Finite Element Analysis of a Transtibial prosthetic during Gait Cycle

Abstract

Prosthesis is an artificial part used by amputees as an alternative device to support activities of daily life. It is used to replace the amputated limb and mimic the human movement and locomotion. This paper aims to analyze the stress distribution of a transtibial prosthetic leg during gait cycle using CATIA V5. The dimension of the prototype was based on an average dimension of an actual human foot of Malaysian. The prototype implemented the integration of mechanical and electrical components. Furthermore, the movement of the prototype are based on deviations of angle between pylon and foot. The deviations were detected by rotary angle sensor which then triggered the DC motor to operate. Static analysis had been done using Generative Structural Analysis workbench in CATIA V5 software. Peak von Mises stress were found on the foot at toe off. The highest von Mises stress at the pylon beam was 995MPa and has stress of 156MPa on top of the pylon during heel strike. Furthermore, the foot has peak stress up to 3.18MPa. The result presented here may facilitate improvement of costeffective prosthetic leg. 

Smart Gnathometer for Bite Force Measurement

“…Von Mises stress is a stress value to determine whether the given material would yield or fracture at specific points. Von Mises stress yield criterion states that when the stress is equal to or greater than the fracture limit of the same use of material, the device will fracture (Rohjoni et al, 2020). The static analysis study was carried out using CATIA V5 to implement polylactic acid plastic material and a load of 150N, as shown in Figure 7(a).…”

Energy storage and stress–strain characteristics of a prosthetic foot: a priori design and analysis with experiments

“…Additionally, this manuscript presents an avenue for the evaluation of the stress–strain characteristics of a prosthetic foot through the stance phase of walking, in order to assist the development of structurally robust devices. Numerous efforts towards the estimation of the stress distribution of the prosthetic feet were performed with approximations to its geometry and non‐linear mechanical behavior 28,37–40 . The novelty of this work lies in the use of a comprehensive non‐linear FE approach to present an a priori technique for the determination of the magnitude and distribution of a series of stress–strain parameters namely, the von‐Mises stress, the von‐Mises strain, the longitudinal and shear stresses with respect to specified reference axes and planes, across the multiple components of the prosthetic foot.…”

“…Numerous efforts towards the estimation of the stress distribution of the prosthetic feet were performed with approximations to its geometry and non-linear mechanical behavior. 28,[37][38][39][40] The novelty of this work lies in the use of a comprehensive non-linear FE approach to present an a priori technique for the determination of the magnitude and distribution of a series of stress-strain parameters namely, the von-Mises stress, the von-Mises strain, the longitudinal and shear stresses with respect to specified reference axes and planes, across the multiple components of the prosthetic foot. The overarching objective is to propose the non-linear FE approach as a tool for an accurate evaluation of the aforementioned parameters to potentially aid in the design, analysis and prescription of ESAR prosthetic feet.…”