# # Fitted Curve. Manual fit at Nf=1 and fatigue limit. # SAE4140 Rc=49 AISI Iter 98, 100%Martensite # ElecFurn. ConCast, Normalized 1650F, AsForged 2150F, 82.6% reduction # Incls.: TypeA=0.5T 0H TypeB,C=0, TypeD=1.0T 0.5M # Test: UoToledo # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4140 #Name= Iter098 #Units= MPa #Sy= 1622.2 #Su= 1818.3 #E= 205800 (average of 10 obs) #monotonic_K= 2466.5 #monotonic_n= 0.065 #FractureStrain= .555 #FractureStress= 2017 #%RA= 42.6 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 477 #may by 469 ? #Hardness, Rockwell C= 49 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.41 #Manganese, %= 0.87 #Phosphorus, %= 0.01 #Sulfur, %= 0.004 #Silicon, %= 0.24 #Copper, %= 0.10 #Nickel, %= 0.05 #Chromium, %= 0.9 #Molybdenum, %= 0.18 #Aluminum, %= 0.020 #Tin, %= 0.005 #Nitrogen, ppm= 58 # SAE4140 Iter098 BHN= 477 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29849. KSI, 206. GPA K' = 365.2 KSI, 2518.MPA #YIELD,0.2%= 235. KSI, 1622. MPA N' = 0.1056 #ULT. STRG.= 264. KSI, 1818. MPA F. STRG COEF= 418.3 KSI, 2884.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.1038 #N = 0.0000 FAT DUCT COEF= 3.6233 #RED. IN AREA = 42.6 F.DUCT EXP, c=-0.9831 #T. FRAC. STG.= 292.5 KSI, 2017. MPA Exp Cyc Yld = 189. Ksi,1306.MPA #T. FRAC. STR.= 0.555 Fit Cyc Yld = 191. Ksi,1314.MPA #No. fatigue data points= 19 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Manual fit at Nf=1 and fatigue limit. FAC Jun09 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .555 1 2017. 0. .5452 205800. #Fitted_point manually .02 280 1573 0. .0122 205800. #Fitted_point manually 0.01540 500 1481.8 0. 0.00820 205800. #Fitted_point 0.01091 1000 1397.5 0. 0.00412 205800. #Fitted_point 0.00843 2000 1315.9 0. 0.00203 205800. #Fitted_point 0.00662 5000 1208.9 0. 0.00075 205800. #Fitted_point 0.00581 10000 1127.5 0. 0.00033 205800. #Fitted_point 0.00523 20000 1047.0 0. 0.00014 205800. #Fitted_point 0.00464 50000 947.0 0. 0.00004 205800. #Fitted_point 0.00428 100000 878.1 0. 0.00002 205800. #Fitted_point 0.00397 200000 815.1 0. 0.00001 205800. #Fitted_point 0.00360 500000 739.7 0. 0.00000 205800. #Fitted_point 0.00334 1000000 687.8 0. 0.00000 205800. #Fitted_point 0.00311 2000000 639.8 0. 0.00000 205800. #Fitted_point .00300 3000000 621. 0. .0 205800. #Fitted_point manually .00300 10000000 621. 0. .0 205800. #Fitted_point manually #