Materials and mechanics of rate effects in brittle fracture. Final report

Technical Report · Wed Jul 01 04:00:00 EDT 1981

OSTI ID:6304270

Burns, S J

This document summarizes results of studies on: dynamic analysis of rapidly wedged double cantilevered beam specimens; experimental measurements of stress intensity factors for a propagating brittle crack in steel at selected temperatures; elastic, nonlinear fracture analysis in a thermodynamic formalism using energy balances; mechanical fracture stability for either constant load or constant displacement specimens; measuring J/sub IC/ by recording the load versus the loadpoint displacement for two specimens that have a finite difference in crack area; creep cracking and determination of the activation enthalpy for the rate controlling process in steady-state crack propagation - crack velocity measurements over nine orders of magnitude; experimental determination of the athermal component of the crack driving force establishing its temperature independence; and elastic solutions for a single dislocation and arrays of dislocations at a sharp crack tip, proving crack tip dislocation shielding concept.

• Research Organization: Rochester Univ., NY (USA). Dept. of Mechanical Engineering
• DOE Contract Number: AS02-76ER02422
• OSTI ID: 6304270
• Report Number(s): DOE/ER/02422-29; ON: DE81028489
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000* -- Materials
ALLOYS
BRITTLENESS
CRACK PROPAGATION
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ENERGY BALANCE
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
LINE DEFECTS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
RESEARCH PROGRAMS
SOLIDS
STEELS
STRAIN RATE
STRUCTURAL BEAMS