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Fatigue strength reduction model: RANDOM3 and RANDOM4 user manual, appendix 2The FORTRAN programs RANDOM3 and RANDOM4 are documented. They are based on fatigue strength reduction, using a probabilistic constitutive model. They predict the random lifetime of an engine component to reach a given fatigue strength. Included in this user manual are details regarding the theoretical backgrounds of RANDOM3 and RANDOM4. Appendix A gives information on the physical quantities, their symbols, FORTRAN names, and both SI and U.S. Customary units. Appendix B and C include photocopies of the actual computer printout corresponding to the sample problems. Appendices D and E detail the IMSL, Version 10(1), subroutines and functions called by RANDOM3 and RANDOM4 and SAS/GRAPH(2) programs that can be used to plot both the probability density functions (p.d.f.) and the cumulative distribution functions (c.d.f.).
Document ID
19890014520
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Boyce, Lola (Texas Univ. San Antonio, TX, United States)
Lovelace, Thomas B. (Texas Univ. San Antonio, TX, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1989
Subject Category
Structural Mechanics
Report/Patent Number
NASA-CR-184940
NAS 1.26:184940
Accession Number
89N23891
Funding Number(s)
CONTRACT_GRANT: NAG3-867
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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