# #Copyright (C) 2011 F.D.E. Committee #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 !! # SAE4340 HeatTreated Q+T Su=1172mpa=170ksi # NOTE!! : PERIODIC OVERLOAD test data. See list below. # Do not use to predict constant amplitude tests. # Specimen 0.25in diam X 0.65in straight section, Quench + Tempered same as Endo/Morrow. # Ref.: N.E. Dowling, "Fatigue Life and Inelastic Strain Response Under Complex # Histories for an Alloy Steel," T.A.M. Report 354, U.of Illinois, April 1972. # Also see: N.E.Dowling, "Fatigue Life and Inelastic Strain Response under Complex # Histories for an Alloy Steel," ASTM J.Test. and Eval., V1 N4 Jul 1973 pp.271-287 # Note: Original Test data digitized from graphs # #FileType= strain_life #DataType= fitted #TIMEcol= 0 #NAME= SAE4340 #NAME= HeatTreated #NAME= Steel #Stress_units= mpa #Strain_units= strain #Sy= 1103. 0.2pc offset #Su= 1172. #eu= 0 #strain at Su not reported #E= 205300. #FractureStrain= 0.82 #computed from %RA #FractureStress= 1634. #BHN= 0. # not reported #%RA= 56 % # 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. 0.82 1 1634. 0. 0.812 205300. #Fitted_point monotonic 0.02124 500 947.2 0. 0.01663 205300. #Fitted_point 0.01416 1000 887.1 0. 0.00984 205300. #Fitted_point 0.00986 2000 830.7 0. 0.00582 205300. #Fitted_point 0.00660 5000 761.4 0. 0.00289 205300. #Fitted_point 0.00517 10000 712.4 0. 0.00170 205300. #Fitted_point 0.00424 20000 666.2 0. 0.00099 205300. #Fitted_point 0.00345 50000 608.7 0. 0.00048 205300. #Fitted_point 0.00304 100000 567.8 0. 0.00028 205300. #Fitted_point 0.00274 200000 529.2 0. 0.00016 205300. #Fitted_point 0.00242 500000 481.9 0. 0.00007 205300. #Fitted_point 0.00223 1000000 448.8 0. 0.00004 205300. #Fitted_point 0.00206 2000000 418.1 0. 0.00002 205300. #Fitted_point 0.00187 5000000 380.9 0. 0.00001 205300. #Fitted_point 0.00174 10000000 355.0 0. 0.00001 205300. #Fitted_point #Points below are all extrapolated (beyond test data) 0.00162 20000000 330.9 0. 0.00000 205300. #Fitted_point 0.00147 50000000 301.7 0. 0.00000 205300. #Fitted_point 0.00137 100000000 281.3 0. 0.00000 205300. #Fitted_point 0.00128 200000000 262.4 0. 0.00000 205300. #Fitted_point 0.00117 500000000 239.3 0. 0.00000 205300. #Fitted_point 0.00109 1000000000 223.1 0. 0.00000 205300. #Fitted_point #