IJRI-ME-02-030 FATIGUE FAILURE ANALYSIS OF STEAM TURBINE SHAFT USING FEM TECHNIQUE

International Journal of Research and Innovation on Science, Engineering and Technology (IJRISET)
Materials AISI 4130
Steel
Temperature
THERMAL ANALYSIS
Solid shaft
C-276
alloy
AISI 4130
Steel
Hallow shaft
C-276
alloy
591.63 579.95 588.53 577.73
Heat flux 0.66966 0.42049 0.60857 0.38725
Thermal
error
Materials AISI 4130
Steel
Total deformation
HZ 1
Total deformation
HZ 2
Total deformation
HZ 3
Total deformation
HZ 4
Total deformation
HZ 5
Materials AISI 4130
Steel
7.4585e6 1.7605e6 4.7633e6 9.8352e5
MODEL ANALYSIS
Solid shaft
C-276
alloy
AISI 4130
Steel
Hallow shaft
C-276
alloy
144.92 143.39 168.41 166.42
145.18 143.65 177.22 175.15
418.62 413.79 372.42 368.31
419.11 414.27 382.68 378.51
709.51 695.61 475.99 470.09
FATIGUE ANALYSIS
Solid shaft
C-276
alloy
AISI 4130
Steel
Hallow shaft
C-276
alloy
LIFE 5e11 5e11 5e11 5e11
Damage 1.034 0.86538 3.7329 3.2395
HALLOW SHAFT WITH CENTER SUPPORT BEARING
TABLE
Materials
STRUCTURAL ANALYSIS
C-276 alloy
Total deformation 0.22403
Stress 65.783
Strain 0.00041147
Materials
THERMAL ANALYSIS
C-276 alloy
Temperature 577.73
Heat flux 0.38723
Thermal error 9.8352e5
Materials
MODEL ANALYSIS
C-276 alloy
Total deformation HZ 1 372.95
Total deformation HZ 2 383.67
Total deformation HZ 3 953.67
Total deformation HZ 4 975.5
Total deformation HZ 5 1190.4
Materials
LIFE
FATIGUE ANALYSIS
C-276 alloy
5e11
Damage 2.8291
CONCLUSION
This thesis work deals with “FATIGUE FAILURE ANAL-
YSIS OF STEAM TURBINE SHAFT USING FEM TECH-
NIQUE” to compare solid and hollow shafts; to suggest
best material and suitable location for the center bearing.
Structural, model, thermal and fatigue analysis is done
on solid and hollow shafts along with bearings by varying
materials; as per the analysis results hollow shaft is
having little bit high stress and deformation but these are
within the limit only while considering factor of safety.
Bearing was installed near high pressure blades for additional
support to use hollow shaft to reduce stress concentration;
then above analysis was conducted to evaluate
results.
As per the analysis work results hollow shaft with center
bearing and C-276 material will be the better option; using
these conditionsshaft weight can be reduced up to
51kgs [^16%] which interns increases the mechanical efficiency.
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