Study of Probabilistic Fatigue Crack Growth and Associated Scatter Under Constant-and-Variable Amplitude Loading Spectrum

Abstract

The objective of the program's second year research work was to examine the validity of the constant probability crack growth model while refining the transition intensity parameter. This work has been completed, thus leading to a crack growth rate equation with an explicit probability term. Furthermore, work extending the applicability of the model to variable loading required the determination of the delay-time associated with a single overload. An experimental test program was carried out on a titanium alloy using a potential drop technique to record crack length increments as function of overload characteristics. This program has been completed and results will be incorporated into the basic stochastic model.

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Document Details

Document Type
Technical Report
Publication Date
Sep 06, 1987
Accession Number
ADA192027

Entities

People

  • Hamouda Ghonem

Organizations

  • University of Rhode Island

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Applied Mechanics
  • Crack Propagation
  • Crack Tips
  • Engineering
  • Equations
  • Experimental Data
  • Mathematical Models
  • Mechanical Engineering
  • Mechanics
  • Probabilistic Models
  • Probability
  • Random Variables
  • Stochastic Processes

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Materials Science (Mechanical Engineering).
  • Software Engineering