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NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
FEA OF A CRANKSHAFT IN CRANK-PIN WEB FILLET REGION
FOR IMPROVING FATIGUE LIFE
Mr. Mathapati N. C.
Department Mechanical engineering,
Jaihind College of Enginnering, Kuran,Savitribai Phule
Pune University,[MS] India
Dr. Dhamejani C. L. 
Department Mechanical engineering,
Jaihind College of Enginnering, Kuran,Savitribai Phule
Pune University,[MS] India
ABSTRACT
 
A crankshaft is often designed with a fillet radius to improving fatigue life of crankshaft. The fatigue life
of crankshaft is depend on the proper fillet radius. This fillet radius is changes than fatigue life is also
changes of crankshaft. In most of the time fatigue failure is occur in crank-pin web fillet region. The
crankshaft fillet rolling process is one of the commonly adopted methods in engineering to improve fatigue
life of the crankshaft. A finite element analysis is implemented to approximate the stress distribution
induced in the crankpin fillet region. The modelling of crankshaft is created by Creo-parametric. Finite
element analysis is performed to obtain the variation of stress at critical locations and fatigue life of the
crank shaft using the ANSYS software and applying the boundary conditions. Radius of fillet is changes in
model of crankshaft to improvement in fatigue life. This work in doing for optimization of a crankshaft in
crank-pin web fillet region with fatigue life as well as to study a relation between fillet radius/diameter of
crankpin to fatigue life. .
KEYWORDS— Crankshaft failure, fatigue, Fatigue life estimation, Finite element analysis.
INTRODUCTION
Crankshaft is a large component with a complex geometry in the engine which converts the reciprocating
displacement of the piston to a rotary motion. The function of the crankshaft is to convert the convert
mechanical energy of the piston being driven back and forth by the pneumatic energy provided by pressure
change as a result of the combustion reaction. Crankshafts are high volume production internal combustion
engine components and their most commonly used is in an automobile engine. In an engine, the
reciprocating motion of the piston is linear and is converted into rotary motion using through the
crankshaft. There are many applications of a crankshaft which range from small one cylinder engines to
very large multi-cylinder marine crankshafts [1].
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
2 | P a g e
Crankshafts in automotive engines can experience a significant number of service cyclic loads. Since
fatigue cracks initiated near the fillet lead to one of the primary failure mechanisms of automotive
crankshafts, fillet rolling processes have been used to improve the fatigue lives of crankshafts for many
years. The fillet rolling process induces compressive residual stresses near the fillet surface. The
compressive residual stresses lower the fatigue driving stresses near the fillet surface due to operating
loads and consequently increase the fatigue lives of crankshafts.
As a crankshaft is subject to operating loads, the induced stresses at these high stress concentration areas
could initiate fatigue cracks and lead to failure. A fillet rolling operation is one of the commonly used
techniques to improve fatigue strength of a crankshaft because this rolling process introduces compressive
residual stresses on the contact surface and sub-surface, which will prohibit fatigue cracks to initiate and
continuously propagate. The invention regards to minimize stress in fillet region and increases fatigue life
of crankshaft using rolling in fillet region of different radius and deep of rolling. The aim of invention is
achieve static analysis through ANSYS stress value of crankshaft value to improve fatigue life of crank
shaft [2].
LITERATURE REVIEW
A more amount of work has been done on crankshaft optimization and analysis in fillet of crankshaft using
experimental as wee as numerical simulation methods and finite element analysis (FEA). But fewer
researches have carried on the radius of fillet with FEA. The basic literature available is provided the
Mahesh L. Raotole, D. B. Sadaphale, and J. R.Chaudhari presented the Prediction of Fatigue Life of Crank
Shaft using S-N Approach [4]. Sanjay B, V M Nandedkar and Surender Kumar Kaundal explains finite
element analysis approach for stress analysis of crankshaft under dynamic loading [5]. Paul Spiteria Simon
Ho, Yung-Li Lee are explained assessment of bending fatigue limit for crankshaft sections with inclusion
of residual stresses [6]. Rajesh M.Metkar, Vivek K.Sunnapwar published Evaluation of FEM based
fracture mechanics technique to estimate life of an automotive forged steel crankshaft of a single cylinder
diesel engine[7].
