Advanced Cumulative Damage Modeling

Abstract

Crack growth in the near-threshold and Paris regimes (Regions I and II), were measured in single edge notch specimens of Rene 95 and Alloy 718 as a function of test temperature, R-ratio, hold time, frequency, and overpeak ratio. The results obtained at 649 deg. C were modeled using an interpolation and interpolation + superposition model. Both models accurately predicted the time dependent crack growth of these materials. The interpolation + superposition model appeared to be a better model because the interpolation model made unrealistic predictions outside the range of data obtained in this investigation. The overpeak retardation was predicted using a modified Willenborg model. A residual life computer code (ACDCYCLE), which can be run on an IBM personal computer, was written to make predictions of crack growth rates and residual lives. Metal fatigue; Metal life prediction; Time-dependent; Metal cracks; Fatigue; Metal crack growth; Cycle-dependent metal fatigue; Interpolative model; Metal fracture mechanics; Superposition model.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1988
Accession Number
ADA218555

Entities

People

  • D. D. Krueger
  • O. C. Gooden
  • R. H. Vanstone

Organizations

  • GE Aerospace

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Computer Programs
  • Databases
  • Fracture (Mechanics)
  • Literature Surveys
  • Materials
  • Materials Laboratories
  • Materials Testing
  • Measurement
  • Mechanical Working
  • Mechanics
  • Personal Computers
  • Plastic Explosives
  • Regression Analysis
  • Statistical Analysis
  • Tensile Strength
  • Test And Evaluation
  • Test Methods

Readers

  • Computational Modeling and Simulation
  • Materials Science (Mechanical Engineering).