# # Fitted Curve. Manual fit near Nf=1 and Fatigue limit. FAC Jun09. # SAE4140 Rc=49 ElecFurn, VacDegas, LadleRefined, ConCast152x152mm, # Normalized, Forged 2150 reduced 83%, Quench from 1550F into # 150F Oil, Tempered 500F, 100%Martensite, # Inclusions TypeA-0.5T,0H, TypeBC=0, TypeD(glob)=1T0.5H # Test: UoToledo #FileType= strain_life #DataType= fitted # saedigcurve_v2.2.f starts. #Name= SAE4140 #Name= AisiIt_77 #Stress_units= MPa #Strain_units= strain #Sy= 1602.0 #Su= 1679.9 #E= 203000 (average of 7) TensTest=E=205300 #monotonic_K= 2599.7 #monotonic_n= 0.077 #FractureStrain= 0.013 #FractureStress= 1702. #%RA= 1.5 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 460 #reported as 477 #Hardness, Rockwell C= 49 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= True #Ladle Refined= True #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.4 #Manganese, %= 0.85 #Phosphorus, %= 0.013 #Sulfur, %= 0.077 #Silicon, %= 0.28 #Copper, %= 0.23 #Nickel, %= 0.15 #Chromium, %= 0.99 #Molybdenum, %= 0.21 #Aluminum, %= 0.010 #Tin, %= 0.009 # SAE4140 AisiIt_77 BHN= 460 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29443. KSI, 203. GPA K' = 783.0 KSI, 5399.MPA #YIELD,0.2%= 232. KSI, 1602. MPA N' = 0.1930 #ULT. STRG.= 244. KSI, 1680. MPA F. STRG COEF= 396.8 KSI, 2736.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.1411 #N = 0.0000 FAT DUCT COEF= 0.0295 #RED. IN AREA = 1.5 F.DUCT EXP, c=-0.7309 #T. FRAC. STG.= 246.9 KSI, 1702. MPA Exp Cyc Yld = 236. Ksi,1627.MPA #T. FRAC. STR.= 0.013 Fit Cyc Yld = 220. Ksi,1520.MPA #No. fatigue data points= 21 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .013 1 1702. 0. 0.0046 203000. #Fitted_point manually. 0.00945 50 1517.9 0. 0.00198 203000. #Fitted_point 0.00806 100 1417.2 0. 0.00108 203000. #Fitted_point 0.00700 200 1310.9 0. 0.00054 203000. #Fitted_point 0.00592 500 1164.1 0. 0.00019 203000. #Fitted_point 0.00528 1000 1055.0 0. 0.00008 203000. #Fitted_point 0.00473 2000 953.1 0. 0.00003 203000. #Fitted_point 0.00411 5000 832.8 0. 0.00001 203000. #Fitted_point 0.00371 10000 752.6 0. 0.00000 203000. #Fitted_point 0.00335 20000 680.7 0. 0.00000 203000. #Fitted_point 0.00294 50000 596.8 0. 0.00000 203000. #Fitted_point 0.00266 100000 540.6 0. 0.00000 203000. #Fitted_point 0.00241 200000 489.8 0. 0.00000 203000. #Fitted_point .0023 300000 466. 0. 0.00000 203000. #Fitted_point manually .0023 10000000 466. 0. 0.00000 203000. #Fitted_point manually #