On Specimen Shape Effects and the Ductility of Porous Metals

Abstract

The influence of specimen shape on the elongation to failure has been simulated for materials containing random distributions of pores or voids. The analysis is performed utilizing a computer simulation in which distributions of pores are modeled in two dimensions as arrays of circular holes with differing hole microstructures . The simulations predict that long, narrow specimens with high aspect ratios should exhibit a loss of ductility which is most pronounced at low area fractions of voids/pores, and when the void/pore distributions exhibit a high degree of clustering. Under these conditions, the ductility data also exhibit considerable scatter. The results, which may be qualitatively understood in terms of imperfection theory, which also contains implications with regard to porosity and fracture toughness at low temperatures.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1989
Accession Number
ADA206216

Entities

People

  • A. Geltmacher
  • Donald A. Koss

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aspect Ratio
  • Classification
  • Computer Simulations
  • Engineering
  • Geometry
  • Low Temperature
  • Materials
  • Materials Science
  • Mechanical Properties
  • Porous Metals
  • Security
  • Simulations
  • Strain Hardening
  • Three Dimensional
  • Toughness
  • Two Dimensional
  • Universities

Fields of Study

  • Materials science

Readers

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