# # Fitted Curve: # SAE4140 Rc=40, AISI Iter 69, 100%Matensite # ElecFurn. LadleRef., IngotCast, HotRoll to 57mm bar # Specimens Q+ Temp. Inclus.: no TypeA,B,C, TypeD=1.0 # Test: UoWaterloo # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4140 #Name= AisiIt_69 #Stress_units= MPa #Strain_units= strain #Sy= 1341.0 #Su= 1474.2 #E= 201000 #monotonic_K= 1894.6 #monotonic_n= 0.056 #FractureStrain= 0.80 #FractureStress= 1786 #%RA= 52.5 #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 40 #BHN= 371 #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, %= 0.001 #Titanium, %= 0.003 #Calcium, %= 0.00 #Cobalt, %= 0.001 #Zirconium, %= 0.001 #Boron, %= 0.0004 #Tin, %= 0.009 #Nitrogen, ppm= 103 # SAE4140 AisiIt_69 BHN= 371 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29153. KSI, 201. GPA K' = 210.5 KSI, 1451.MPA #YIELD,0.2%= 194. KSI, 1341. MPA N' = 0.0790 #ULT. STRG.= 214. KSI, 1474. MPA F. STRG COEF= 212.7 KSI, 1466.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0587 #N = 0.0000 FAT DUCT COEF= 1.1401 #RED. IN AREA = 52.5 F.DUCT EXP, c=-0.7437 #T. FRAC. STG.= 259.0 KSI, 1786. MPA Exp Cyc Yld = 129. Ksi, 888.MPA #T. FRAC. STR.= 0.800 Fit Cyc Yld = 129. Ksi, 888.MPA #No. fatigue data points= 22 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' #NOTE!! Points near fatigue limit adjusted to fit data. FAC June09 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 1.14742 1 1114.7 0. 1.14188 201000. #Fitted_point 0.68790 2 1094.4 0. 0.68245 201000. #Fitted_point 0.35109 5 1068.1 0. 0.34578 201000. #Fitted_point 0.21209 10 1048.6 0. 0.20687 201000. #Fitted_point 0.12897 20 1029.5 0. 0.12385 201000. #Fitted_point 0.06795 50 1004.9 0. 0.06295 201000. #Fitted_point 0.04268 100 986.7 0. 0.03777 201000. #Fitted_point 0.02751 200 968.8 0. 0.02269 201000. #Fitted_point 0.01628 500 945.8 0. 0.01157 201000. #Fitted_point 0.01156 1000 928.6 0. 0.00694 201000. #Fitted_point 0.00867 2000 911.6 0. 0.00413 201000. #Fitted_point 0.00645 5000 888.6 0. 0.00203 201000. #Fitted_point 0.00546 10000 870.1 0. 0.00113 201000. #Fitted_point 0.00480 20000 849.4 0. 0.00057 201000. #Fitted_point 0.00423 50000 814.4 0. 0.00018 201000. #Fitted_point 0.0035 116244 701 0.0 0.00000 203000 #Fitted_point data 0.0032 149140 642 0.0 0.00000 199000 #Fitted_point data 0.0032 10000000 642 0.0 0.00000 199000 #Fitted_point data #