ABSTRTRACT eye ends. To obtain the solution

ABSTRTRACT

        In this dissertation the leaf spring of
a vehicle with two master leaves and eight graduated leaves of equal width and
thickness is taken into observation for different material combinations.

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       The objective of the present work is to
do comparative analysis of leaf spring of a vehicle. Comparative analysis of
different parameters such as Total Deformation, Equivalent
Elastic Strain, Equivalent (Von-Mises) Stress, Strain Energy and Mass has been
done. These parameters are studied for different leaf spring materials such as
Structural Steel, Aluminum Alloy, and Copper Alloy, Stainless Steel, Titanium
alloy, Cast Iron and Gray
cast iron in different cases where different material leaves are arranged in
different sequences. Optimum results have been evaluated by graphical
representation and comparison of same parameter values in all cases.

        3D modelling of leaf spring is done in
Creo-2.0 and the model is imported to ANSYS 14.2 workbench for FEA and static
analysis. One global coordinate at the Centre and two local coordinates are
used at eye ends. Cord element is used for meshing of leaf spring. On
increasing the element size the Pre-processing time of analysis decreases but
on the other hand accuracy of result decreases in Post-processing. The load
acts at the Centre of leaf spring in such a manner that the equal moments take
place at both eye ends.

        To obtain the solution of various
unsolved problems and to optimize the available solutions relevant to
structural engineering, use of computer aided engineering CAE software tools
are very helpful. These software packages are useful for design and analysis of
critical strictures and provide precise results with good accuracy in less time.

 CHAPTER 1

INTRODUCTION

1.1
Overview:

In order to consume natural energy resources weight
reduction in an economic manner without compromising the strength, comfort
level and performance of the vehicle has become one of the main targets of all
automobile industries. Weight reduction also gives additional advantages in
terms of increased payload and enhanced fuel efficiency to the end customer.
Weight could be reduced by optimizing design, material and manufacturing
process of the components. Leaf spring suspension system is a main system which
not only dampens the road shocks and assure comfortable ride but also acts as a
structural member and absorb breaking torque, driving torque and lateral loads.
Leaf spring suspension system is the main component assembly where the weight
reduction is possible as it consists of ten to twenty present unsprung weights,
i.e. the weight which is not supported by leaf spring.

1.2 Objectives:

Ø  To study about leaf springs and its
parameters.

Ø  To study about different leaf spring,
materials and effect of different material combination on the performance of
leaf spring.

Ø  To prepare the model of leaf spring.

Ø  FEA analysis of leaf spring.

Ø  To select the best material for leaf
spring out of the selected materials.

1.3 Motivation:

        In
order to conserve natural energy resources weight reduction in an economical
manner without compromising the strength, comfort level and performance of the
vehicle has become one of the main targets of all automobile industries. Weight
reduction also gives additional advantages in terms of increased pay load and
enhanced fuel efficiency to the end customer. Weight could be reduced by
optimizing design, material and manufacturing process of the components. Leaf
spring suspension assembly is a system which not only damps the road shocks and
assure comfortable ride but also acts as a structural member and absorbs
breaking torque, driving torque and lateral loads. The objective of present
work is to study different research works which deals with the design and
comparative static FEA analysis of composite leaf spring with that of
conventional steel leaf spring using different design and analysis software
such as Auto CAD, Pro-E, Solid works, CATIA, ANSYS, Unigraphics and Hyper mesh
etc. and to study about different alternative materials for the replacement of
conventional leaf spring material.

1.4 Literature Review:

A literature review is a brief summary of previously
done work relevant to the present proposed work. The published work relevant to
the present work is discussed in the literature review. The following research
work has been carried out on the topic which is discussed in the dissertation.

N.P.
Doshi, et al. 1 has proposed design modification in
existing leaf spring with dynamic load effect consideration by implementing
analytical and finite element method. Stress and deflection analysis has been
carried out by using ANSYS 11.0. They have concluded that on reducing number of
leaf spring from 17 to 13 weights reduced by 6 kg and cost reduced by 20%.