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FAILURE OF DRIVE SHAFT USING FINITE ELEMENT ANALYSIS
MOHD ZULHILMI BIN MD YUSOF
Report submitted in partial fulfilment of the requirements for the award of the degree of
Bachelor of Mechanical Engineering with Automotive Engineering.
Faculty of Mechanical Engineering UNIVERSITI MALAYSIA PAHANG
DECEMBER 2010
ii
SUPERVISOR’S DECLARATION
I hereby declare that I have checked this project and in my opinion, this project is
adequate in terms of scope and quality for the award of the degree of Bachelor of
Mechanical Engineering with Automotive Engineering.
Signature : ---------------------------------
Name of Supervisor : PN. NORHAIDA BINTI AB. RAZAK
Position : LECTURER OF MECHANICAL ENGINEERING
Date : 6 DECEMBER 2010
iii
STUDENT’S DECLARATION
I hereby declare that the work in this project is my own except for quotations and
summaries which have been duly acknowledged. The project has not been accepted for
any degree and is not concurrently submitted for award of other degree.
Signature : ..................................
Name : MOHD ZULHILMI BIN MD YUSOF
ID Number : MH07013
Date : 6 DECEMBER 2010
v
ACKNOWLEDGEMENTS First of all I would like to express my sincere gratitude to my supervisor Pn.
Norhaida Binti Ab. Razak for his germinal ideas, invaluable guidance, continuous encouragement and constant support in making this research possible. He has always impressed me with his outstanding professional conduct, his strong conviction for science, and his belief that a Degree program is only a start of a life-long learning experience. I appreciate his consistent support from the first day I applied to graduate program to these concluding moments. I also sincerely thanks for the time spent proofreading and correcting my many mistakes.
My sincere thanks go to all my mates and members of the staff of the Mechanical Engineering Department, UMP, who helped me in many ways and made my stay at UMP pleasant and unforgettable. Many special thanks go to instructor engineer and assistance instructor for their excellent co-operation, inspirations and supports during this study.
Finally, I acknowledge my sincere indebtedness and gratitude to my parents for their love, dream and sacrifice throughout my life. I cannot find the appropriate words that could properly describe my appreciation for their devotion, support and faith in my ability to attain my goals. Special thanks should be given to my committee members. I would like to acknowledge their comments and suggestions, which was crucial for the successful completion of this study.
vi
ABSTRACT
This project presented about a failure of drive shaft in conventional passenger vehicles. Perodua Kancil front wheel drive shaft was chosen as the specimen of this analysis. This project deals with analysis on stress using finite element method. The solid model of the drive shaft need to be constructs using SOLIDWORK software. The type of material used in the drive shaft need to be known first before stress analysis can be performed using Patran-Nastran software. The known material will provide the information such as density, modulus of elasticity and tensile strength required for the software to perform the stress and failure analysis. Spectroscopic analysis is carried out using FOUNDRY-MASTER UV instrument. The load applied at the ends of the shaft that are lateral bending load of 1/4 of weight of the full car. Boundary conditions are applied at the bearing and geared location. The highest stress at and displacement was predicted occurred at the fillet cross section location. Stresses will concentrate in the smaller diameter portion due to change in shaft diameter as they pass from large to the small diameter. In any case, one must determine the cause of failure and predict the fatigue life to prevent future occurrence and to improve the performance of the device, component or structure.
vii
ABSTRAK
Projek ini mempersembahkan tentang kegagalan aci pemacu kenderaan penumpang konvensional. Aci pemacu roda depan Perodua Kancil dipilih sebagai spesimen dalam analisis ini. Projek ini berkaitan dengan analisis terhadap stres menggunakan kaedah unsur hingga. Model aci pemacu roda perlu pembina menggunakan perisian SOLIDWORK. Jenis bahan yang digunakan dalam aci pemacu perlu diketahui terlebih dahulu sebelum analisa tegangan boleh dilakukan dengan menggunakan perisian Patran-Nastran. Kandungan bahan yang dikenali akan memberikan maklumat seperti kerapatan, modulus elastisitas dan kekuatan tarik yang diperlukan untuk perisian bagi melakukan analisis stres dengan menggunakan perisian Patran-Nastran. Analisis spektroskopi dilakukan dengan menggunakan alat FOUNDRY-MASTER UV. Beban yang diterapkan pada hujung aci adalah 1 / 4 berat kereta penuh. Keadaan batasan diletakkan pada lokasi gear dan bebola. Tegangan dan pemindahan yang tertinggi diramalkan berlaku di kawasan keratan rentas filet.Tegangan akan menumpu pada kawasan diameter yang lebih kecil kerana perubahan diameter aci pemacu dari diameter besar ke diameter kecil. Dalam kes apapun, seseorang harus menentukan penyebab kegagalan dan meramal umur kelelahan untuk mengelakkan berlakunya kegagalan pada masa depan dan untuk meningkatkan prestasi komponen, peranti atau struktur.