PROBLEM DEFINITION
Crankshaft is one of the critically loaded components in engine. Fatigue is a source of crankshaft failure.
Although, traditionally, crankshaft damages are attributed to wear and lubrication sources, fatigue is
responsible for a significant number of crankshaft failure.[8] Fatigue exists when cyclic
stresses/deformations occur in an area on a component. The cyclic stresses/ deformations have mainly
many origins, in that majorly fluctuating loads, torsion and bending on crank shaft. If number of cylinder
are increases this parameter are more affected for the crankshaft fatigue failure. In Fig.1 fatigue failure
occur in fillet region of crankshaft.
Fig. 1 Final failure on fillet of crankshaft
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
3 | P a g e  
 
DESIGN CALCULATION
For the project work using paggio vehicle of engine model G 400 WG III. The technical specification of
engine is in Table I.
TABLE I
The Technical Specification of Engine
Capacity 395 cc
Number of Cylinders 1
Bore × Stroke 86 x 68 mm
Compression Ratio 09:01
Maximum Power 8.1hp @ 3600 rpm
Maximum Torque 16.7 Nm @ 2200
rpm
Maximum gas pressure 25 bar
Fillet Radius 3.5
Force on the Piston Fp = Area of the bore x Max.
Combustion pressure = π x D2
xPmax = 14.52 KN
In order to find the thrust in the connecting rod (FQ),
We should first find out the angle of inclination of the
Connecting rod with the line of stroke (i.e. angle Ø).
We know that
Sin Ø =(Sin Ɵ/(L/R)) = sin 350
/4
Which implies Ø = 8.24°
We know that thrust in the connecting rod
FQ = FP/COSƟ
From this we have,
Thrust on the connecting rod FQ= 14.67 KN
Thrust on the crank shaft can be split into Tangential
Component and the radial component.
1) Tangential force on the crank shaft, FT= FQ sin
(θ+ Ø) =10.05 KN
2) Radial force on the crank shaft, FR= FQcos (θ+ Ø) = 10.68 KN
Reactions at bearings (1 & 2) due to tangential force
is given by,
HT1=HT2 = (FT ×b1)/b = 5.02KN (Since b1=b2=b/2)
Similarly, Reactions at bearings (1 & 2) due to radial
force is given by,
HR1=HR2 = (FR ×b1)/b = 5.34KN (Since b1=b2=b/2)
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
4 | P a g e
FEA APPROCH
Finite element analysis of crankshaft is done by geometry generation using creo-Parametri software and
analysis is using through the ANSYS 14.5 WORKBENCH software. Using proper type of loading and
boundary condition are very important in finite element analysis.
A. Generation of Geometry of Crankshaft using Creo-Parametric
From the measuring all parameter of actual crankshaft of Paggio vehicle of engine model G 400 WG III to
the drawing, the dimensions of crankshaft, solid model is generated using Creo-Parametric software. Fig.2
shows the solid model of the forged steel crankshaft from actual dimension. After completion of solid
model save as this part as IGES for Exporting into ANSYS WORKBENCH Environment.
Fig.2 Generated Geometry of Crankshaft
B. Engineering Data
In the engineering data add the basic property of crankshaft.
Material Details
Material Type: - Forged Steel
Designation: - 42CrMo4
Yield strength (MPa):- 680
Ultimate tensile strength (MPa):- 850
Elongation (%):-13
Poisson ratio:-0.3
C. Mesh Generation
Import IGES format model in ANSYS WORKBENCH simulation module. Quadratic tetrahedral elements
are used to mesh the crankshaft finite element geometry.
Fig.3 Meshed Model of Crankshaft
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
5 | P a g e
Tetrahedral elements are used for meshing the imported complex geometries to the ANSYS
WORKBENCH software. In Fig.3 shows the meshed model of crankshaft of 17789 numbers of nodes and
9615 number of elements.
D. Boundary conditions
Boundary conditions are playing the important role in finite element analysis. The bearing support is fixed
and applies tangential and radial force on crankshaft. Fig.4 shows the apply remote displacement for
bearing support fixed and apply forces on crankpin.
Fig.4 Boundary conditions for crankshaft
E. Von Misses Stress
After compilation boundary condition find out the critical point (maximum stress) on crankshaft to know
the where crack is occurring. Fig.5 shows the von misses stress on the crankshaft. From figure maximum
stress in on the fillet of crankshaft.
