SAE Standard Fatigue Data File format

#SAE Standard Fatigue Data File format #
Pick one: #FDE_plot #FDE_fit # #
#
# SAE8620 Thru Carburized HRc= 65,  
# Material cyclically hardens to elastic conditions. MacSteel Ht. M10367
# ElecFurnace, LadleRef, ConCast(152x152mm), HotRolled to 29.7mm bar
# Carburized, reaustenitized 1575F 30min,  and isothermally transformed at 
# 450F for 25min to achieve 75% martensite and 25% bainite. 
# Original Chem.= 0.21wt%C .93Mn .009P .032S .25Si .15Cu .46Ni .50Cr
# .20Mo 0V 0Nb .024Al 0Pb .002Ti 0Ca .01Co 0Zr .0003B .01Sn
# 9ppm_O 63ppm_N
# Inclusions: TypeA=1.2T 0H, TypeB=0.5T 0.3H, TypeC=0.2T, TypeD=1.5T 0.5H
# Hardness Rc=63.2 near surface, 55 near center
# Test:UoWaterloo, A.Rteil, T.Topper, June2007

#FileType= strain_life
#DataType= raw
#Name= SAE8620
#Name= AisiIt_88
#Name= ThruCarburized
#Stress_units= MPa
#Strain_units= strain
#Sy= 1206.0
#Su= 1390.0
#E= 183600. average of initial modulii.
#reported:  #E= 201500
#monotonic_K= 8012.0
#monotonic_n= 0.304
#FractureStrain= 0.018  (from tensile curves)
#FractureStress= 1390.
#%RA= 0  not measurable.
#MaterialForm= bar
#FailureDef= 50% load drop
#Hardness, Rockwell C= 65 
#BHN= 722
#Note: This file is all specimens, with or without #fisheye cracks


#StrAmp     2Nf   StsAmp So PlsStrAmp InitMod  Comments
0.00786       130  1376   0     0     175064 #8 retest.  Surface init.
#DELETED 0.00801       924  1261   0     0     157428 #10  probably small #fisheye near surf
                               #Spec.10 is a retest.  The initial modulus is too low.  Delete.
0.00800      2586  1399   0     0     174875 #1  Surface init.
0.00652      3182  1190   0     0     182515 #20  Surface init.
0.00634      4242  1226   0     0     193375 #5  retest.  maybe #fisheye near surf
0.00558      4574   976   0     0     174910 #17  Surface init.
#DELETED 0.00402      5588   759   0     0     188806 #6  Surface init. Possible Knife edge.
                                  #Spec.6 is a retest.  Possibly it is a knife edge.  
                                  #Crack initiated near knife edge position.   Delete.
0.00655     83918  1150   0     0     175573 #15  Small #fisheye at 1/3 diam.
0.00553    252520  1028   0     0     185895 #18  Medium #fisheye at 1/3 diam.
0.00547    278100   982   0     0     179525 #14 retest Large #fisheye 30% of diam. At center.
0.00499    304294   918   0     0     183968 #2  Large #fisheye at center of diam.
0.00498    492914   920   0     0     184739 #19  Large #fisheye near center.
0.00503    532706   959   0     0     190656 #16  Large #fisheye at 1/3 diam.
0.00448   6685830   822   0     0     183482 #3  medium #fisheye at 1/3 diam.
0.00346  10000000   643   0     0     185838  #runout #11 retest as #12(missing)
0.00399  10000000   735   0     0     184211  #runout #4 retest as #5

0.00400  10000000   763   0     0     190750  #runout #13 retest as #14
0.00349  10000000   644   0     0     184527  #runout #7 retest as #8
0.00349  10000000   650   0     0     186246  #runout #9 retested as #10
              
#average Emod=                        182230.  with #10
#average Emod=                        183608.  without no. 10


#Bainite, %= 25
#Martensite, %= 75

#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, %= 0.001
#Titanium, %= 0.002
#Calcium, %= 0.00
#Cobalt, %= 0.006
#Zirconium, %= 0.001
#Boron, %= 0.0003
#Tin, %= 0.006
#Oxygen, ppm= 9
#Nitrogen, ppm= 63
#
#