MONITORING CRACK EXTENSION IN FRACTURE TOUGHNESS TESTS BY ULTRASONICS

An ultrasonic method was used to observe the onset of crack extension and to monitor continued crack growth in fracture toughness specimens during three-point bend tests. A 20-MHz tranducer was used with commercially available equipment to detect average crack extension less than 0.09 mm. The material tested was a 300-grade maraging steel in the annealed condition. A crack extension resistance curve was developed to demonstrate the usefulness of the ultrasonic method for minimizing the number of tests required to generate such curves.

• 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:
  • Klima, S J
  • Fisher, D M
  • Buzzard
• Publication Date: 1976-11

Media Info

• Features: Figures; References;
• Pagination: p. 397-404
• Serial:
  • ASTM Journal of Testing and Evaluation
  • Volume: 4
  • Issue Number: 6
  • Publisher: Federal Highway Administration

Subject/Index Terms

• TRT Terms: Bend tests; Cracking; Fracture mechanics; Monitoring; Toughness; Ultrasonics
• Uncontrolled Terms: Crack propagation; Fracture
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00148424
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 15 1977 12:00AM