viii
TABLE OF CONTENTS
Page
SUPERVISOR’S DECLARATION ii
STUDENT’S DECLERATION iii
DEDICATION iv
ACKNOWLEDGEMENT v
ABSTRACT vi
ABSTRAK vii
TABLE OF CONTENTS viii
LIST OF TABLES xi
LIST OF FIGURES xii
LIST OF SYMBOLS xv
LIST OF ABBREVIATIONS xvi
CHAPTER 1 INTRODUCTION 1
1.1 Background. 1
1.2 Objective. 2
1.3 Scope of the project. 2
1.4 Problem statement. 3
CHAPTER 2 LITERATURE REVIEW 4
2.1 Introduction 4
2.2 Drivetrain Fundamentals 4
2.2.1 Rear-Wheel-Drive (RWD) 5 2.2.2 Front-Wheel-Drive (FWD) 6 2.2.3 Four-Wheel-Drive (4WD) 7 2.3 Drive Shafts 8
2.4 Universal Joint (U-Joint) 9
2.5 Constant Velocity (CV) Joint 10
2.5.1 Outer CV Joint 11 2.5.2 Inner CV Joint. 12
ix
2.6 Various Types of Drive Shafts. 12
2.6.1 Bar Shaft. 12 2.6.2 Tube Shaft. 14 2.7 Modern Drive Shaft Manufacturing Processes. 15
2.7.1 Choice of Material. 16 2.7.2 Spline Manufacturing by Rolling. 16 2.7.3 Heat Treatment. 17 2.8 Failure of Shaft. 17
2.9 Finite Element Method. 18
2.10 Mechanical Behavior of Metal 19
2.11 Fatigue. 20
CHAPTER 3 METHODOLOGY 23
3.1 Introduction 21
3.2 Model Drawing. 25
3.3 Spectroscopic Analysis 27
3.4 Stress Analysis. 30
CHAPTER 4 RESULT AND DISCUSSION. 33
4.1 Introduction 33
4.2 Finite Element Analysis 33
4.2.1 Results of Meshing. 31 4.2.2 Results of Spectroscopic Analysis. 34 4.2.3 Results of The Stress Analysis. 36 4.2.4 Results of The Displacement Analysis. 37
CHAPTER 5 CONCLUSION AND RECCOMENDATION 38
5.1 Introduction. 38
5.2 Conclusion and Recommendation 38
REFERENCES 39
APPENDICES 39
A Gantt Chart for FYP 1 39
B Gantt Chart for FYP 2 40
C Technical Drawing of Drive Shaft 41
x
D Solid Model Drawing of Drive Shaft 42
E Spectroscopic Analysis Results of Drive Shaft 43
xi
LIST OF TABLES
Table No. Title Page 4.1 Meshing Results 33 4.2 Material Composition of Drive Shaft (%) 34 4.3 Comparison of Drive Shaft Material and AISI 5000 (%) 35 4.4 Mechanical Properties of AISI 5000 series steel 35
xii
LIST OF FIGURES
Figure No. Title Page 1.1 Perodua Kancil Front Drive Shaft. 2 2.1 Four drivetrain configuration;
(A) RWD with a front-mounted longitudinal engine. (B) RWD with a longitudinally mounted engine in front of the rear axle. (C) RWD with a horizontally-opposed engine mounted behind the rear axle. (D) FWD with a front-mounted transverse engine
5
2.2 The Drivetrain of RWD 6 2.3 The Drivetrain on FWD. 7 2.4 The Drivetrain of 4WD 8 2.5 Universal Joint 9 2.6 Constant-Velocity Joint 10 2.7 Up to a 40 degree of operating angel 11 2.8 Rzeppa CV Joint. 11 2.9 Tripod CV Joint. 12 2.10 Simple, Cylindrical Bar Shaft 13 2.11 Bar Shaft With Special Boot Fixings. 13 2.12 Weight Optimized Bar Shaft. 13 2.13 NVH-tuned Bar Shaft (additional tuned mass) 14 2.14 NVH-tuned Bar Shaft (additional tuned damper) 14 2.15 Complete Drilled Drive Shaft. 14 2.16 Tube Shaft With a Single Weld Seam. 15
xiii
2.17 Tube Shaft with Two Weld Seams (cylindrical tube). 15 2.18 Tube Shaft with Two Weld Seams (stepped cylindrical tube). 15 2.19 Spline Rolling. 16 2.20 Gas Carburizing Process. 17 2.21 Failed Drive Shaft. 18 2.22 Typical engineering stress-versus-engineering strain curve 19 2.23 S-N Curve Graph. 21 3.1 Vernier caliper 23 3.2 Flow Chart/ Project Flow for Final Year Project 24 3.3 A scematic Technical Drawing and Photograph of The Analyzed
Driveshaft. 24
