# # Fitted Curve ! # SAE8822 Thru Carburized HRc= 62 100%Martensite # Material cyclically hardens to mostly elastic condition. # ElecFurn. ConCast(279x375mm) HotRolled to 66.7mm bar, # Spec. machined, then Carburized (ground?) and polished. # Test: UoWaterloo, M.Khalil and T.Topper June2002 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE8822 #Name= AisiIt_60 #Name= ThruCarburized #Stress_units= MPa #Strain_units= strain #Sy= 1965. (is max stress. did not reach 0.2% offset.) #Su= 1965. #E= 202000 #monotonic_K= 4150.0 #monotonic_n= 0.119 #FractureStrain= 0.0105 #FractureStress= 1965. #%RA= 1.1 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 625 #Hardness, Rockwell C= 62 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.21 #Manganese, %= 0.9 #Phosphorus, %= 0.01 #Sulfur, %= 0.013 #Silicon, %= 0.25 #Copper, %= 0.22 #Nickel, %= 0.42 #Chromium, %= 0.52 #Molybdenum, %= 0.35 #Vanadium, %= 0.00 #Tin, %= 0.010 # SAE8822 AisiIt_60 BHN= 625 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29298. KSI, 202. GPA K' =****** KSI,*******MPA #YIELD,0.2%= 0. KSI, 0. MPA N' = 0.8475 #ULT. STRG.= 0. KSI, 0. MPA F. STRG COEF= 350.9 KSI, 2419.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0834 #N = 0.0000 FAT DUCT COEF= 0.0005 #RED. IN AREA = 1.1 F.DUCT EXP, c=-0.0984 #T. FRAC. STG.= 285.0 KSI, 1965. MPA Exp Cyc Yld = 1065. Ksi,7345.MPA #T. FRAC. STR.= 0.010 Fit Cyc Yld = 506. Ksi,3489.MPA #No. fatigue data points= 18 # # NOTE!! The Following Points are <b>FITTED DATA:</b> # NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Fatigue limit adjusted manually. FAC Aug2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 0.01252 1 2373.8 0. 0.00076 202000. #Fitted_point 0.01031 10 1984.6 0. 0.00049 202000. #Fitted_point 0.00973 20 1879.2 0. 0.00043 202000. #Fitted_point 0.00901 50 1747.8 0. 0.00036 202000. #Fitted_point 0.00850 100 1654.1 0. 0.00031 202000. #Fitted_point 0.00802 200 1565.0 0. 0.00027 202000. #Fitted_point 0.00742 500 1454.2 0. 0.00022 202000. #Fitted_point 0.00700 1000 1375.2 0. 0.00020 202000. #Fitted_point 0.00661 2000 1300.3 0. 0.00017 202000. #Fitted_point 0.00612 5000 1207.3 0. 0.00014 202000. #Fitted_point 0.00577 10000 1141.1 0. 0.00012 202000. #Fitted_point 0.00545 20000 1078.4 0. 0.00011 202000. #Fitted_point 0.00504 50000 1000.6 0. 0.00009 202000. #Fitted_point 0.00476 100000 945.4 0. 0.00008 202000. #Fitted_point 0.00449 200000 893.1 0. 0.00007 202000. #Fitted_point 0.00416 500000 828.3 0. 0.00006 202000. #Fitted_point 0.00392 1000000 782.3 0. 0.00005 202000. #Fitted_point 0.00370 2000000 738.8 0. 0.00004 202000. #Fitted_point 0.00342 5000000 684.9 0. 0.00003 202000. #Fitted_point 0.00323 10000000 646.7 0. 0.00003 202000. #Fitted_point 0.00323 11000000 646.7 0. 0.00003 202000. #Fitted_point manually #