# # Fitted Curve. Check long life fit. # AISI 4130 ALLOYsteel, SteelHeatTreated # 1700F 1/2hr in salt, water Q, Tempered at 1200F 1/2hr in salt, air cool. # Diametral (hourglass) specimens Longitudinal to wrought bar stock. # SMITH ET AL, NASA TN D-1574, APRIL 63, BHN 253/265 # saedigcurve_v2.2.f starts. # All of the data below was derived, but not copied, from the NASA Tech. # Note D-1574.The derivations and additions have been made by the members # of the FD+E committee of the SAE. Thus: # # Copyright (C) 1999 Fatigue Design + Evaluation Committee of the SAE. # 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 MERCHANTA- # BILITY 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 # #Fn= 91 # #FileType= strain_life #DataType= fitted #TIMEcol= 0 #NAME= SAE4130_Steel #Stress_units= ksi #Strain_units= strain #Su= 129.90 #Sy= 112.90 #E= 31981. #%RA= 67.3 #BHN= 259. #NO. FAT. PTS.= 21 # SAE4130_St BHN= 259 Fn= 91 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 31981. KSI, 221. GPA K' = 183.3 KSI, 1264.MPA #YIELD,0.2%= 113. KSI, 778. MPA N' = 0.1186 #ULT. STRG.= 130. KSI, 896. MPA F. STRG COEF= 182.9 KSI, 1261.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0768 #N = 0.0000 FAT DUCT COEF= 0.9849 #RED. IN AREA = 67.3 F.DUCT EXP, c=-0.6479 #T. FRAC. STG.= 0.0 KSI, 0. MPA Exp Cyc Yld = 88. Ksi, 605.MPA #T. FRAC. STR.= 0.000 Fit Cyc Yld = 84. Ksi, 577.MPA #No. fatigue data points= 21 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' #Stress_Units= KSI # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 0.99060 1 197.6 0. 0.98442 31981. #Fitted_point 0.63397 2 185.7 0. 0.62817 31981. #Fitted_point 0.35219 5 171.0 0. 0.34685 31981. #Fitted_point 0.22634 10 160.7 0. 0.22131 31981. #Fitted_point 0.14593 20 151.0 0. 0.14121 31981. #Fitted_point 0.08232 50 139.0 0. 0.07798 31981. #Fitted_point 0.05385 100 130.6 0. 0.04977 31981. #Fitted_point 0.03561 200 122.7 0. 0.03177 31981. #Fitted_point 0.02111 500 113.1 0. 0.01758 31981. #Fitted_point 0.01457 1000 106.3 0. 0.01125 31981. #Fitted_point 0.01034 2000 99.9 0. 0.00722 31981. #Fitted_point 0.00692 5000 92.2 0. 0.00404 31981. #Fitted_point 0.00534 10000 86.8 0. 0.00262 31981. #Fitted_point 0.00428 20000 81.9 0. 0.00172 31981. #Fitted_point 0.00338 50000 76.0 0. 0.00100 31981. #Fitted_point 0.00293 100000 72.0 0. 0.00068 31981. #Fitted_point 0.00260 200000 68.3 0. 0.00047 31981. #Fitted_point 0.00229 500000 63.9 0. 0.00029 31981. #Fitted_point 0.00211 1000000 60.9 0. 0.00020 31981. #Fitted_point 0.00196 2000000 58.0 0. 0.00014 31981. #Fitted_point 0.00179 5000000 54.5 0. 0.00009 31981. #Fitted_point 0.00169 10000000 51.9 0. 0.00006 31981. #Fitted_point 0.00159 20000000 49.4 0. 0.00005 31981. #Fitted_point 0.00148 50000000 46.3 0. 0.00003 31981. #Fitted_point 0.00140 100000000 44.0 0. 0.00002 31981. #Fitted_point 0.00132 200000000 41.8 0. 0.00001 31981. #Fitted_point 0.00123 500000000 39.1 0. 0.00001 31981. #Fitted_point 0.00117 1000000000 37.1 0. 0.00001 31981. #Fitted_point #