3.4 Drawing of Driveshaft’s Cross-sectional Area. 25 3.5 Revolve and Circular Pattern Feature Results. 26 3.6 Final Completed Model of Driveshaft. 26 3.7 FOUNDARY-MASTER UV 27 3.8 Drive Shaft Samples 27 3.9 Linear precision saw machine 28 3.10 Grinding machine 28 3.11 Metal & alloy composition search. 29 3.12 Meshing operation 30 3.13 Boundary condition and load 31 3.14 Material properties input 32 3.15 Nastran solver. 32 4.1 Meshing Results 33
xiv
4.2 Stress Analysis Results. 36 4.3 Displacement Analysis Results. 37
xv
LIST OF SYMBOLS
� Stress (MPa) � Strain (MPa)
xvi
LIST OF ABBREVIATIONS
FWD Front wheel drive RWD Rear wheel drive 4WD Four wheel drive CV Constant velocity OES Optical Emission Spectroscopy
1
CHAPTER 1
INTRODUCTION
1.1 BACKGROUND
The power produced from an engine of automobile can be transferred to the
drive wheel by power transmission system. Each automobile has different power
transmission system constructive features depend on the vehicle’s driveline
concept.(H.Bayrakceken et al., 2006) To transmit the driving torque from the engine or
gear unit to the wheels, most of passenger car and light vehicle driven by combustion
engine has at least two driveshaft as a basic requirement (Amborn, P. 1995).
During operation, torsional stress and bending stress was experienced by
driveshaft due to the weight of the car or misalignment of journal bearing (Asi, 2006).
In order to meet the requirements of one of the most highly stressed components in
automotive assembly, a failure investigation must be conducted. Finite element method
was used as stress analysis to determine the stress conditions at the failed section.
Nearly all of driveshaft are metal shafts or metal tubes that has special joint at each end
called universal joint (U-joint) or constant-velocity (CV) joint (Birch and Rockwood,
2005).
1.2 OBJECTIVE
The main objective of this project is:
i. To construct
ii. To investigate the material composition of the drive shaft.
iii. To investigate the stress analysis
using PATRAN
1.3 SCOPE OF THE PROJECT
This project will focus on
of Perodua Kancil as in Figure 1.1
a total length of 677 mm with
100 mm respectively. The model must be constructed using SOLIDWORK software
before it can be imported into
analysis need to be done to the drive shaft
know the type of material used. The
used in stress analysis were taken from the material website database.
Figure
The main objective of this project is:
To construct the geometry of the driveshaft using SOLIDWORK.
To investigate the material composition of the drive shaft.
investigate the stress analysis and predict the failure
PATRAN-NASTRAN software.
SCOPE OF THE PROJECT
This project will focus on performing failure analysis to front wheel drive
as in Figure 1.1 using PATRAN-NASTRAN software.
a total length of 677 mm with the outer diameter and the inner diameter
The model must be constructed using SOLIDWORK software
before it can be imported into PATRAN-NASTRAN to be analyzed.
analysis need to be done to the drive shaft using FOUNDRY-MASTER UV
type of material used. The physical and mechanical properties that will be
were taken from the material website database.
Figure 1.1: Perodua Kancil Front Drive Shaft
2
the geometry of the driveshaft using SOLIDWORK.
To investigate the material composition of the drive shaft.
and predict the failure of driveshaft
performing failure analysis to front wheel drive shaft
software. The shaft has
the outer diameter and the inner diameter of 117 mm and
The model must be constructed using SOLIDWORK software
to be analyzed. Spectroscopic
MASTER UV in order to
physical and mechanical properties that will be
were taken from the material website database.
