Influence of Microstructure and Microdamage Processes on Fracture at High Loading Rates.

Abstract

The optimal use of advanced beta and near-beta titanium alloys in situations involving dynamic or shock loading requires an understanding of the influence of microstructure and loading rate on fracture behavior. To address this need, SRI is performing dynamic crack initiation and propagation experiments on Ti-1OV-2Fe-3Al in three microstructural conditions, varying the loading rate to establish the rate-dependence of the fracture toughness. A new experimental method developed in a previous Air Force Office of Scientific Research program (the one point bend impact test) and numerical simulations of the experiments are used to determine dynamic initiation and propagation toughness. Further, the fracture surface topography analysis (FRASTA) technique is applied to the fractured specimens to elucidate the microstructural failure mechanisms controlling fracture in each of the investigated microstructures. Keywords: Microstructure, Dynamic fracture, Initiation toughness, Propagation toughness, Titanium alloys, Iron alloys, Aluminum alloys.

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Document Details

Document Type
Technical Report
Publication Date
Mar 03, 1988
Accession Number
ADA192957

Entities

People

  • D. A. Shockey
  • J. H. Giovanola

Organizations

  • SRI International

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Air Force
  • Air Force Facilities
  • Alloys
  • Engineering
  • Failure Mode And Effect Analysis
  • Fracture (Mechanics)
  • Impact Loads
  • Impact Tests
  • Materials
  • Materials Science
  • Mechanics
  • Metals
  • Scientific Research
  • Shock
  • Strain Rate
  • Titanium Alloys

Readers

  • Computational Fluid Dynamics (CFD)
  • Materials Science (Mechanical Engineering).