A workflow for evaluating J-shaped prosthetic blades using shape memory alloys: Finite element analysis and material...

Area of Science:

• Biomechanics
• Materials Science
• Rehabilitation Engineering

Background:

• Individuals with transtibial amputations require advanced prosthetic devices to improve mobility.
• Energy Storing and Returning (ESAR) prosthetics offer enhanced range of motion through innovative designs and materials.

Purpose of the Study:

• To develop and validate a workflow for assessing J-shaped ESAR prosthetic blades under dynamic gait conditions.
• To compare the performance of different materials for J-shaped below-knee prosthetic blades.

Main Methods:

• Simulated J-shaped prosthetic blade models using various materials in Abaqus CAE.
• Utilized OpenSim to simulate natural gait cycles (walking, running) for boundary conditions.
• Applied Finite Element Analysis (FEA) with the Auricchio-Taylor model for NiTinol super-elasticity.

Main Results:

• Carbon fiber composite and NiTinol composite showed the best performance.
• Carbon fiber composite was 68% lighter than NiTinol composite, indicating superior weight-to-performance ratio.
• Evaluated parameters included stress, strain, deformation, strain energy, and mass.

Conclusions:

• The proposed comprehensive evaluation workflow is suitable for prosthetic feet research.
• The methodology can be adapted for a broader range of rehabilitation devices.
• Carbon fiber composites present a promising lightweight and high-performance material for ESAR prosthetics.