3
1.4 PROBLEM STATEMENT
Drive shafts are one of the most important components in vehicles. It generally
subjected to torsional Stress and bending stress due to weights of components. Thus,
these rotating components are susceptible to fatigue by the nature of their operation.
Common sign of driveshaft failure is vibration or shudder during operation. Driveshaft
mainly involves in steering operation of vehicle. Drivers will lose control of their
vehicle if the drive shafts broke during high speed cornering. Because of this human life
can be in great danger if we don’t know when, where and how the drive shaft will
failed. It is very important to know the accurate prediction for the drive shaft to fail.
4
CHAPTER 2
LITERATURE REVIEW
2.1 INTRODUCTION
This chapter will explain more about the information collected related to this
project such as automotive drive train concept, types of driveshaft, joint used in
driveshaft, manufacturing process of driveshaft, the common type of failure to
driveshaft, finite element method and fatigue.
2.2 DRIVETRAIN FUNDAMENTALS
An automotive drivetrain is an assembly of one or more driveshaft, universal
joint, and slip joint that forms the connection between the transmission and the drive
axle. The function of drivetrain is that it allows the driver to control the power flow,
speed and multiple the engine’s torque. Besides that, the drivetrain allow the driven
wheels to make turns without causing excessive tire and gear wear. The design of the
vehicle will determine how the configuration of the drivetrain is which can be front-
wheel-drive (FWD), rear-wheel-drive (RWD), and four-wheel-drive (4WD) as shown in
Figure 2.2 (Kershaw and Halderment, 2007).
Figure 2.1: Four drivetrain configuration;
engine. (B) RWD with a longitudinally mounted engine in front of the rear axle. (C)
RWD with a horizontally
Source:
2.2.1 Rear-Wheel-Drive (RWD)
Nowadays, fewer vehicles were made as RW
disadvantages compared to others drive train.
drive train concept before FWD was introduced.
vehicle placed at the front while the drive line while the driven wheel located at the rear
as shown in Figure 2.2.
the need of a driveshaft.
driveshaft, and rear axle. The drive line connect the transmission output shaft to the rear
axle (Crouse and Anglin, 1993)
Four drivetrain configuration; (A) RWD with a front-mounted longitudinal
engine. (B) RWD with a longitudinally mounted engine in front of the rear axle. (C)
RWD with a horizontally-opposed engine mounted behind the rear axle. (D) FWD with
a front-mounted transverse engine.
Source: Kershaw and Halderment (2007)
Drive (RWD)
, fewer vehicles were made as RWD except luxury car
disadvantages compared to others drive train. This was the original layout for vehicle
drive train concept before FWD was introduced. RWD is where the engine of the
vehicle placed at the front while the drive line while the driven wheel located at the rear
Moreover, moving the engine closer to the drive axle eliminates
the need of a driveshaft. The drive train of a RWD consists of a clutch, transmission,
driveshaft, and rear axle. The drive line connect the transmission output shaft to the rear
(Crouse and Anglin, 1993).
5
mounted longitudinal
engine. (B) RWD with a longitudinally mounted engine in front of the rear axle. (C)
opposed engine mounted behind the rear axle. (D) FWD with
except luxury car due to
This was the original layout for vehicle
D is where the engine of the
vehicle placed at the front while the drive line while the driven wheel located at the rear
engine closer to the drive axle eliminates
of a clutch, transmission,
driveshaft, and rear axle. The drive line connect the transmission output shaft to the rear
6
Figure 2.2: The drivetrain of RWD.
Source: Crouse and Anglin (1993)
The advantages of RWD is that there is no body vibration because the engine
and gearbox are attach to the car frame through mount so that their vibration does not
pass to the body.This will creates better confort to the user. By focusing the front
wheels to do the steering, and the rear wheels driving the car will result in a better-
balanced vehicle on dry pavement.This eliminates torque steer and improves
acceleration. However there is disadvantages in RVD that make car manufacturer shift
from RVD to FWD. It is more expensive to produce RVD vehicle because long rear
driveshaft and rear drive axle is needed.Besides that, RVD cars are heavier and they
have a tunnel in the middle of the body, which reduce the saloon space. More
importantly, RVD tend to slip more in sharp snow or rain.
2.2.2 Front-Wheel-Drive (FWD)
The driveline concept that is more commonly used nowadays is the front-wheel
drive (FWD) as shown in Figure 2.3. It consists of a clutch, transaxle, and a pair of
drive shaft.(Birch and Rockwood, 2005).The major difference of FWD compared to
RWD is that there is no propeller shaft used in FWD. The movement of the vehicle is
generated by flowing the power from the differential section of the transaxle through
halfshafts to the wheels.
