An Interpolative Model for Elevated Temperature Fatigue Crack Propagation

Abstract

A flexible alternative to the familiar Paris equation has been developed for the interpolative analysis of elevated temperature fatigue crack propagation data. The model is based on the hyperbolic sine equation, log(da/ dn) = C1 sinh (C2(log (delta K) + C3)) + C4, and the coefficients are shown to be simple functions of test frequency, stress ratio, and temperature. This methodology has been successfully used to describe crack propagation characteristics of selected nickel-base, titanium, and steel alloys.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA038070

Entities

People

  • C. G. Annis Jr.
  • D. L. Sims
  • R. M. Wallace

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Alloys
  • Boundaries
  • Cartesian Coordinates
  • Crack Propagation
  • Engines
  • Fracture (Mechanics)
  • Gas Turbines
  • Grain Boundaries
  • Heat Of Activation
  • Materials
  • Materials Laboratories
  • Mechanical Properties
  • Mechanics
  • Turbines
  • Turbofan Engines

Readers

  • Approximation Theory.
  • Computational Modeling and Simulation
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Fully Networked C3