Accession Number : AD0684137

Title :   THEORETICAL MODEL OF DUCTILE FRACTURE INSTABILITY BASED ON STRESS-WAVE EMISSION.

Descriptive Note : Final rept.,

Corporate Author : AEROJET-GENERAL CORP SACRAMENTO CALIF

Personal Author(s) : Gerberich,W. W. ; Reuter,W. G.

Report Date : FEB 1969

Pagination or Media Count : 59

Abstract : The report discusses a postulated, very general interpretation of fracture in terms of how dislocation mobility affects the local fracture stress. However, it is difficult to correlate this concept directly to the slow crack growth process which occurs in many complex materials. Also, there has been little experimental evidence of dislocation dynamics and discontinuous crack motion in complex materials which would allow such a model to be established. This program was initiated to study these characteristics in an effort to establish such a fracture criterion. (Author)

Descriptors :   (*ALUMINUM ALLOYS, FRACTURE(MECHANICS)), (*FRACTURE(MECHANICS), THEORY), DISLOCATIONS, LOADS(FORCES), STRAIN GAGES, CRACK PROPAGATION, TRANSDUCERS, INSTRUMENTATION, COLD WORKING, STRESSES, TENSILE PROPERTIES, ACOUSTIC PROPERTIES, MECHANICAL WAVES, CALIBRATION, AGING(MATERIALS), SOLID SOLUTIONS, SOLUTION HEAT TREATMENT

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE