# #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 !! # SAE 4340 HeatTreated Steel Su=785mpa, Specimens cut from 7.5in. diam. Forged # bar in longt. dir., Austenitized at 1560F held for 3 hrs, Oil Quenched., # Temper at 1225F 8 hrs, air cooled.Heat 61738 Viking. # Some specimens tested in Stroke control while monitored strain and load. # Ref.: N.E. Dowling, private communication. # See also: N.E.Dowling, "Notched Member Fatigue Life Prediction Combining # Crack Initiation and Propagation," Fatigue of Engineering Materials and # Structures, V2, N2, 1979, pp.129-138. # N.E. Dowling, "Fatigue at Notches and the Local Strain and Fracture # Mechanics Approaches,"ASTM STP 677, pp. 247-273, 1979. # #FileType= strain_life #DataType= fitted #TIMEcol= 0 #NAME= SAE4340 #NAME= HeatTreated #NAME= Steel #Stress_units= mpa #Strain_units= strain #Sy= 648. 0.2pc offset #Su= 785. #eu= 0 #strain at Su not reported #E= 206700. #FractureStrain= 1.14 #computed from %RA #FractureStress= 1550. #BHN= 193. #%RA= 68 % #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. 1.14 1 1550. 0. 1.09 206700. #Fitted_point monotonic fracture 0.03816 200 690.3 0. 0.03482 206700. #Fitted_point 0.02183 500 643.1 0. 0.01872 206700. #Fitted_point 0.01467 1000 609.6 0. 0.01172 206700. #Fitted_point 0.01014 2000 578.0 0. 0.00734 206700. #Fitted_point 0.00657 5000 538.8 0. 0.00397 206700. #Fitted_point 0.00498 10000 511.2 0. 0.00250 206700. #Fitted_point 0.00394 20000 485.4 0. 0.00159 206700. #Fitted_point 0.00308 50000 454.0 0. 0.00088 206700. #Fitted_point 0.00267 100000 432.3 0. 0.00058 206700. #Fitted_point 0.00237 200000 412.3 0. 0.00038 206700. #Fitted_point 0.00210 500000 388.2 0. 0.00022 206700. #Fitted_point 0.00195 1000000 371.4 0. 0.00015 206700. #Fitted_point 0.00182 2000000 355.6 0. 0.00010 206700. #Fitted_point last pt near testdat 0.00169 5000000 335.9 0. 0.00006 206700. #Fitted_point extrapolated # #