Void/Pore Distributions and Ductile Fracture.

Abstract

The effects of void or pore distributions on ductile fracture has been modeled experimentally. Pores or voids are physically modeled in two dimensions by both random and regular arrays of equi-sized holes drilled through the thickness of tensile specimens of 1100-0 Al sheet and 7075-T6 Al plate and sheet. Fracture strains as well as failure paths have been determined for different hole sizes, spacings, and area fractions. A statistical analysis of the data indicates that increasing the minimum hole spacing, which decreases the degree of hole clustering, increases both strength and ductility. Conversely, decreasing the hole size causes a minor increase in both strength and ductility. Increasing the rate of work hardening is beneficial to ductility in that a high strain hardening rate appears to increase the resistance to flow localization between holes. The results are discussed in terms of a fracture process which depends on shear localization between holes/voids and which is very sensitive to void/pore distributions. Keywords: Fracture, Porosity, Voids.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1985
Accession Number
ADA163508

Entities

People

  • Donald A. Koss
  • E. M. Dubensky

Organizations

  • Michigan Technological University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Computer Programs
  • Ductility
  • Engineering
  • Experimental Design
  • Hardening
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Military Research
  • Orientation (Direction)
  • Shear Stresses
  • Statistical Analysis
  • Strain Hardening
  • Tensile Properties
  • Tensile Strength
  • Tensile Testing
  • Yield Strength

Readers

  • Materials Science (Mechanical Engineering).

Technology Areas

  • Space
  • Space - Hall-Effect Thruster