The Theory Relating the Woehler Equation to Cumulative Damage in the Distribution Fatigue Life

Abstract

A theoretical model which is able to encompass the observed fatigue growth phenomena of crack acceleration or crack deceleration, crack arrest, and crack jump at a change of load level, is proposed for the expected incremental crack growth rate under programmed loads. The parameters are calculated by techniques which match the crack growth rate using earlier data on striation counts obtained by electron fractography for an aluminum alloy. The implications of this model for determining an appropriate distribution of fatigue life are noted.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1974
Accession Number
AD0778415

Entities

People

  • Sam C. Saunders

Organizations

  • Washington State University

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Aircrafts
  • Aluminum
  • Aluminum Alloys
  • Commercial Aircraft
  • Crack Tips
  • Deceleration
  • Equations
  • Fracture (Mechanics)
  • Inequalities
  • Materials
  • Measurement
  • Numerical Analysis
  • Random Variables
  • Sequences
  • Steady State

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Microelectronics