DESIGN AND ANALYSIS OF ILIZAROV FIXATOR Presented by

SANDEEP KRISHNAN 3440910601 SANDEEP KUMAR 3440910602 RAKESH KUMAR 3440910577 GUIDE:- MR D.BUBESH KUMAR

VINAYAKA MISSIONS UNIVERSITYAARUPADAI VEEDU INSTITUTE OF TECHNOLOGY

DEPARTMENT OF MECHANICAL ENGINEERING

What is Ansys? A designing and simulating software. Found by Dr. John A. Swanson in 1970. (Swanson Analysis Systems). To develop and market FEM. Structural, stationary, dynamics and thermal problems .

PRODUCTS:

Bio-Medical (Bone Replacements),Automotive (Toyota Prius & RBR),Aerospace (Parker Aerospace),Energy (Columbia Power & Inder Electric),Electronics (Arizona Antena & Fujitsu),Consumer Products (Dyson Fans & Speedo).

Applications in Bio-Medical Field:

ILIZAROV FIXATOR

ABSTRACT

The aim of the study was to analyse the Ilizarov fixator using Finite Element Analysis for three different metals titanium,316L ss and aluminium.The Ilizarov external fixator is the name of a device that is used to lengthen bones. It is a very powerful tool that may also be used to stabilize fractures, regrow lost bone or correct deformities . It is composed of four parallel rings, four rods, four wires, eight elements which tie the wires to rings, and thirty two nuts that hold in position the elements among them. We modeled a ring directly by Ansys programme.Various types of analysis done were total deformation , stress,strain and structural error . From the results we came to the conclusion that Titanium Ilizarov rings showed lesser deformation as compared to other fixators .

OBJECTIVE

To design an Ilizarov fixator using static structural element .

Analyse it according to material data of titanium, 316L ss and aluminium .

to find out the material with less deformation.

Materials Used:

Titanium

316L ss

Aluminium

Polyethylene

INTRODUCTION

Ilizarov fixator is a device used for stabilisation and immobilization of long bone open fractures .

It is a temporary device.

With less damage to blood supply of bone.

Rigidity of fixation is good in situation risk of infection require less experience and surgical skill .

WORKING OF ILIZAROV FIXATOR

The Ilizarov method produces a good valuable treatment in fractures of all types . All the wires are then fixed onto frame/rings by clamping with slotted and caimulated bolt. The rings in turn are connected and fixed to one another by threaded rods,ilizarov frame affords a stable support to the affected limb. Adjustments in the rods produce compression or distraction as desired between the bone ends and simultaneously deformities are also corrected.

GEOMETRY OF ILIZAROV FIXATOR

MESHING OF ILIZAROV FIXATOR

TOTAL DEFORMATION AT 2000N

TITANIUM 316L SS ALUMINIUM

LOAD(N)

Deformation(mm)

GRAPHICAL ANALYSIS OF TOTAL DEFORMATION

1 1 1 1 1 20

0.0001

0.0002

0.0003

0.0004

0.0005

0.0006

0.0007

0.0008

0.0009

0.001

titanium

steel

aluminium

STRAIN AT 2000NTITANIUM 316L SS ALUMINIUM

200N

400N

600N

800N

1000

N12

00N

1400

N16

00N

1800

N20

00N

0

0.05

0.1

0.15

0.2

0.25

0.3

titanium

steel

alu-minium

GRAPHICAL ANALYSIS OF STRAIN

Deformation(mm)

LOAD(N)

STRESS AT 2000N

TITANIUM

316L SS ALUMINIUM

GRAPHICAL ANALYSIS OF STRESS

200N

400N

600N

800N

1000

N12

00N14

00N16

00N18

00N20

00N

0.00E+00

1.00E+09

2.00E+09

3.00E+09

4.00E+09

5.00E+09

6.00E+09

7.00E+09

8.00E+09

TITANIUM316L SSALUMINIUM

Deformation(mm)

LOAD(N)

STRUCTURAL ERROR AT 2000N

TITANIUM 316L SS ALUMINIUM

200N

400N

600N

800N

1000

N12

00N14

00N16

00N18

00N20

00N

0.00E+00

5.00E-03

1.00E-02

1.50E-02

2.00E-02

2.50E-02

3.00E-02

3.50E-02

4.00E-02

4.50E-02

Titanium

Steel

alu-minium

GRAPHICAL ANALYSIS OF STRUCTURAL ERRORDeformation(mm)

LOAD(N)

• When increase the LOAD, “deformation “ too increases i.e .LOAD is directly proportional to DEFORMATION .• From the graph it can observed that deformation is increasing with increase in load .• Comparing among the 3 materials ie titanium , steel and aluminium . Aluminium is showing more deformation , than titanium & steel respectively

GRAPHICAL RESULT

CONCLUSIONThe purpose of this project is to study the mechanical characterization of the Ilizarov fixators using ANSYS Workbench 12 for various metals that are ‘Aluminium’, ‘316L SS’,’Titanium’.Stress, strain ,structural error and total deformation were analysed. From the above analysis it was found that the Titanium ilizarov rings showed lesser deformation . It is light in weight .It has a good biocompatibility .It is concluded that Titanium rings fitted in the Ilizarov fixator rings are better than the other rings.