Plastic Envelope in Propagating Crack Wake on Al-Li Alloys Subjected to Fatigue Cycles and to Different Heat Treatments

Abstract

The aim of this research is to study the fracture behavior of three Al-Li alloys (2091-2195-8090), using standard CT specimens, in the frequency range of 1-10 Hz. Each of these three alloys is subjected to different heat treatments and its homogeneity is analyzed, before and after treatments, by Scanning Electron Microscope (SEM). Crack tip opening displacements and plastic zone envelope analyses are fully treated by experimental and numerical results and fatigue crack growth process is extensively reported. At the end of fatigue tests, specimen fracture surfaces have been deeply analyzed by SEM in order to individualize the characteristics of fracture as function of frequency, DELTA KAPPA and load ratio R.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2000
Accession Number
ADP010415

Entities

People

  • M. Marchetti
  • S. Corradi
  • W. Stellino

Organizations

  • Sapienza University of Rome

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Crack Propagation
  • Crack Tips
  • Electron Microscopes
  • Elements
  • Fatigue Tests (Mechanics)
  • Geometry
  • Heat Treatment
  • Lithium Alloys
  • Materials
  • Plastic Deformation
  • Residual Stress
  • Stress Intensity Factors
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Oncology

Technology Areas

  • Microelectronics