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Design Optimization and Development of Tubular Isogrid Composites Tubes for Lower Limb Prosthesis

  • Diego Morais Junqueira
  • Guilherme Ferreira Gomes
  • Márcio Eduardo Silveira
  • Antonio Carlos AncelottiJr
Article

Abstract

From the beginnings of humanity, natural or unnatural misfortunes such as illnesses, wars, automobile accidents cause loss of body limbs like teeth, arms, legs, etc. The solution found for the replacement of these missing limbs is in the use of prostheses. Lower limbs tubes or pylons are prosthetics components that are claimed to support loads during walking and other daily tasks activities. Commonly, prosthetic tubes are manufactured using metal materials such as stainless steel, aluminum and titanium. The mass of these tubes is generally high compared to tubes made of carbon fiber reinforced polymer matrix (CFRP) composite. Therefore, this work has the objective of design, manufacturing and analyzing the feasibility of a new tube concept, made of composite material, which makes use of lattice structure and inner layer. Until the present moment, lower limb prosthesis tubes using lattice structure and ineer layer have never been studied and/or tested to date. It can be stated that the tube of rigid ribs with inner layer and angle of 40° is more efficient than those of 26° and 30°. The proposed design allows a structural weight reduction in high performance prostheses from 120 g to 40 g.

Keywords

Pylon Transtibial prosthesis Lattice structure Isogrid Finite element method 

Nomenclature

Φ

Angle of helical ribs with respect to the axial axis of the structure

δh

Width of helical ribs

δc

Width of circular ribs

αh

Distance between helical ribs

αc

Distance between circular ribs

ρh

Specific mass of the augers

\( \overline{h} \)

Average thickness of rigid ribs

\( \overline{\delta_h} \)

Average width of helical ribs

\( \overline{\delta_c} \)

Average width of circular ribs

\( \overline{\rho} \)

Average specific mass of rigid ribs

σh

Helical ribs rupture stress

σc

Circular ribs rupture stress

D

Diameter of the isogrid tube

Ec

Circular ribs modulus of elasticity

Eh

Modulus of elasticity of the helical ribs

h

Thickness of the isogrid

k

Buckling factor

L

Length of the isogrid tube

M

Structure mass

P

Loading factor

Notes

Acknowledgements

The authors would like to acknowledge the support from the National Council for Scientific and Technological Development (CNPq), Coordination for the Improvement of Higher Education Personnel (CAPES), Funding Authority for Studies and Projects (FINEP) for the project number 01.13.0169.00 and Altair Hyperworks®.

Compliance with Ethical Standards

Conflicts of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Diego Morais Junqueira
    • 1
  • Guilherme Ferreira Gomes
    • 1
  • Márcio Eduardo Silveira
    • 2
  • Antonio Carlos AncelottiJr
    • 1
  1. 1.Mechanical Engineering InstituteFederal University of Itajubá (UNIFEI)ItajubáBrazil
  2. 2.Department of Mechanical EngineeringFederal University of São João Del-Rey (UFSJ)São João Del ReiBrazil

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