: | Materials scienceengineering. C, Materials for biological applications. 77 |
| ISSN: | 1873-0191 |
| Popis: | The quasi-static and ratcheting properties of trabecular bone were investigated by experiments and theoretical predictions. The creep tests with different stress levels were completed and it is found that both the creep strain and creep compliance increase rapidly at first and then increase slowly as the creep time goes by. With increase of compressive stress the creep strain increases and the creep compliance decreases. The uniaxial compressive tests show that the applied stress rate makes remarkable influence on the compressive behaviors of trabecular bone. The Young's modulus of trabecular bone increases with increase of stress rate. The stress-strain hysteresis loops of trabecular bone under cyclic load change from sparse to dense with increase of number of cycles, which agrees with the change trend of ratcheting strain. The ratcheting strain rate rapidly decreases at first, and then exhibits a relatively stable and small value after 50cycles. Both the ratcheting strain and ratcheting strain rate increase with increase of stress amplitude or with decrease of stress rate. The creep model and the nonlinear viscoelastic constitutive model of trabecular bone were proposed and used to predict its creep property and rate-dependent compressive property. The results show that there are good agreements between the experimental data and predictions. |
| Databáze: | OpenAIRE |
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