# # Fitted Curve. # SAE4140 Rc=38, Q+T, 100%Martensite # ElecFurn, LadleRefined, IngotCast, HotRolled 57mm bar, # Specimens Q+Temp. Type D inclus.= 1.0 # Test: UoWaterloo # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4140 #Name= AisiIt_68 #Stress_units= MPa #Strain_units= strain #Sy= 1255.1 #Su= 1355.1 #E= 199000 #monotonic_K= 1610.4 #monotonic_n= 0.040 #FractureStrain= 0.50 #FractureStress= 1333. #%RA= 38.8 #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 38 #BHN= 353 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= True #Ingot Cast= True #Continuous Cast= False #Martensite, %= 100 #Carbon, %= 0.41 #Manganese, %= 0.96 #Phosphorus, %= 0.009 #Sulfur, %= 0.009 #Silicon, %= 0.23 #Copper, %= 0.20 #Nickel, %= 0.16 #Chromium, %= 0.99 #Molybdenum, %= 0.2 #Vanadium, %= 0.00 #Columbium/Niobium, %= 0.00 #Aluminum, %= 0.031 #Lead, %= 0.007 #Titanium, %= 0.003 #Calcium, %= 0.00 #Cobalt, %= 0.001 #Zirconium, %= 0.001 #Boron, %= 0.0004 #Tin, %= 0.009 #Nitrogen, ppm= 103 # SAE4140 AisiIt_68 BHN= 353 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 28863. KSI, 199. GPA K' = 152.8 KSI, 1054.MPA #YIELD,0.2%= 182. KSI, 1255. MPA N' = 0.0392 #ULT. STRG.= 197. KSI, 1355. MPA F. STRG COEF= 159.6 KSI, 1100.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0327 #N = 0.0000 FAT DUCT COEF= 3.0213 #RED. IN AREA = 38.8 F.DUCT EXP, c=-0.8351 #T. FRAC. STG.= 193.3 KSI, 1333. MPA Exp Cyc Yld = 120. Ksi, 826.MPA #T. FRAC. STR.= 0.500 Fit Cyc Yld = 119. Ksi, 818.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!! Manually fit near Nf=1 and fatigue limit. FAC Jun09 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .50 1 1333 0. .4933 199000. #Fitted_point manually 0.00960 2000 851.3 0. 0.00532 199000. #Fitted_point 0.00664 5000 825.1 0. 0.00250 199000. #Fitted_point 0.00547 10000 806.0 0. 0.00142 199000. #Fitted_point 0.00477 20000 787.7 0. 0.00081 199000. #Fitted_point 0.00424 50000 764.7 0. 0.00040 199000. #Fitted_point 0.00399 100000 748.2 0. 0.00023 199000. #Fitted_point 0.00382 200000 732.5 0. 0.00014 199000. #Fitted_point 0.00365 500000 712.4 0. 0.00007 199000. #Fitted_point 0.00355 1000000 697.4 0. 0.00004 199000. #Fitted_point 0.00346 2000000 682.6 0. 0.00003 199000. #Fitted_point 0.00346 10000000 682.6 0. 0.00003 199000. #Fitted_point manually #