# # Fitted Curve! Both Constant Ampl. and Periodic Overload data ! # SAE8822 simulated Carburized Core 100%Martensite HRc=39 # File contains the Short life from Iter108 plus the long-live POL data from It 112 # Chemical composition is "high side" # Material cyclically softens substantially. See curves. # ElecFurnace, VacuumDegas, LadleRefined, Concast_177mmBillet # HotRolled to 34mm bar. # Process:High Side Composition Quenched and Tempered Simulated # Carburized Core (Atmosphere) # Test: UoWaterloo, M.El-Zeghayar and T.Topper Apr2008 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE8822 #Name= It_108+112 #Stress_units= MPa #Strain_units= strain #Sy= 1135.0 #Su= 1215.0 #E= 194000 #monotonic_K= 1430.0 #monotonic_n= 0.037 #FractureStrain= 0.903 #FractureStress= 2690. #%RA= 59.4 #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 39 #Bhn= 362 #converted #StrAmp 2Nf StsAmp So CalcPlasStr InitialModulus # Long life points have been removed from Const.Ampl file iter 108 # # Periodic Overload test data from iter 112 is below: # SAE8822 AisiIt_108 BHN= 362 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 28137. KSI, 194. GPA K' = 208.3 KSI, 1436.MPA #YIELD,0.2%= 165. KSI, 1135. MPA N' = 0.0938 #ULT. STRG.= 176. KSI, 1215. MPA F. STRG COEF= 218.3 KSI, 1505.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0694 #N = 0.0000 FAT DUCT COEF= 1.6484 #RED. IN AREA = 59.4 F.DUCT EXP, c=-0.7401 #T. FRAC. STG.= 390.2 KSI, 2690. MPA Exp Cyc Yld = 116. Ksi, 802.MPA #T. FRAC. STR.= 0.903 Fit Cyc Yld = 116. Ksi, 800.MPA #No. fatigue data points= 25 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Fitted short life data manually FAC Aug2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .902 1 2690. 0. .888 194000. #Fitted_point manually 0.01052 2000 854.0 0. 0.00612 194000. #Fitted_point 0.00731 5000 820.3 0. 0.00308 194000. #Fitted_point 0.00590 10000 794.8 0. 0.00180 194000. #Fitted_point 0.00498 20000 768.6 0. 0.00102 194000. #Fitted_point 0.00421 50000 731.5 0. 0.00044 194000. #Fitted_point 0.00382 100000 700.1 0. 0.00021 194000. #Fitted_point 0.00352 200000 666.0 0. 0.00009 194000. #Fitted_point 0.00322 500000 619.6 0. 0.00003 194000. #Fitted_point 0.00303 1000000 586.5 0. 0.00001 194000. #Fitted_point 0.00287 2000000 555.9 0. 0.00000 194000. #Fitted_point 0.00268 5000000 519.2 0. 0.00000 194000. #Fitted_point 0.00255 10000000 493.7 0. 0.00000 194000. #Fitted_point 0.00242 20000000 469.8 0. 0.00000 194000. #Fitted_point 0.00227 50000000 440.3 0. 0.00000 194000. #Fitted_point 0.00216 100000000 419.4 0. 0.00000 194000. #Fitted_point 0.00206 200000000 399.6 0. 0.00000 194000. #Fitted_point 0.00193 500000000 374.9 0. 0.00000 194000. #Fitted_point 0.00184 1000000000 357.2 0. 0.00000 194000. #Fitted_point # #