Fig.5 Von Misses Stress
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
6 | P a g e
F. Fatigue life
Using fatigue tool obtain fatigue life of crankshaft and obtain same for the various radius of fillet in
crankpin region. Fig.6 shows the fatigue life of crankshaft. From the figure the minimum fatigue life is
obtained on the maximum Von misses stress occur means the fatigue crack starts from that region. To
comparing fatigue life of different fillet radius in crankpin following the same method to obtain fatigue
life. In the geometry only changes the fillet radius and other boundary conditions are same.
Fig.6 Fatigue life of crankshaft
RESULTS
The results are obtained using the FEA using ANSYS software for 3.5 fillet radius 3.7404×105
fatigue life
of existing forged crankshaft. The crack start from the where the maximum von misses stress is formed.
Therefore, fatigue life of forged steel crankshaft obtained for different fillet radius r to crank pin
diameter d ratio and it is shown below. It is seen from the table, fatigue life of crankshaft increases
with the increase in r/d ratio. Similarly, the calculation for r/d = 0.03, 0.06, 0.08 and 0.1 and software
calculation results as given in the following Table3.
TABLE III
Number Of Cycles To Failure For Different r/d Ratio
Sr.
No.
Fillet
Radius
r/d Ratio Number of Cycles
to Failure
1 1.5 0.03 2.4951×100000
2 2.5 0.06 3.1685×100000
3 3.5 0.08 3.7404×100000
4 4 0.1 5.7842×100000
5 4.5 0.1125 8.1389×100000
To obtain above results only changes in the radius of fillet of crankpin all other parameters and boundary
conditions are same. Results are obtained from the ANSYS WORKBENCH 14.5 using fatigue tool.
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
7 | P a g e  
 
CONCLUSIONS
In this paper finite element analysis use to calculating number of cycles to failure of crankshaft. The
maximum stress and deformation appears at the centre of crankpin fillet between the crankshaft journal
and crank cheeks, and near the central point journal. The edge of main journal is maximum stress area in
the crankshaft.
FEA analysis using ANSYS WORKBENCH FROM fatigue tool is very efficient and simple method for
achieving fatigue at different loading condition according to force applied to the crankshaft. The use of
numerical method such as Finite Element Method now a day’s commonly used to gives detail information
about various structure or components.
The r/d ratio is increases than Von misses stress are decreases as well as number of cycles to failure in
increases.
REFERENCES
[1] George E. Diete, Mechanical Metallurgy, 3rd
Edition ,McGraw Hill Education, 2013, Pp. 375 –
431
[2] Warren C. Young Richard G. Budynas, Roark’s Formulas For Stress And Strain, Seventh Edition
New York Chicago San Francisco Lisbon London , Pp. 771 - 799 , 2002.
[3] Walter D. Pilkey Deborah F. Pilkey, Peterson’s Stress Concentration Factors, Third Edition, John
Wiley & Sons, Inc., ,Pp. 422 – 427,2007.
[4] Mahesh L. Raotole, Prof. D. B. Sadaphale, Prof. J. R.Chaudhari, “Prediction of Fatigue Life of
Crank Shaft using S-N Approach”,International Journal of Emerging Technology and Advanced
Engineering, vol.3, Pp. 427-454,2013.
[5] Sanjay B, V M Nandedkar and Surender Kumar Kaundal explains “finite element analysis
approach for stress analysis of crankshaft under dynamic loading”, INTERNATIONAL Journal of
Scientific & Engineering Reserch, vol 4, Pp 1-6, 2013.
[6] Simon Ho , Yung-Li Lee, Hong-Tae Kang , Cheng J. Wangd, “Optimization Of A Crankshaft
Rolling Process For Durability”, International Journal Of Fatigue, International Journal Of
Fatigue 31,Pp. 799–808,2009.
[7] Rajesh M. Metkar, Vivek K. Sunnapwarb, Subhash Deo Hiwasec, VidyaSagar Ankid, Mahendra
Dumpa,“Evaluation Of Fem Based Fracture Mechanics Technique To Estimate Life Of An
Automotive Forged Steel Crankshaft Of A Single Cylinder Diesel Engine”,Procedia Engineering,
Procedia Engineering 51,Pp. 567 – 572,2013.
