MEASUREMENT OF FRACTURE TOUGHNESS BY INSTRUMENTED IMPACT TEST

Previous studies of the Charpy impact test using instrumented pendulum or anvil with V-notch steel specimens are reviewed. It is concluded that such results add little to the usefulness of the test since even cleavage fractures are normally well beyond yield. No fracture toughness index emerges other than the simple measure of energy from the pendulum. In a second generation of work, fatigue cracked and side grooved (fcsg) specimens promoted below yield fractures up to about the 50 percent fracture appearance transition temperature (fatt). These results have been analysed by linear fracture mechanics to give the dynamic fracture toughness K sub ID. In this interpretation understanding of the oscillations in load records due to specimen vibration is important. Results are discussed in the light of recent studies including an analog model with which near quantitative agreement is found. An improved simple correction factor for inertia loading effects is presented.

• 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:
  • Turner, C E
• Publication Date: 1970-3

Media Info

• Features: References;
• Pagination: p. 93-114
• Serial:
  • Impact Testing of Metals
  • Publisher: American Society for Testing and Materials (ASTM)

Subject/Index Terms

• TRT Terms: Crash tests; Fatigue tests; Fracture mechanics; Fracture properties; Inertia (Mechanics); Inertial forces; Notch tests
• Subject Areas: Marine Transportation; Materials; Research;

Filing Info

• Accession Number: 00019185
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: Spec Tech Publ 466
• Files: TRIS
• Created Date: Nov 8 1971 12:00AM