Experimental Random Fatigue in Elastic-Plastic Range - Models of Significant Variables.

Abstract

In the previous study of first order models with 11 variables to predict fatigue life of materials in elastic-plastic range under random vibrations, 5 variables showed significant effects. In this report both first and second order models based on 5 significant variables have been developed. The tables of analysis of variance, and of the predicted lives together with residuals and 95% confidence intervals, are constructed for each model. Based on 24 tests a second order model of 5 significant variables consisting of 10 terms is found to be the best one. The deviations of the lives predicted by this model ranged from -34.3% to 17.4% with an average of 8.32% on the negative side and 6.35% on the positive side. These results contrast with those which are obtained by the principle of linear damage accumulation and cycle counting and involve several hundred percent error as a rule. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1979
Accession Number
ADA090495

Entities

People

  • Tao Huang
  • Vinod K. Nagpal

Organizations

  • University of Wisconsin–Madison

Tags

DTIC Thesaurus Topics

  • Analysis Of Variance
  • Composite Materials
  • Data Science
  • Engineering
  • Equations
  • Factorial Design
  • Fatigue Life
  • Information Science
  • Intervals
  • Materials
  • Materials Testing
  • Mechanics
  • Military Research
  • Plastic Explosives
  • Random Vibration
  • Residuals
  • Universities

Readers

  • Statistical inference.
  • Structural Health Monitoring of Composite Structures.