Abstract
The sockets are generally made from carbon fiber which makes them cost high. Replacing carbon fiber with a more ecological and socio-economical fiber such as Alfa fiber can considerably reduce the cost. The objective of this paper is to develop and validate a numerical finite elements virtual prototype that can be used for prosthesis design. An experimental bench is developed to measure the pressure between a residual limb and a trans-tibial prosthetic socket. Three finite element models are created and compared to experimental results. The numerical results from the virtual prototypes show a good correlation with the experimental results in fact the predictability is equal to 96.62%. Based on these results, the virtual prototype can be adopted to design resistant and comfortable trans-tibial prosthetic sockets. In the final part of the paper, a fatigue analysis is made. The fracture is observed on the first cycle and it is a ductile failure. The socket reinforced by ALFA fibers does not meet the static and fatigue requirements of ISO 10328 for the test failure, in fact required resisting force Fsu is equal to 3019N in the case of a ductile failure but the measured failure force is ~2700N. The failure occurred on the junction; no cracks appeared in the body of the socket. The junction can be studied and reinforced with a better strategy.
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Acknowledgments
The authors would like to thank all the staff of the Research Laboratory of Biomechanics and Orthopedic Biomaterials of the National Orthopedics Institute M.T. KASSAB, Tunis, Tunisia, for their cooperation.
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Helaili, S., Mankai, W., Chafra, M. (2021). Pressure Calculation and Fatigue of a Trans-tibial Prosthetic Socket Made from Natural Fiber Composite. In: Feki, N., Abbes, M.S., Taktak, M., Amine Ben Souf, M., Chaari, F., Haddar, M. (eds) Advances in Acoustics and Vibration III. ICAV 2021. Applied Condition Monitoring, vol 17. Springer, Cham. https://doi.org/10.1007/978-3-030-76517-0_22
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DOI: https://doi.org/10.1007/978-3-030-76517-0_22
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