[8] M. Fonte, M. De Freitas, “Marine Main Engine Crankshaft Failure Analysis: A Case Study”,
Engineering Failure Analysis 16, Pp. 1940 – 1947,2009.
[9] Farzin H. Montazersadgh And Ali Fatemi, “Dynamic Load And Stress Analysis Of A Crankshaft”,
Sae International, 2007-01-0258
NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 6 JUNE.-2015
8 | P a g e  
 
[10] K.S. Choi, J. Pan, “Effects Of Pressure-Sensitive Yielding On Stress Distributions In
Crankshaft Sections Under Fillet Rolling And Bending Fatigue Tests”, International Journal Of
Fatigue 31 Pp.1588–1597,2009.
[11] Jing Zhao, Shijie Wang,” Analysis For Fatigue Failure Causes On A Large-Scale
Reciprocating Compressor Vibration By Torsional Vibration”, Procedia Engineering, Procedia
Engineering 74,Pp. 170 – 174,2014.
[12] W.Y. Chien , J. Pan ,_, D. Close , S. Hob, Fatigue” Analysis Of Crankshaft Sections Under
Bending With Consideration Of Residual Stresses”, International Journal Of Fatigue 27 Pp. 1–19,
2005.
[13] Paul Spiteri, Simon Ho And Yung-Li Lee, “Assessment Of Bending Fatigue Limit For
Crankshaft Sections With Inclusion Of Residual Stresses”. International Journal Of Fatigue, 29
Pp.318–329, 2008
[14] Xuanyang Leia,_, GuicaiZhanga, Song Xigengb, Jin Chena, Guangming Dong,“Simulation
On The Motion Of Crankshaft With Crack In Crankpin-Web Fillet Region”Journal Of Sound And
Vibration, 295 Pp.890–905,2006.
[15] K.S. Choi, J. Pan, “Simulations Of Stress Distributions In Crankshaft Sections Under Fillet
Rolling And Bending Fatigue Tests”, International Journal Of Fatigue 31 (2009),Pp. 544–557.
[16] M. Fonte , M. De Freitas, Marine Main Engine Crankshaft Failure Analysis: “A Case
Study,Engineering Failure Analysis, Engineering Failure Analysis” 16 Pp. 1940–1947,2009.

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FEA OF A CRANKSHAFT IN CRANK-PIN WEB FILLET REGION FOR IMPROVING FATIGUE LIFE

  • 1. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 FEA OF A CRANKSHAFT IN CRANK-PIN WEB FILLET REGION FOR IMPROVING FATIGUE LIFE Mr. Mathapati N. C. Department Mechanical engineering, Jaihind College of Enginnering, Kuran,Savitribai Phule Pune University,[MS] India Dr. Dhamejani C. L.  Department Mechanical engineering, Jaihind College of Enginnering, Kuran,Savitribai Phule Pune University,[MS] India ABSTRACT   A crankshaft is often designed with a fillet radius to improving fatigue life of crankshaft. The fatigue life of crankshaft is depend on the proper fillet radius. This fillet radius is changes than fatigue life is also changes of crankshaft. In most of the time fatigue failure is occur in crank-pin web fillet region. The crankshaft fillet rolling process is one of the commonly adopted methods in engineering to improve fatigue life of the crankshaft. A finite element analysis is implemented to approximate the stress distribution induced in the crankpin fillet region. The modelling of crankshaft is created by Creo-parametric. Finite element analysis is performed to obtain the variation of stress at critical locations and fatigue life of the crank shaft using the ANSYS software and applying the boundary conditions. Radius of fillet is changes in model of crankshaft to improvement in fatigue life. This work in doing for optimization of a crankshaft in crank-pin web fillet region with fatigue life as well as to study a relation between fillet radius/diameter of crankpin to fatigue life. . KEYWORDS— Crankshaft failure, fatigue, Fatigue life estimation, Finite element analysis. INTRODUCTION Crankshaft is a large component with a complex geometry in the engine which converts the reciprocating displacement of the piston to a rotary motion. The function of the crankshaft is to convert the convert mechanical energy of the piston being driven back and forth by the pneumatic energy provided by pressure change as a result of the combustion reaction. Crankshafts are high volume production internal combustion engine components and their most commonly used is in an automobile engine. In an engine, the reciprocating motion of the piston is linear and is converted into rotary motion using through the crankshaft. There are many applications of a crankshaft which range from small one cylinder engines to very large multi-cylinder marine crankshafts [1].
