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Ratcheting-fatigue behavior of trabecular bone under cyclic tensile-compressive loading
Xianglong Lin1, Jie Zhao2, Lilan Gao1
1Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, 300384, PR China; National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin, 300384, PR China.
Journal of the Mechanical Behavior of Biomedical Materials
|August 22, 2020
Summary
Trabecular bone ratcheting-fatigue behavior under cyclic loading was investigated. Increased stress amplitude and holding time significantly affect ratcheting strain and accelerate bone damage.
Area of Science:
- Biomechanics
- Materials Science
- Orthopedics
Background:
- Trabecular bone exhibits ratcheting-fatigue behaviors due to residual strain accumulation.
- Understanding these behaviors is crucial for predicting bone failure under physiological loading.
Purpose of the Study:
- To investigate ratcheting-fatigue behaviors of trabecular bone under cyclic tension-compression.
- To analyze the effects of loading conditions on ratcheting strain and fatigue failure.
- To explore the influence of stress amplitude, mean stress, and holding time on bone mechanics.
Main Methods:
- Cyclic tension-compression tests were performed on trabecular bone samples.
- Digital Image Correlation (DIC) technique was employed to analyze strain evolution and crack propagation.
- Varying stress amplitudes, mean stresses, and stress peak holding times were applied.
Main Results:
- Ratcheting strain increased with stress amplitude and prolonged stress peak holding time.
- Mean stress significantly influenced ratcheting strain, with different trends observed at positive, zero, and negative mean stresses.
- Increased stress amplitude accelerated sample damage and reduced fatigue life, with rapid crack propagation noted.
Conclusions:
- Loading conditions, including stress amplitude, mean stress, and holding time, critically impact trabecular bone ratcheting-fatigue.
- DIC analysis revealed accelerated damage and crack propagation under higher stress amplitudes.
- Findings provide insights into the mechanical failure mechanisms of trabecular bone under cyclic loading.
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