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1. WHEEL RIM ANALYSIS
USING NX SOFTWARE
BY
M.TIRUPATHI RAO(168W1A0391)
P.RAVI TEJA(168W1A03A4)
G.REVANTH (168W1A0377)
K.PAVAN SRINIVAS(168W1A0384)
SK.HUSSAIN(168W1A03B1)

2. Abstract:
The three dimensional model of the wheel to be designed using NX. In the present work a detailed static
analysis - displacement, maximum and minimum vonmises stresses and fatigue analysis of wheel rim under radial loads will be
done in NX. The application of finite element method for analyzing stress distribution and fatigue life of wheel rim to be
summarized.NX software is the latest software used for simulating the different forces, pressure acting on the component and
also for calculating and viewing the results. A solver mode in a NX software calculates the stresses, deflections, bending moments
and their relations without manual interventions, reduces the time compared with the method of mathematical calculations by a
human.
NX static analysis work to be carried out by considered two different materials namely aluminium, steel and
forged steel and their relative performances to be observed respectively
In this project by observing the results of both static and modal analysis to find best material of
aluminium, steel and forged steel materials.

3. INTRODUCTION:
The rim of a wheel is the outer circular design of the metal on which the inside edge of the tire is
mounted on vehicles such as automobiles. Analysis of wheel rim made with materials like alluminium alloy, steel alloy, forged
steel and magnesium alloy is done for fatigue strength.
The finite element method is a powerful tool or the numerical procedure to obtain solutions to many of
the problems encountered in engineering analysis. In this method of analysis, a complex region defining a continuum is
discretized into simple geometric shapes called finite elements.The domain over which the analysis is studied is divided into a
number of finite elements. The material properties and the governing relationship are considered over these elements and
expressed in terms of unknown values at element corner.
In the static analysis of wheel rim constraints will be applied on the circumference of the rim.

4. Motor vehicles are produced according to very strict rules to ensure the safety of the passengers. Every component is therefore
designed according to the criticality of the component. Wheels are classified as a safety critical component and international
cods and criteria are used to design a wheel.
Materials to produce these wheels have become has sophisticated as a design and materials can
range from steel to non ferrous alloys like magnesium and aluminum. Automotive wheels have evolved over the decades from
early spoke designs of wood and steel. Carry over’s from wagon and bicycle technology, to flat steel discs and finally to the
stamped metal configurations and modern cast and forged aluminum alloys rims of today’s modern vehicles. In recent years, the
procedures have been improved by a variety of experimental and analytical methods for structural analysis is (strain gauge and
finite element methods). Within the past 10years, durability analysis (fatigue life predication) and reliability method for dealing
with variations inherent in engineering structure have been applied to the automotive wheel.

5. FUNCTIONS OF A WHEEL RIM:
In its basic form a wheel rim is a transfer element between the tyre and the vehicle. The following
are the main functions of a wheel rim:
 Transfers torque (braking and acceleration).
 Support mass (support the mass of the motor vehicle).
 Adds mass (damped mass for driving comfort).
 Dissipates heat (from braking).
 Adds value.
 Absorbs impact (road hazards).
 Conserves energy (potential energy in momentum)

6. NX Design:
Model preparation Geometry construction :
Access to model feature parameters access to all NX tools Automated mesh mating conditions Model
simplification tools Bi-directional associativity Model feature suppression Units manager Automated model idealization
Knowledge Fusion support Geometric feature removal NX Open support
Material properties:
Isotropic : Temperature dependent
Orthotropic : Fatigue
Anisotropic : Material database

7. Load types :
Force Heat flux
Moment Heat generation
Pressure Radiation
Centrifugal and gravitational Bearing
Temperature
Torque
Hydrostatic
Fatique load variations
Surface to surface contact

8. Boundary conditions:
Rotations and translations Thermal constraint
Enforced displacements Convection
Simply supported
Pinned
Cylindrical
Slider
Roller
Symmetric and Anti-symmetric

9. Meshers and element types :
Tetra (free)
Automatic geometry abstraction
3D contact
Mesh mating conditions
Edit mesh
Mesh point

10. Viewing results :
Fringe plots Results at node/element
Cutting planes Error estimate plot
Contour lines Automatic report writing
Iso surfaces Multiple viewports
Animation Templates
Deformed shape Advanced lighting
Result comparison Automatic min/max tags

11. Solution Steps:
Starting the Simulation:
You can select the solver algorithm from one of these: NX Nastran, NX Thermal/Flow, NX Nastran Design, MSC
NASTRAN, Ansys, Abaqus, NX Electronic Systems Cooling, NX Space Systems Thermal, LS-DYNA, and NX Multiphysics. In addition,
you can choose the type of analysis to be performed. In this tutorial, only Structural Analysis will be covered with NX Nastran
Design.

12. Choosing the Material Properties:
This allows you to change the physical properties of the material that will be used for the model. For
example, if we use steel to manufacture the impeller, we can enter the constants such as density, Poisson’s ratio, etc. These
material properties can also be saved in the library for future use or can be retrieved from Library of Materials.
Applying the Loads:
This option allows you to exert different types of forces and pressures to act on the solid along with the
directions and magnitudes.

13. Solution and Results:
This is the command to solve all the governing equations by the algorithm that you choose and all the above
options. This solves and gives the result of the analysis of the scenario.

14. Applying the Boundary Conditions:
Boundary conditions are surfaces that are fixed to arrest the degrees of freedom. Some surfaces can be
rotationally fixed and some can be constrained from translational movement.
Meshing the Bodies:
This is used to discretize the model as discussed in beginning of the chapter. Normally, we select tetrahedral
shapes of elements for approximation. You can still select the 2- D and 1-D elements depending on the situation and
requirements by choosing these options from the drop-down menu.

15. THANK YOU