  • 2. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 2 | P a g e Crankshafts in automotive engines can experience a significant number of service cyclic loads. Since fatigue cracks initiated near the fillet lead to one of the primary failure mechanisms of automotive crankshafts, fillet rolling processes have been used to improve the fatigue lives of crankshafts for many years. The fillet rolling process induces compressive residual stresses near the fillet surface. The compressive residual stresses lower the fatigue driving stresses near the fillet surface due to operating loads and consequently increase the fatigue lives of crankshafts. As a crankshaft is subject to operating loads, the induced stresses at these high stress concentration areas could initiate fatigue cracks and lead to failure. A fillet rolling operation is one of the commonly used techniques to improve fatigue strength of a crankshaft because this rolling process introduces compressive residual stresses on the contact surface and sub-surface, which will prohibit fatigue cracks to initiate and continuously propagate. The invention regards to minimize stress in fillet region and increases fatigue life of crankshaft using rolling in fillet region of different radius and deep of rolling. The aim of invention is achieve static analysis through ANSYS stress value of crankshaft value to improve fatigue life of crank shaft [2]. LITERATURE REVIEW A more amount of work has been done on crankshaft optimization and analysis in fillet of crankshaft using experimental as wee as numerical simulation methods and finite element analysis (FEA). But fewer researches have carried on the radius of fillet with FEA. The basic literature available is provided the Mahesh L. Raotole, D. B. Sadaphale, and J. R.Chaudhari presented the Prediction of Fatigue Life of Crank Shaft using S-N Approach [4]. Sanjay B, V M Nandedkar and Surender Kumar Kaundal explains finite element analysis approach for stress analysis of crankshaft under dynamic loading [5]. Paul Spiteria Simon Ho, Yung-Li Lee are explained assessment of bending fatigue limit for crankshaft sections with inclusion of residual stresses [6]. Rajesh M.Metkar, Vivek K.Sunnapwar published Evaluation of FEM based fracture mechanics technique to estimate life of an automotive forged steel crankshaft of a single cylinder diesel engine[7]. PROBLEM DEFINITION Crankshaft is one of the critically loaded components in engine. Fatigue is a source of crankshaft failure. Although, traditionally, crankshaft damages are attributed to wear and lubrication sources, fatigue is responsible for a significant number of crankshaft failure.[8] Fatigue exists when cyclic stresses/deformations occur in an area on a component. The cyclic stresses/ deformations have mainly many origins, in that majorly fluctuating loads, torsion and bending on crank shaft. If number of cylinder are increases this parameter are more affected for the crankshaft fatigue failure. In Fig.1 fatigue failure occur in fillet region of crankshaft. Fig. 1 Final failure on fillet of crankshaft
  • 3. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 3 | P a g e     DESIGN CALCULATION For the project work using paggio vehicle of engine model G 400 WG III. The technical specification of engine is in Table I. TABLE I The Technical Specification of Engine Capacity 395 cc Number of Cylinders 1 Bore × Stroke 86 x 68 mm Compression Ratio 09:01 Maximum Power 8.1hp @ 3600 rpm Maximum Torque 16.7 Nm @ 2200 rpm Maximum gas pressure 25 bar Fillet Radius 3.5 Force on the Piston Fp = Area of the bore x Max. Combustion pressure = π x D2 xPmax = 14.52 KN In order to find the thrust in the connecting rod (FQ), We should first find out the angle of inclination of the Connecting rod with the line of stroke (i.e. angle Ø). We know that Sin Ø =(Sin Ɵ/(L/R)) = sin 350 /4 Which implies Ø = 8.24° We know that thrust in the connecting rod FQ = FP/COSƟ From this we have, Thrust on the connecting rod FQ= 14.67 KN Thrust on the crank shaft can be split into Tangential Component and the radial component. 1) Tangential force on the crank shaft, FT= FQ sin (θ+ Ø) =10.05 KN 2) Radial force on the crank shaft, FR= FQcos (θ+ Ø) = 10.68 KN Reactions at bearings (1 & 2) due to tangential force is given by, HT1=HT2 = (FT ×b1)/b = 5.02KN (Since b1=b2=b/2) Similarly, Reactions at bearings (1 & 2) due to radial force is given by, HR1=HR2 = (FR ×b1)/b = 5.34KN (Since b1=b2=b/2)
