# 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 # 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 #--------------------------------------------------------------------------- # Example of a dataset that is difficult to fit using the "Strain-Life" Approach. # # STAINLESS STEEL, HOT ROLLED AND ANNEALED, LONGITUDINAL # SMITH ET AL, NASA TN D-1574, 63, BHN 153/160 # File is fitted by hand. Mar3 2009 FAC #FileType= strain_life #DataType= fitted #TIMEcol= 0 #NAME= AISI_304soft #Stress_units= ksi #Strain_units= strain #Su= 108. #Sy= 37.01 #E= 27000. #%RA= 74. #BHN= 154. #NO. FAT. PTS.= 13 # #These are the regular least sq fits (not used) ## Monotonic Props. Cyclic Props. #ELAS. MOD.= 27000. KSI, 186. GPA K' = 774.2 KSI, 5338.MPA #YIELD,0.2%= 37. KSI, 255. MPA N' = 0.3794 #ULT. STRG.= 108. KSI, 745. MPA F. STRG COEF= 323.8 KSI, 2232.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.1433 #N = 0.0000 FAT DUCT COEF= 0.1005 #RED. IN AREA = 74.0 F.DUCT EXP, c=-0.3777 #T. FRAC. STG.= 0.0 KSI, 0. MPA Exp Cyc Yld = 73. Ksi, 505.MPA #T. FRAC. STR.= 0.000 Fit Cyc Yld = 75. Ksi, 515.MPA #No. fatigue data points= 13 # ##NOTE!! The Following Points are <b>FITTED DATA:</b> #Stress_Units= KSI ##Total Strain 2Nf Stress Mean Plastic Strain Initial ## Amp Amp Stress Amp Elastic Mod. 0.45 1 270. 0. 0.44 27000. #Fitted_point 0.050 55 180. 0. 0.0436 27000. #Fitted_point 0.0092 1000 127. 0. 0.00740 27000. #Fitted_point 0.0070 2000 116. 0. 0.0030 27000. #Fitted_point 0.0058 5000 99.9 0. 0.00185 27000. #Fitted_point 0.0050 10000 86.4 0. 0.0017 27000. #Fitted_point 0.0035 85000 58.7 0. 0.0013 27000. #Fitted_point 0.0030 320000 50. 0. 0.00115 27000. #Fitted_point 0.0026 2000000 43.7 0. 0.0009 27000. #Fitted_point 0.0018 100000000 30. 0. 0.0006 27000. #Fitted_point #