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  • 1
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    Fatigue strength reduction model: RANDOM3 and RANDOM4 user manual. Appendix 2: Development of advanced methodologies for probabilistic constitutive relationships of material strength models (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: FORTRAN programs RANDOM3 and RANDOM4 are documented in the form of a user's manual. Both programs are based on fatigue strength reduction, using a probabilistic constitutive model. The programs predict the random lifetime of an engine component to reach a given fatigue strength. The theoretical backgrounds, input data instructions, and sample problems illustrating the use of the programs are included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184796-APP-2 , NAS 1.26:184796-APP-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Fatigue strength reduction model: RANDOM3 and RANDOM4 user manual, appendix 2 (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The 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.).
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184940 , NAS 1.26:184940
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Fatigue crack growth model RANDOM2 user manual, appendix 1 (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The FORTRAN program RANDOM2 is documented. RANDOM2 is based on fracture mechanics using a probabilistic fatigue crack growth model. It predicts the random lifetime of an engine component to reach a given crack size. Included in this user manual are details regarding the theoretical background of RANDOM2, input data, instructions and a sample problem illustrating the use of RANDOM2. Appendix A gives information on the physical quantities, their symbols, FORTRAN names, and both SI and U.S. Customary units. Appendix B includes photocopies of the actual computer printout corresponding to the sample problem. Appendices C and D detail the IMSL, Ver. 10(1), subroutines and functions called by RANDOM2 and a SAS/GRAPH(2) program that can be used to plot both the probability density function (p.d.f.) and the cumulative distribution function (c.d.f.).
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184939 , NAS 1.26:184939
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Fatigue crack growth model RANDOM2 user manual. Appendix 1: Development of advanced methodologies for probabilistic constitutive relationships of material strength models (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: FORTRAN program RANDOM2 is presented in the form of a user's manual. RANDOM2 is based on fracture mechanics using a probabilistic fatigue crack growth model. It predicts the random lifetime of an engine component to reach a given crack size. Details of the theoretical background, input data instructions, and a sample problem illustrating the use of the program are included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184775-APP-1 , NAS 1.26:184775-APP-1
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 5
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    Probabilistic lifetime strength of aerospace materials via computational simulation (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The results of a second year effort of a research program are presented. The research included development of methodology that provides probabilistic lifetime strength of aerospace materials via computational simulation. A probabilistic phenomenological constitutive relationship, in the form of a randomized multifactor interaction equation, is postulated for strength degradation of structural components of aerospace propulsion systems subjected to a number of effects of primitive variables. These primitive variables often originate in the environment and may include stress from loading, temperature, chemical, or radiation attack. This multifactor interaction constitutive equation is included in the computer program, PROMISS. Also included in the research is the development of methodology to calibrate the constitutive equation using actual experimental materials data together with the multiple linear regression of that data.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-187178 , NAS 1.26:187178
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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