Steel & Nodular Iron fatigue Life Calculation
Mat.
No.
5
High Cycle S-N Curve (No. cycles > 10 )
Specify calculation
Step 1
1- No. of cycles for max & min σ
2- Reversible σ for required no. of cycles
3- Max σ for given no. of cycles and Min σ
4- Min σ for given no. of cycles and Max σ
Choose number from above (1, 2, 3, or 4):
1
-
Input parameters
Step 2
Step 3
Step 4
1,00E+03
1,00E+06
Stress units (ksi=1, MPa=2)
Material number (1 through 16)
Material chosen=
Ultimate stress of chosen material=
Endurance limit of chosen material=
2
13
SAE 1045 TREFILADO (3/4" - 1.1/4")
630
MPa
315
MPa
Input values
Max σ in cycle=
1,22E+02
MPa
Min σ in cycle=
3,20E+01
MPa
Goodman equivalent reversible σ =
5,13E+01
MPa
Output
No. of cycles=
1,85E+15
Cycles
Theoretical
567
315
Mean Correction (Goodman)
1,00E+03
567
1,00E+06
277
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Note: Choose appropriat
S-N Unnotched Curve - Goodman Mean Stress Corre
400
350
Sr, Stress Range (MPa)
300
250
200
150
100
50
50
0
1,00E+03
1,00E+04
1,00E+05
N (n. of cycles)
Stress (MPa)
Name
Ultimate
Endurance
Yield
Steel
MS 320
MS 314 - Gr50
MS 314 - Gr42
Gr 80
ASTM A36
SAE 1010
SAE 1020
SAE 1045
ASTM A500 GRAU A
ASTM A500 GRAU B
ASTM A500 GRAU C
A572 GRAU 50
SAE 1045 TREFILADO (3/4" - 1.1/4")
SAE 1045 LAMINADO (3/4" - 1.1/4")
310,1
447,9
413,4
654,6
400,0
800
420
585
310
400
425
450
630
565
124,0
151,6
137,8
172,3
200,0
400,0
210,0
292,5
155,0
200,0
212,5
225
315
282,5
206,7
344,5
289,4
551,2
250,0
500
350
450
270
315
345
345
530
310
User Defined 1
630
315
1000
Nodular 80-55-06
Nodular 100-70-03
551,2
689,0
220,5
261,8
344,5
482,3
User Defined 2
800
400
250
-
-
-
Nodular Iron
-
Note: Choose appropriate units in cell C12 before filling in user defined values above
n Mean Stress Correction
315
277
Theoretical
Goodman Correction (Unnoteched)
a
1020,6
567
b
-0,085
1,00E+06
Calculation - N° of Cycles
f
0,9
Option 1 (Step 1) Option 2 (Step 1)
Smax
1,22E+02
Smin
3,20E+01
Sr
5,13E+01
N
1,85E+15
1,85E+15
-
Option 3 (Step 1)
-
Option 4 (Step 1)
-
-
-
Working Assumptions
Hours worked a day
12
22
Days worked a month
12
Months worked a year
Period
Hour
Day
Month
Year
5 years
N° of cycles
6
72
1584
1,90E+04
9,50E+04
Life Estimation
Max N° of Cycles
1,85E+15
Maximum of Years
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