Effect of Grain Size on Quasistatic and Dynamic Fracture of Titanium

Abstract

The feasibility of establishing quantitative relationships between microstructural features and dynamic fracture behavior was investigated by performing plate impact experiments on specimens of alpha titanium differing predominantly in grain size, and determining values of parameters describing microfracture nucleation and growth. The dynamic fracture strengths for materials having average grain diameters of 36 micro m and 1.5 micro m were essentially identical, but threshold nucleation rates, nucleation stress sensitivities, and microfracture growth viscosities differed by factors of 2 to 3. The coarse-grained material exhibited superior dynamic fracture resistance even though its quasi-static yield and ultimate tensile strengths were significantly lower than those of the fine-grained material. An explanation for this reversal in behavior is given in terms of the microstructure and the microfracture kinetics.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1978
Accession Number
ADA057373

Entities

People

  • D. A. Shockey
  • K. C. Dao
  • R. L. Jones

Organizations

  • SRI International

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Damage Assessment
  • Fabrication
  • Fine Grained Materials
  • Grain Boundaries
  • Grain Growth
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Microscopes
  • Phase Diagrams
  • Plastic Explosives
  • Stresses
  • Tensile Properties
  • Tensile Strength
  • Tensile Stress

Fields of Study

  • Materials science

Readers

  • Aerosol Science/Aerosol Physics
  • Computational Modeling and Simulation
  • Metallurgy