Wheel plays a vital role of vehicle suspension which guides the static and dynamic load during vehicle action. Four wheeler should withstand the load while carries the heavy load of occupants considering self weight also. So that the automotive industries mostly exploring the polymeric material in order to get lesser weight without substantial loss in vehicle quality and reliability. Even though the conventional materials are used for preparing the rim has good mechanical properties but it suffers from serious disadvantage of the less weight to strength ratio and low life. This reduction of weight of a vehicle directly impacts its fuel consumption. To achieve this weight reduction the material used for manufacturing the wheel rim should be the composite materials with the identical or superior mechanical properties than the conventional rims. The materials used are Polyether ether ketone (PEEK) materials which are expressed as polyether ether ketone. In this project, analysis of the Car wheel rim is carried out for weight reduction. The wheel rim is modeled by using standard parameters in Creo Parametric 2.0 software and analyzed to see the variations of deformation and stresses of the rim for different material such as Aluminium Alloy, PEEK, PEEK with 30% Glass fiber, PEEK–90 HMF 20, PEEK–90 HMF 40 after the static structural analysis is done using the ANSYS 17.0 software. The analysis is carried using ANSYS for different compositions of the PEEK materials. The results such as deformation, vonmisesstress, life and maximum shear stress of the different PEEK materials are obtained for different four wheeler rim materials. The results of materials are compared with one another and the one with best mechanical properties is considered as the alternate material for the conventional rim wheel. Using this method, the life cycle of the rim was enhanced to 1*10e6 meet their design requirement. On analysis by implementing different PEEK composites we find that PEEK–90 HMF 20 suits the best for manufactured the wheel rim material.
Keywords: peek composites, wheel rim, modelling
The wheel is a part that permits efficient movement of an object across a surface where there is a force pressing the object to the surface. The spoke wheel rim assembly contributes the major weight addition in motorcycle after engine. To overcome this disadvantage alloy wheels are invented. While comparing all alloy materials aluminium alloy is the best of other alloy materials.^{1} The automotive industry faces increasing pressure to maximize performance while minimizing weight and cost to produce more fuel efficient vehicles. Composite materials: A new kind of material which is formed due to combination of two or more metals or nonmetals is known as composite materials. Generally composite materials are lighter and stronger than conventional metals. Thermoplastic composite materials consist of thermoplastic resins as matrix, reinforcement with traditional fibers as thermo sets matrix. They have shown great promise as materials for current and future automotive, aerospace and industrial applications. Composite material wheel is different from the light alloy wheel,^{2,3} and it is developed mainly for low weight. However, this wheel has inadequate consistency against heat and for best strength. PEEK (polyether ether ketone) polymer continues to successfully replace steel, aluminium, bronze, titanium, and other high–performance materials, because it offers an ideal combination of mechanical, thermal and aluminium spokes logical properties, combined with excellent resistance to grease, oils, acids and all other automotive fluids. PEEK is an ideal replacement for Aluminium alloy. PEEK is particularly useful in the automobile industry for its weight. Their Types are 1. PEEK 2. PEEK with 30% Glass fiber, 2. PEEK–90 HMF 20% Carbon fiber and 3. PEEK–90 HMF 40% Carbon fiber.
Problem identification:
While considering conventional wheel rim the following problems were identified
Objectives
Peek
Sl No |
Mechanical property |
Aluminum Alloy |
PEEK |
PEEK GF 30 |
PEEK 90 HMF 20 |
PEEK 90 HMF 40 |
1 |
Density (kg/m^{3}) |
2685 |
1520 |
1320 |
1370 |
1450 |
2 |
Young's Modulus (MPa) |
69000 |
4060 |
4100 |
22000 |
4500 |
3 |
Poisson's Ratio |
0.33 |
0.45 |
0.46 |
0.4556 |
0.48 |
4 |
Tensile Yield Strength (MPa) |
229 |
190 |
100 |
280 |
330 |
5 |
Compressive Yield Strength (MPa) |
250 |
118 |
95 |
270 |
310 |
6 |
Tensile Ultimate Strength (MPa) |
279 |
100 |
100 |
100 |
100 |
Table 1 Material Properties
Sl No |
Specification |
Value |
1 |
Rim Width |
215.9mm |
2 |
Wheel Diameter |
480 mm |
3 |
Offset |
128 mm |
4 |
Pitch Circle Diameter(PCD) |
110 mm |
5 |
Centre Base Diameter (CBD) |
70 |
6 |
Rim thickness |
7 |
7 |
Bolt diameter |
10 |
8 |
Number of bolt holes |
5 |
Table 2 Design of wheel rim
Modelling
There are many software packages are available for creating the 3D model of the car wheel rim and some of the software’s are
Purpose
Here we have chosen the Creo parametric as the modelling software because of following advantages.
