SAE Standard Fatigue Data File format

#SAE Standard Fatigue Data File format #
Pick one: #FDE_plot #FDE_fit # #
#
# Fitted Curve !
# SAE8620 Thru Carburized Rc= 61
# Material cyclically hardens to elastic condition.
# ElecFurnace, LadleRefined, ConCast(152x152) HotRolled to 29.7mm bar
# Specimens machined, carburized, reaustenitized and isothermally transformed
# to achieve 100% martensite and 0%bainite.
# Inclusions: TypeA=1.2T 0.H, TypeB=0.5T 0.3H, TypeC=0.2T, TypeD=1.5T 0.5H
# Test: UoWaterloo, A.Rteil and T.Topper, June 2007
# saedigcurve_v2.2.f starts.
#FileType= strain_life
#DataType= fitted
#Name= SAE8620
#Name= AisiIt_87
#Stress_units= MPa
#Strain_units= strain
#Sy= 1252.0
#Su= 1485.0
#E= 198000
#monotonic_K= 5575.0
#monotonic_n= 0.240
#FractureStrain= 0.0125
#FractureStress= 1330
#%RA= 0 (not measurable)
#MaterialForm= bar
#FailureDef= 50% load drop
#Hardness, Rockwell C= 61
#BHN= 670
#Basic Oxygen= False
#Electric Furnace= True
#Vacuum Degas= False
#Ladle Refined= True
#Ingot Cast= False
#Continuous Cast= True
#Martensite, %= 100
#Carbon, %= 0.21
#Manganese, %= 0.83
#Phosphorus, %= 0.009
#Sulfur, %= 0.032
#Silicon, %= 0.25
#Copper, %= 0.15
#Nickel, %= 0.46
#Chromium, %= 0.5
#Molybdenum, %= 0.2
#Vanadium, %= 0.00
#Columbium/Niobium, %= 0.00
#Aluminum, %= 0.024
#Lead, %= 0.000
#Titanium, %= 0.002
#Calcium, %= 0.00
#Cobalt, %= 0.010
#Zirconium, %= 0.000
#Boron, %= 0.0003
#Tin, %= 0.010
#Oxygen, ppm= 9
#Nitrogen, ppm= 63
# SAE8620    AisiIt_87  BHN=  670 Fn=    0
#          Monotonic Props.       Cyclic Props.
#ELAS. MOD.= 28717. KSI,  198. GPA     K'        =   0.0 KSI,     0.MPA
#YIELD,0.2%=   182. KSI, 1252. MPA     N'        = 0.0000
#ULT. STRG.=   215. KSI, 1485. MPA     F. STRG COEF=  504.5 KSI, 3478.MPA
#K       =      0.0 KSI,      0. MPA   F.STRG EXP, b=-0.1175
#N            = 0.0000                 FAT DUCT COEF=   0.0000
#RED. IN AREA =  0.0                   F.DUCT EXP, c= 0.0000
#T. FRAC. STG.= 192.9 KSI, 1330. MPA   Exp Cyc Yld  =    0. Ksi,   0.MPA
#T. FRAC. STR.= 0.013                  Fit Cyc Yld  =    0. Ksi,   0.MPA
#No. fatigue data points=   21
#
# NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n'
# NOTE!! Due to zero cyclic plasticity, material fit is on elastic strain vs life line.
#Stress_Units= MPa
# Total Strain   2Nf  Stress  Mean   Plastic Strain   Initial
#    Amp               Amp   Stress      Amp        Elastic Mod.
   0.01757          1    3478      0.       0      198000. #Fitted_point 
    .0080        1368    1521      0.       0      198000. #Fitted_point manually
   0.00287    5000000     568      0.       0      198000. #Fitted_point
    .00276   10000000     540      0.       0      198000. #Fitted_point manually
#
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