Dynamic Fracture Toughness Evaluation by Measurement of CTOD (Crack Tip Opening Displacement).

Abstract

Quantification of the dynamic fracture toughness of structural materials is essential to a wide range of problems - from nuclear accidents to ordnance applications. However, the difficulties associated with accurate measurements of cracks under dynamic loading are considerable. Thus there are no standardized procedures and few reliable results. This work describes a systematic study of the dynamic fracture toughness of SAE-01 tool steel, 4340 and HY100 steels and a tungsten, using the ISDG (Interferometric Strain/Displacement Gage) system which has very high frequency resolution. The major advantage of the method is that information is obtained very close to the crack tip, so that stress wave loading effects are accounted for. A detailed error analysis gives an uncertainty of -10% to +20% in the determination of fracture toughness, which compares with + or - 20% for published work.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 15, 1988
Accession Number
ADA194836

Entities

People

  • Andrew S. Douglas
  • Jason M. Shapiro
  • William N. Sharpe Jr.

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Computational Science
  • Dynamic Tests
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Impact Tests
  • J Integrals
  • Load Cells
  • Measurement
  • Mechanical Engineering
  • Mechanics
  • Military Research
  • Static Tests
  • Stress Strain Relations
  • Test And Evaluation
  • Test Methods
  • Three Dimensional
  • Two Dimensional

Readers

  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design