  • 4. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 4 | P a g e FEA APPROCH Finite element analysis of crankshaft is done by geometry generation using creo-Parametri software and analysis is using through the ANSYS 14.5 WORKBENCH software. Using proper type of loading and boundary condition are very important in finite element analysis. A. Generation of Geometry of Crankshaft using Creo-Parametric From the measuring all parameter of actual crankshaft of Paggio vehicle of engine model G 400 WG III to the drawing, the dimensions of crankshaft, solid model is generated using Creo-Parametric software. Fig.2 shows the solid model of the forged steel crankshaft from actual dimension. After completion of solid model save as this part as IGES for Exporting into ANSYS WORKBENCH Environment. Fig.2 Generated Geometry of Crankshaft B. Engineering Data In the engineering data add the basic property of crankshaft. Material Details Material Type: - Forged Steel Designation: - 42CrMo4 Yield strength (MPa):- 680 Ultimate tensile strength (MPa):- 850 Elongation (%):-13 Poisson ratio:-0.3 C. Mesh Generation Import IGES format model in ANSYS WORKBENCH simulation module. Quadratic tetrahedral elements are used to mesh the crankshaft finite element geometry. Fig.3 Meshed Model of Crankshaft
  • 5. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 5 | P a g e Tetrahedral elements are used for meshing the imported complex geometries to the ANSYS WORKBENCH software. In Fig.3 shows the meshed model of crankshaft of 17789 numbers of nodes and 9615 number of elements. D. Boundary conditions Boundary conditions are playing the important role in finite element analysis. The bearing support is fixed and applies tangential and radial force on crankshaft. Fig.4 shows the apply remote displacement for bearing support fixed and apply forces on crankpin. Fig.4 Boundary conditions for crankshaft E. Von Misses Stress After compilation boundary condition find out the critical point (maximum stress) on crankshaft to know the where crack is occurring. Fig.5 shows the von misses stress on the crankshaft. From figure maximum stress in on the fillet of crankshaft. Fig.5 Von Misses Stress
  • 6. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 6 | P a g e F. Fatigue life Using fatigue tool obtain fatigue life of crankshaft and obtain same for the various radius of fillet in crankpin region. Fig.6 shows the fatigue life of crankshaft. From the figure the minimum fatigue life is obtained on the maximum Von misses stress occur means the fatigue crack starts from that region. To comparing fatigue life of different fillet radius in crankpin following the same method to obtain fatigue life. In the geometry only changes the fillet radius and other boundary conditions are same. Fig.6 Fatigue life of crankshaft RESULTS The results are obtained using the FEA using ANSYS software for 3.5 fillet radius 3.7404×105 fatigue life of existing forged crankshaft. The crack start from the where the maximum von misses stress is formed. Therefore, fatigue life of forged steel crankshaft obtained for different fillet radius r to crank pin diameter d ratio and it is shown below. It is seen from the table, fatigue life of crankshaft increases with the increase in r/d ratio. Similarly, the calculation for r/d = 0.03, 0.06, 0.08 and 0.1 and software calculation results as given in the following Table3. TABLE III Number Of Cycles To Failure For Different r/d Ratio Sr. No. Fillet Radius r/d Ratio Number of Cycles to Failure 1 1.5 0.03 2.4951×100000 2 2.5 0.06 3.1685×100000 3 3.5 0.08 3.7404×100000 4 4 0.1 5.7842×100000 5 4.5 0.1125 8.1389×100000 To obtain above results only changes in the radius of fillet of crankpin all other parameters and boundary conditions are same. Results are obtained from the ANSYS WORKBENCH 14.5 using fatigue tool.
