scholarly journals Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hui-Jin Um ◽  
Heon-Su Kim ◽  
Woolim Hong ◽  
Hak-Sung Kim ◽  
Pilwon Hur
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nonlinear Stiffness ◽  
Element Analysis ◽  
Shape Factors ◽  
Prosthetic Foot ◽  
Human Foot ◽  
Stiffness Characteristic ◽  
General Feeling ◽  
Foot Function

AbstractToe joint is known as one of the critical factors in designing a prosthetic foot due to its nonlinear stiffness characteristic. This stiffness characteristic provides a general feeling of springiness in the toe-off and it also affects the ankle kinetics. In this study, the toe part of the prosthetic foot was designed to improve walking performance. The toe joint was implemented as a single part suitable for 3D printing. The various shape factors such as curved shape, bending space, auxetic structure, and bending zone were applied to mimic human foot characteristics. The finite element analysis (FEA) was conducted to simulate terminal stance (from heel-off to toe-off) using the designed prosthetic foot. To find the structure with characteristics similar to the human foot, the optimization was performed based on the toe joint geometries. As a result, the optimized foot showed good agreement with human foot behavior in the toe torque-angle curve. Finally, the simulation conditions were validated by comparing with human walking data and it was confirmed that the designed prosthetic foot structure can implement the human foot function.

scholarly journals Design of 3D Printable Prosthetic Foot to Implement Nonlinear Stiffness Behavior of Human Toe Joint Based On Finite Element Analysis

2021 ◽  
Author(s):  
Hui-Jin Um ◽  
Heon-Su Kim ◽  
Woolim Hong ◽  
Hak-Sung Kim ◽  
Pilwon Hur
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nonlinear Stiffness ◽  
Element Analysis ◽  
Shape Factors ◽  
Prosthetic Foot ◽  
Human Foot ◽  
Foot Structure ◽  
General Feeling ◽  
Foot Function

Abstract The toe joint is one of the critical factors in designing a prosthetic foot. This is because its nonlinear stiffness provides a general feeling of springiness in the toe-off and it also affects the ankle kinetics. In this study, the toe part of the prosthetic foot was designed to improve walking performance. The toe joint was implemented as a single part suitable for 3D printing. The various shape factors such as curved shape, bending space, auxetic structure, and bending zone were applied to mimic human foot characteristics. The finite element analysis (FEA) was conducted to simulate terminal stance (from heel-off to toe-off) using the designed prosthetic foot. To find the structure with characteristics similar to the human foot, the optimization was performed based on the toe joint geometries. As a result, the optimized foot showed good agreement with human foot behavior in the toe torque-angle curve. Finally, the simulation conditions were validated by comparing with human walking data and it was confirmed that the designed prosthetic foot structure can implement the human foot function.

scholarly journals A Finite Element Analysis of a Human Foot Model to Simulate Neutral Standing on Ground

2016 ◽  
Vol 147 ◽  
pp. 240-245 ◽  
Author(s):  
Zahari Taha ◽  
Muhammad Syukur Norman ◽  
Syed Faris Syed Omar ◽  
Edin Suwarganda
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Human Foot ◽  
Foot Model

Finite element analysis of a human foot

2021 ◽  
Author(s):  
V. Balaji ◽  
D. Rajesh ◽  
N. Murugu Nachippan ◽  
T. Maridurai ◽  
T. Sathish ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Human Foot

Compressive Stress Relaxation and Nonlinear Finite Element Analysis of Ethylene/Acrylic Vamac® Terpolymer Elastomer (AEM)

2004 ◽  
Author(s):  
Rick D. Fong ◽  
Erol Sancaktar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Relaxation ◽  
Compressive Stress ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Time Dependency ◽  
Element Analysis ◽  
Shape Factors

The main purpose of this paper is to investigate the time dependency of rubber viscoelastic characteristics at various shape factors (SF) and compression percentages (%), namely Compressive Stress Relaxation (CSR) and Retaining Sealing Force (RSF). Results from nonlinear Finite Element Analysis (FEA) were found corresponding with the static CSR data, which could be used for estimating long term CSR effects of particular products with similar SF and compression % and operation environments.

scholarly journals Structural FEA-Based Design and Functionality Verification Methodology of Energy-Storing-and-Releasing Prosthetic Feet

2021 ◽  
Vol 12 (1) ◽  
pp. 97
Author(s):  
Johnnidel Tabucol ◽  
Tommaso Maria Brugo ◽  
Marco Povolo ◽  
Marco Leopaldi ◽  
Magnus Oddsson ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Geometry Optimization ◽  
Functional Verification ◽  
Healthy Human ◽  
Element Analysis ◽  
Human Foot ◽  
Dimensional Finite Element ◽  
Prosthetic Feet

The prosthetic feet that are most often prescribed to individuals with K3/K4 levels of ambulation are the ESR feet. ESR stands for energy-storing and -releasing. The elastic energy is stored by the elastic elements in composite materials (carbon fiber or glass fiber). ESR feet must be developed and optimized in terms of stiffness, taking into account the loads that a healthy human foot undergoes and its kinematics while walking. So far, state-of-the-art analyses show that the literature approaches for prosthetic foot design are not based on a systematic methodology. With the aim of optimizing the stiffness of ESR feet following a methodological procedure, a methodology based on finite element structural analysis, standard static testing (ISO 10328) and functional verification was optimized and it is presented in this paper. During the path of optimization of the foot prototypes, this methodology was validated experimentally. It includes the following: (i) geometry optimization through two-dimensional finite element analysis; (ii) material properties optimization through three-dimensional finite element analysis; (iii) validation test on physical prototypes; (iv) functionality verification through dynamic finite element analysis. The design and functional verification of MyFlex-γ, a three-blade ESR foot prosthesis, is presented to describe the methodology and demonstrate its usability.

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