Fem analysis of wheel rim
Procedure for analysis
Meshing the Model:
Boundary Conditions
From the following Table 3, we can calculate the Angular velocity of the wheel rim.^{4–8}
$V=\text{}r\times \omega $
Where, V= 75 km/hr = 20.83m/s
r = 240mm = 0.24m
$20.83=\text{}0.24\times \omega $
$\omega $ = 86.79 rad/s
Sl No |
Parameters |
Symbols |
Data |
1 |
Velocity of car |
V |
70km/hr |
2 |
Radius of Rim |
R |
240mm |
3 |
Tire pressure |
pi |
303.4 KPa |
Table 3 Parameters used for static steady
To get deformation and stress, a load is applied on the circumference of wheel rim and fixed on the bolt holes of the wheel rim which is shown in Figure 2.
Displacements
Translation in x, y, z directions were fixed.
Rotation in x, y, z direction was fixed.
Angular velocity in X direction is zero, Y direction is zero, and Z direction is 86.69rad /s
Results of static structural analysis on aluminium alloy material
Here due to the displacement of the centre of the wheel rim is fixed, the amount of the deformation of the material in the centre is minimum and at the circumference of the wheel rim it is maximum with the value of 0.05 mm when load is increased which is shown in Figure 3.
Due to the inflation pressure which is acting at the circumference of the rim wheel the stress induced there is maximum with the value of 14.41 MPa.^{9–12} The stress is very low at the centre of the rim due to the constrains used which is shown in Figure 4.
The shear stress is maximum at the circumferential side of the rim which is nearer to the spokes connecting side and shear stress is minimum at the wheel centre which is shown in Figure 5.
Due to the various type of fatigue that occurs in the wheel rim the life of the wheel rim stays constant for all nodes and points the rim for the cycles of 1e6 which is shown in Figure 6.
Results of PEEK material
Pure composite PEEK material withstands the amount of the deformation of the material upto 0.93365 mm which is caused by the angular velocity and the inflation. The value obtained here is some lower than the aluminium alloy because of absence of the fine bonds which is shown in Figure 7.
Due to the inflation pressure which is acting at the circumference of the rim wheel the stress induced there is maximum with the value of 14.35MPa and the minimum value of 0.008600 MPa.^{13–15} The stress is very low at the centre of the rim due to the constrains used which is shown in Figure 8.
Due to the various type of fatigue that occurs in the wheel rim, the life of the wheel rim stays constant for all nodes and points the rim for the cycles of 1e6 which is shown in Figure 9.
In the pure PEEK material, the maximum shear stress occurs at the inner circumference of the rim wheel in the back side with a value of 8.13MPa. The centre of the rim wheel and spokes experience a low shear stress with a value 0.016771MPa which is shown in Figure 10.
Results of PEEK GF 30 material
Due to the displacement of the centre of the wheel rim is fixed, the amount of the deformation of the material in the centre is minimum and at the outer circumference of the wheel rim it is maximum with the value of 0.93 mm which is shown in Figure 11.
PEEK GF30 which is composite material contains 30% of the glass fiber has a maximum von mises stress at the outer circumference of the wheel with a value of 14.38MPa which is shown in Figure 12.
For the 1e6 cycles the wheels withstand the entire tear and the tear that is produced by the mechanical forces. The composite PEEK materials have the properties identical to the conventional types which are shown in Figure 13.
