EVALUATION OF FRACTURE ENERGY OF ALUMINUM ALLOYS

The fracture toughnesses of some precipitation-hardened aluminum alloys have been evaluated, mainly by the use of precracked three-point bend specimens in instrumented impact testing. A recently developed interpretation of the specific surface energy method has been applied to calculate the initiation values of the critical value of stress intensity factor K sub Ic) and these values have been compared with those calculated using stress analysis equations. The value of unity thereby deduced for the geometrical constraint factor in these non-rate-sensitive materials may be appropriate of the type of fracture mode occurring in these alloys, that is, semiductile. The distinction in principle between fracture initiation toughness, expressed as G sub Ic equals w/eta A, and the average propagation toughness W/A has been noted and the latter used in studying crack tunnelling during semiductile crack propagation in thick sections of the sections of the alloys in the form of large, double-cantilever beam specimens. /AUTHOR/

• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Johnson, F A
  • Radon, J C
• Publication Date: 0

Media Info

• Features: Figures; References;
• Pagination: p. 364-367
• Serial:
  • ASTM Journal of Testing and Evaluation
  • Volume: 3
  • Issue Number: 5
  • Publisher: Federal Highway Administration

Subject/Index Terms

• TRT Terms: Age hardening; Aluminum alloys; Calculation; Cracking; Crash tests; Equations; Evaluation; Fracture mechanics; Geometry; Structural analysis; Toughness
• Uncontrolled Terms: Computation; Crack propagation; Fracture; Fracture energy; Precipitation hardening
• Subject Areas: Geotechnology; Highways; Materials; Research;

Filing Info

• Accession Number: 00126509
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 14 1976 12:00AM