Abstract

Loss of mobility and functional capacity is a common consequence of partial foot amputation (PFA). Several effective partial foot prostheses (PFP) have been developed to restore movements. The mechanical behaviours, safety features, von Mises stress, and total deformation of a prosthesis designed for Chopart amputation were examined in this research. The fatigue properties of various composite laminate materials were included in the analysis. Three different types of composite materials were analyzed for their fatigue and tensile properties in the fabrication of PFP. The process utilized a vacuum system and an 80:20 composite material matrix for lamination. The composite types included three different combinations: (1) 6 perlon layers; (2) (3perlon – 4glass fiber- 3perlon); (3) (3perlon - 4carbon fiber- 3perlon) layers. Mechanical testing was conducted for each group to determine their ultimate strength (ϬULT), yield stress (ϬY), and modulus of elasticity (E), providing valuable performance characteristics. The mechanical properties of the composite materials varied across the three groups. The second group demonstrated improved properties, compared to the first group, with E of 1.4 GPa, ϬY of 75 MPa, and ϬULT of 143 MPa. The third group showed the highest performance, with E of 1.9 GPa, ϬY of 105 MPa, and ϬULT of 197 MPa. In addition, critical data were obtained from pressure measurements conducted on the patient's stump and socket using the Matrix scan F-sensor. The maximum pressure values recorded were 235 and 273 kPa in the lateral and posterior regions, respectively. Fatigue testing of each group, performed using ANSYS 17.2 software, revealed that the composite material for the third group exhibited a safety factor of 2.43. This safety factor confirms that the material meets acceptable standards, making it suitable for use in the prosthetic design. This research indicates that the material meets acceptable safety requirements, making it suitable for design applications.

Keyword

Partial foot prosthesis, Composite materials, Mechanical properties, Fatigue testing, Chopart amputation, Safety factor.

Cite this article

Hamood SA, Abbas SM, Ghazwan A.Experimental testing and numerical modeling of fatigue and mechanical properties of composite materials for partial foot prostheses. International Journal of Advanced Technology and Engineering Exploration. 2024;11(121):1784-1799. DOI:10.19101/IJATEE.2024.111100967

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