The Influence of Porosity on Short Fatigue Crack Growth at Large Strain Amplitudes

Abstract

The influence of the pore microstructure (0% to 6%) rounded porosity isolated vs. interconnected)on short crack growth behavior during low cycle fatigue has been evaluated using powder-processed titanium as a model system. The presence of porosity enhances short crack propagation adjacent to the pores as a result of localized, pore-induced plasticity. Observations of short cracks using surface replicas indicate that once a crack extends beyond a plastic zone of an isolated pore, it decelerates to propagation rates similar to those observed for fully dense materials of the similar grain sizes.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA198477

Entities

People

  • D. A. Gerard
  • Donald A. Koss

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aspect Ratio
  • Chemistry
  • Crack Propagation
  • Diameters
  • Engineering
  • Fatigue Life
  • Fracture (Mechanics)
  • Grain Size
  • J Integrals
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanics
  • Metallurgy
  • Metals
  • Porous Materials

Readers

  • Materials Science (Mechanical Engineering).
  • Mathematics or Statistics