DEVELOPMENTS, MECHANICAL PROPERTY MEASUREMENTS AND STRENGTH EVALUATIONS OF THE WRIST BRACES FOR THE WRIST FRACTURE PATIENTS

Chung-De Chen, Ching Hsiang Chen, Cheng-Li Lin, Chien-Kung Lin, Chi Tsang Wang, Ruey Mo Lin, Jing-Jing Fang

Research output: Contribution to journalArticle

Abstract

In this paper, the wrist braces for the wrist fracture patients are developed. Geometry of the patient's wrist surface anatomy was digitalized and recorded by an optical 3D scanner. An expert software was developed to generate the brace model, on which several holes are distributed to increase the air permeability. Finally, the brace is fabricated by commercial FDM 3D printer. For ensuring the strength of the wrist brace, the tensile test and impact test were conducted to measure the elastic modulus, yielding strength and fracture strength. A finite element model was established to investigate the stresses and deformations when the wrist brace is subjected to a static load. The mechanical properties measured in the tensile tests are as input parameters in the model. The static analysis showed that, for four considered movements of the wrist, the maximum von-Mises stress is less than the yielding strength. An impact analysis was also conducted to simulate brace impacted by a moving rigid ball with a mass of 0.3768kg. The results showed that the deformation at the impact point remains in the elastic range when the impact speed is 3m/s. The finite element calculations give us rules to design the number of holes and the thickness of the brace.

Original languageEnglish
Article number1940021
JournalJournal of Mechanics in Medicine and Biology
Volume19
Issue number2
DOIs
Publication statusPublished - 2019 Mar 1

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Mechanical properties
3D printers
Frequency division multiplexing
Air permeability
Static analysis
Fracture toughness
Loads (forces)
Elastic moduli
Geometry

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering

Cite this

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title = "DEVELOPMENTS, MECHANICAL PROPERTY MEASUREMENTS AND STRENGTH EVALUATIONS OF THE WRIST BRACES FOR THE WRIST FRACTURE PATIENTS",
abstract = "In this paper, the wrist braces for the wrist fracture patients are developed. Geometry of the patient's wrist surface anatomy was digitalized and recorded by an optical 3D scanner. An expert software was developed to generate the brace model, on which several holes are distributed to increase the air permeability. Finally, the brace is fabricated by commercial FDM 3D printer. For ensuring the strength of the wrist brace, the tensile test and impact test were conducted to measure the elastic modulus, yielding strength and fracture strength. A finite element model was established to investigate the stresses and deformations when the wrist brace is subjected to a static load. The mechanical properties measured in the tensile tests are as input parameters in the model. The static analysis showed that, for four considered movements of the wrist, the maximum von-Mises stress is less than the yielding strength. An impact analysis was also conducted to simulate brace impacted by a moving rigid ball with a mass of 0.3768kg. The results showed that the deformation at the impact point remains in the elastic range when the impact speed is 3m/s. The finite element calculations give us rules to design the number of holes and the thickness of the brace.",
author = "Chung-De Chen and Chen, {Ching Hsiang} and Cheng-Li Lin and Chien-Kung Lin and Wang, {Chi Tsang} and Lin, {Ruey Mo} and Jing-Jing Fang",
year = "2019",
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AU - Fang, Jing-Jing

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