7
Figure 2.3: The drivetrain on FWD.
Source: Birch and Rockwood (2005)
The production cost far FWD vehicle is more economical due to the removal of
propeller shaft and rear drive axle installation. Moreover manufacturer can lowered and
flattened the floor in order to increase the amount of passanger compartment and trunk
space due to the absence of propeller shaft. With most of its weight at the front, FWD
holds an advantage in slippery conditions such as ice or snow as more weight is over the
drive wheels reducing slip during acceleration. Weight reduction due to less component
used will improve the fuel eficiency.However, the disadvantages of FWD are mainly
the decrease in vehicle handling ability. With more weight over the front of the
automobile, the back end tends to become very light. Rear tire traction is decreased and
the car may swap ends on icy roads easier.
2.2.3 Four-Wheel-Drive (4WD)
A four-wheel-drive (4WD) vehicle is where the vehicle can drive two wheel all
of the time all four wheel part of the time depending on the road condition as shown in
Figure 2.4. Different 4WD vehicle has different four-wheel configuration. The basic
types of configuration commonly use in industry is part-time 4WD, full-time 4WD, all-
wheel-drive (AWD) and automatic 4WD. The 4WD vehicle drivetrain consist of a
clutch, transmission, driveshaft, rear axle, transfer case, front driveshaft and front drive
axle. Some of the component is similar to RWD drivetrain.
Source:
During off-road driving and driving on wet or icy road, the 4WD drive train can
increase traction to ensure safer driving experience
2007). Moreover, the vehicle will have more pulling power when it drives its entire
wheel. The main disadvantage of 4WD
to complex transmission component and require more m
more complex procedure of maintenance and repair compared to two
design.
2.3 DRIVE SHAFTS
Power produced by the engine will be transferred
The usage of driveshaft
because it is less likely to become jammed or broken c
construction features of driveshaft
vehicle. RWD vehicle usuall
joint (U-joint) and slip joint at each end. As for FWD vehicle use driveshaft
shafts that has constant
function of the joint is to allow
Figure 2.4: The drivetrain of 4WD.
Source: F.Kershaw and D.Halderman (2007)
road driving and driving on wet or icy road, the 4WD drive train can
increase traction to ensure safer driving experience (F.Kershaw and D.Halderman,
Moreover, the vehicle will have more pulling power when it drives its entire
el. The main disadvantage of 4WD is that higher manufacturing
to complex transmission component and require more machinery. Moreover 4WD need
more complex procedure of maintenance and repair compared to two
SHAFTS
Power produced by the engine will be transferred to the wheel though driveshaft.
The usage of driveshaft as a power transmitter in automobile is more
it is less likely to become jammed or broken compared to chain
of driveshaft used is different depending on the drivetrain of the
usually use drive shaft called propeller shafts
joint) and slip joint at each end. As for FWD vehicle use driveshaft
that has constant-velocity joint at each end (Crouse and Anglin, 1993)
function of the joint is to allow changes in suspension angle.
8
road driving and driving on wet or icy road, the 4WD drive train can
(F.Kershaw and D.Halderman,
Moreover, the vehicle will have more pulling power when it drives its entire
is that higher manufacturing costs required due
achinery. Moreover 4WD need
more complex procedure of maintenance and repair compared to two-wheel-drive
to the wheel though driveshaft.
as a power transmitter in automobile is more convenience
ompared to chain-drive. The
used is different depending on the drivetrain of the
called propeller shafts that has universal
joint) and slip joint at each end. As for FWD vehicle use driveshaft called half
d Anglin, 1993). The
9
2.4 UNIVERSAL JOINT (U-JOINT)
A universal joint (U-joint) is a joint in a rigid rod that permits the rod to move
up and down while spinning in order to transmit power by changing the angle between
the transmission output shaft and the driveshaft as shown in Figure 2.5. The most
common types of U-joint used in automotive industry is Hooke or Cardan joint (Birch
and Rockwood, 2005). A basic U-joint consists of driving yoke, driven yoke, spider and
trunnions. Each connection part of the spider and trunnion are assembled in needle
bearing together with the two yokes. The driving yoke force the spider to rotate the
other two trunnions. The previous action causes the driven yoke to rotate.
Figure 2.5: Universal joint
Source: Birch and Rockwood (2005)