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M 2023 Strength Assessment of PET Composite Prosthetic Sockets.pdf (5.76 MB)

Strength assessment of PET composite prosthetic sockets

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posted on 2023-09-15, 12:40 authored by Yogeshvaran R Nagarajan, Farukh Farukh, Vadim SilberschmidtVadim Silberschmidt, Karthikeyan Kandan, Radheshyam Rathore, Amit Kumar Singh, Pooja Mukul
A prosthesis is loaded by forces and torques exerted by its wearer, the amputee, and should withstand instances of peak loads without failure. Traditionally, strong prosthetic sockets were made using a composite with a variety of reinforcing fibres, such as glass, carbon, and Kevlar. Amputees in less-resourced nations can lack access to composite prosthetic sockets due to their unavailability or prohibitive cost. Therefore, this study investigates the feasibility of polyethylene terephthalate (PET) fibre-reinforced composites as a low-cost sustainable composite for producing functional lower-limb prosthetic sockets. Two types of these composites were manufactured using woven and knitted fabric with a vacuum-assisted resin transfer moulding (VARTM) process. For direct comparison purposes, traditional prosthetic-socket materials were also manufactured from laminated composite (glass-fibre-reinforced (GFRP)), monolithic thermoplastic (polypropylene (PP) and high-density polyethylene (HDPE)) were also manufactured. Dog-bone-shaped specimens were cut from flat laminates and monolithic thermoplastic to evaluate their mechanical properties following ASTM standards. The mechanical properties of PET-woven and PET-knitted composites were found to have demonstrated to be considerably superior to those of traditional socket materials, such as PP and HDPE. All the materials were also tested in the socket form using a bespoke test rig reproducing forefoot loading according to the ISO standard 10328. The static structural test of sockets revealed that all met the target load-bearing capacity of 125 kg. Like GFRP, the PETW and PETK sockets demonstrated higher deformation and stiffness resistance than their monolithic counterparts made from PP and HDPE. As a result, it was concluded that the PET-based composite could replace monolithic socket materials in producing durable and affordable prostheses.

Funding

ARM (Accessible Recycled Material) Prosthetics: developing capability, partnerships and research in India

Academy of Medical Sciences

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UK’s Royal Academy of Engineering project ‘Upcycled Plastic Prosthetics’ [grant reference: FF\1920\1\30]

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Materials

Volume

16

Issue

13

Publisher

MDPI

Version

  • VoR (Version of Record)

Rights holder

© the authors

Publisher statement

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

Acceptance date

2023-06-21

Publication date

2023-06-26

Copyright date

2023

eISSN

1996-1944

Language

  • en

Depositor

Prof Vadim Silberschmidt. Deposit date: 14 September 2023

Article number

4606

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