In the PEEK GF 30 the maximum shear stress occurs at the inner circumference of the rim wheel in the back side with a value of 8.14 MPa. The centre of the rim wheel and spokes experience a low shear stress with a value 0.0158 MPa which is shown in Figure 14.
Results of PEEK 90 HMF 20 material
In this material, the maximum amount of the material deformed will at the outer circumference of the wheel rim with the value of the 0.1732mm. The deformation of this wheel rim is almost identical to the aluminium alloy which is shown in Figure 15.
The stress which is acting in combined three directions in this material acts maximum at the outer circumference of the wheel rim with the value of 14.386MPa which is shown in Figure 16.
In all the nodes and points of the rim the life is constant with the life cycles of 1e6 and no wear and tear make the rim failure upto this time which is shown in Figure 17.
Since PEEK 90HMF 20 has the identical property of aluminium alloy it has tendency to bear the maximum shear stress of value 8.1471MPa which is shown in Figure 18.
Results of PEEK 90 HMF 40
This high modulus carbon fiber reinforced PEEK material has the maximum deformation at the outer circumference of the rim wheel with a value of 0.85 mm when the angular velocity is in z–direction which is shown in Figure 19.
When the angular velocity of the rim with respect to x and y direction is zero, the equivalent stress acts maximum at the back side of outer circumference of the rim wheel with a value of 14.28MPa which is shown in Figure 20.
For the 1e6 cycles the wheel withstands all the wear and the tear that is produced by the mechanical forces upto 1e6 cycles. This composite PEEK material has the properties identical to the conventional types which are shown in Figure 21.
The mechanical forces cause the rim wheel to produce the shearing forces which in turn produces the maximum shear stress in the inner circumference of the wheel with the value of 8.053MPa and minimum at the centre of the wheel rim which is shown in Figure 22.
Analysis results
On interpreting the following results we find that PEEK GF 30 is the weightless material (Table 4) among the filtered PEEK material .In case of deformation, all those materials get deform about the point of loading when the load increased the rim would deform more but among those materials the PEEK 90 HMF 20 stands the best than other peek materials, where the deformation is low comparatively .On considering von mises stress all materials show similar properties nearer to the same obtained values. And also while interpreting the life cycle, all materials withstand the given life of 10e6 cycles so that we have to select the material based on the weight property consideration.^{16,17}
Sl No |
Material |
Weight, W (kg) |
Deformation, x (mm) |
Von mises Stress, σ (MPa) |
Life (cycle) |
1 |
Aluminium Alloy |
15.761 |
0.052 |
14.41 |
1.00E+07 |
2 |
PEEK |
8.922 |
0.934 |
14.43 |
1.00E+07 |
3 |
PEEK GF 30 |
7.748 |
0.932 |
14.38 |
1.00E+07 |
4 |
PEEK 90 HMF 20 |
8.041 |
0.173 |
14.38 |
1.00E+07 |
5 |
PEEK 90 HMF 40 |
8.511 |
0.851 |
14.28 |
1.00E+07 |
Table 4 Results of materials
Finite Element analysis of the four wheeler rim using Aluminium alloy and PEEK Composites has been done using ANSYS Workbench. The life cycle prediction helps to identify the durability of the material. The rim was modeled as per standards and analyzed for different materials such as Aluminium Alloy, PEEK (Polyether ether ketone), PEEK with 30% Glass fiber, PEEK–90 HMF 20, PEEK–90 HMF 40. From obtained results optimization was carried out.
The weight of rim is reduced from 15.761Kg to 7.748Kg while using PEEK GF 30 material when compare to Aluminium Alloy material. However, the deformation and stress of PEEK 90 HMF 20 material is nearly to Aluminium alloy material. The weight of PEEK 90 HMF 20 material is 8.041kg. Finally from the results it is clear that PEEK 90HMF20 is best material to replace Aluminium Alloy (A356.2) material owing to reliability and safety aspects.
None.
Author declare there is no conflict of interest.
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