Fracture Toughness Measurements of Two Specimen Geometries Considering Stability in Brittle Materials.

Abstract

It has been shown that a lack of stable crack extension can influence the critical stress intensity factor (SIF) measured for brittle materials. Previously performed stability analyses of two specimen geometries were used to design experiments, which would make it possible to observe the transition from unstable to stable fracture as a function of the specimen compliance. This transition was observed to be in agreement with the predictions. The lack of stability gave higher critical SIF values for the material with the higher fracture toughness, while this difference was lost in the experimental scatter for the other materials.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1996
Accession Number
ADA314124

Entities

People

  • Francis I. Baratta
  • Kyu C. Cho

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Ceramic Materials
  • Geometry
  • Grain Size
  • Intensity
  • Load Cells
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Military Research
  • Physical Properties
  • Stress Intensity Factors
  • Stresses
  • Technical Ceramics
  • Three Dimensional
  • Toughness

Readers

  • Aerospace Test and Evaluation
  • Fluid Mechanics and Fluid Dynamics.
  • Metallurgy