# #Copyright (C) 2011 Fatigue Design and Evaluation Comm. #This data file is free software - you can redistribute it and/or #modify it under the terms of the GNU General Public License as #published by the Free Software Foundation; either version 2 of the #license, or (at your option) any later version. #This data file is distributed in the hope that it will be useful, #but WITHOUT ANY WARRANTY - without even the implied warranty of #MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #GNU General PUblic License for more details. #You should have received a copy of the GNU General PUblic License #along with this program - if not, write to the Free Software #Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA #Try also their web site: http://www.gnu.org/copyleft/gpl.html # # Note: Fitted Data !! # SAE 1018 Normalized, Longitudinal Specimens. Tested in Air. # Specimens machined from 3.5 inch normalized forged billet. # 0.18C wt% .006P .028S .50Mn .04Si .036Cu .036Cr .008Sn .025Ni .01Mo .03Co # Hardnes Rb= 48.5, Vickes(30kg)= 101 # Sources: The data points were derived from graphs in the paper: # D.G.Havard and T.H.Topper, "Low-Cycle Biaxial Fatigue of AISI 1018 Steel," # Ontario Hydro Res. Quaterly, 2nd Q. 1969, pp.1-12. # Note: Data may contain errors from digitization process. # Note: there are no test data points beyond 2Nf=1 million. # #FileType= strain_life #DataType= fitted #TIMEcol= 0 #NAME= SAE1018steel #NAME= Normalized #NAME= test_in_air #Name= Longitudinal #Stress_units= mpa #Strain_units= strain #Su= 422. mpa #Sy= 200. mpa #E= 206700. #Modulus not reported. Assumed=30000ksi #FractureStrain= 0.968 #FractureStress= 1102. #BHN= 82 HV-30kg= 101, HRb=48.5 #%RA= 61.8 #Elongation= 54.2 (3/8 inch G.L.) # saedigcurve_v2.2.f starts. # # 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. 0.963 1 1102 0 .926 206700. #Fitted_point tensile fracture 0.04817 100 564.1 0. 0.04544 206700. #Fitted_point 0.03320 200 505.1 0. 0.03075 206700. #Fitted_point 0.02046 500 436.4 0. 0.01835 206700. #Fitted_point 0.01431 1000 390.8 0. 0.01242 206700. #Fitted_point 0.01010 2000 349.9 0. 0.00840 206700. #Fitted_point 0.00648 5000 302.3 0. 0.00501 206700. #Fitted_point 0.00470 10000 270.6 0. 0.00339 206700. #Fitted_point 0.00347 20000 242.3 0. 0.00229 206700. #Fitted_point 0.00238 50000 209.2 0. 0.00137 206700. #Fitted_point 0.00183 100000 187.3 0. 0.00092 206700. #Fitted_point 0.00143 200000 167.6 0. 0.00062 206700. #Fitted_point 0.00107 500000 144.6 0. 0.00037 206700. #Fitted_point 0.00088 1000000 129.3 0. 0.00025 206700. #Fitted_point 0.00073 2000000 115.6 0. 0.00017 206700. #Fitted_point #