  • 7. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 7 | P a g e     CONCLUSIONS In this paper finite element analysis use to calculating number of cycles to failure of crankshaft. The maximum stress and deformation appears at the centre of crankpin fillet between the crankshaft journal and crank cheeks, and near the central point journal. The edge of main journal is maximum stress area in the crankshaft. FEA analysis using ANSYS WORKBENCH FROM fatigue tool is very efficient and simple method for achieving fatigue at different loading condition according to force applied to the crankshaft. The use of numerical method such as Finite Element Method now a day’s commonly used to gives detail information about various structure or components. The r/d ratio is increases than Von misses stress are decreases as well as number of cycles to failure in increases. REFERENCES [1] George E. Diete, Mechanical Metallurgy, 3rd Edition ,McGraw Hill Education, 2013, Pp. 375 – 431 [2] Warren C. Young Richard G. Budynas, Roark’s Formulas For Stress And Strain, Seventh Edition New York Chicago San Francisco Lisbon London , Pp. 771 - 799 , 2002. [3] Walter D. Pilkey Deborah F. Pilkey, Peterson’s Stress Concentration Factors, Third Edition, John Wiley & Sons, Inc., ,Pp. 422 – 427,2007. [4] Mahesh L. Raotole, Prof. D. B. Sadaphale, Prof. J. R.Chaudhari, “Prediction of Fatigue Life of Crank Shaft using S-N Approach”,International Journal of Emerging Technology and Advanced Engineering, vol.3, Pp. 427-454,2013. [5] Sanjay B, V M Nandedkar and Surender Kumar Kaundal explains “finite element analysis approach for stress analysis of crankshaft under dynamic loading”, INTERNATIONAL Journal of Scientific & Engineering Reserch, vol 4, Pp 1-6, 2013. [6] Simon Ho , Yung-Li Lee, Hong-Tae Kang , Cheng J. Wangd, “Optimization Of A Crankshaft Rolling Process For Durability”, International Journal Of Fatigue, International Journal Of Fatigue 31,Pp. 799–808,2009. [7] Rajesh M. Metkar, Vivek K. Sunnapwarb, Subhash Deo Hiwasec, VidyaSagar Ankid, Mahendra Dumpa,“Evaluation Of Fem Based Fracture Mechanics Technique To Estimate Life Of An Automotive Forged Steel Crankshaft Of A Single Cylinder Diesel Engine”,Procedia Engineering, Procedia Engineering 51,Pp. 567 – 572,2013. [8] M. Fonte, M. De Freitas, “Marine Main Engine Crankshaft Failure Analysis: A Case Study”, Engineering Failure Analysis 16, Pp. 1940 – 1947,2009. [9] Farzin H. Montazersadgh And Ali Fatemi, “Dynamic Load And Stress Analysis Of A Crankshaft”, Sae International, 2007-01-0258
  • 8. NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 2, ISSUE 6 JUNE.-2015 8 | P a g e     [10] K.S. Choi, J. Pan, “Effects Of Pressure-Sensitive Yielding On Stress Distributions In Crankshaft Sections Under Fillet Rolling And Bending Fatigue Tests”, International Journal Of Fatigue 31 Pp.1588–1597,2009. [11] Jing Zhao, Shijie Wang,” Analysis For Fatigue Failure Causes On A Large-Scale Reciprocating Compressor Vibration By Torsional Vibration”, Procedia Engineering, Procedia Engineering 74,Pp. 170 – 174,2014. [12] W.Y. Chien , J. Pan ,_, D. Close , S. Hob, Fatigue” Analysis Of Crankshaft Sections Under Bending With Consideration Of Residual Stresses”, International Journal Of Fatigue 27 Pp. 1–19, 2005. [13] Paul Spiteri, Simon Ho And Yung-Li Lee, “Assessment Of Bending Fatigue Limit For Crankshaft Sections With Inclusion Of Residual Stresses”. International Journal Of Fatigue, 29 Pp.318–329, 2008 [14] Xuanyang Leia,_, GuicaiZhanga, Song Xigengb, Jin Chena, Guangming Dong,“Simulation On The Motion Of Crankshaft With Crack In Crankpin-Web Fillet Region”Journal Of Sound And Vibration, 295 Pp.890–905,2006. [15] K.S. Choi, J. Pan, “Simulations Of Stress Distributions In Crankshaft Sections Under Fillet Rolling And Bending Fatigue Tests”, International Journal Of Fatigue 31 (2009),Pp. 544–557. [16] M. Fonte , M. De Freitas, Marine Main Engine Crankshaft Failure Analysis: “A Case Study,Engineering Failure Analysis, Engineering Failure Analysis” 16 Pp. 1940–1947,2009.