FRACTURE TOUGHNESS AND ABSORBED ENERGY MEASUREMENTS IN IMPACT TESTS ON BRITTLE MATERIALS

Previous work on impact testing has shown that the energy/unit area (w) normally measured in notched impact tests is dependent on specimen geometry. A fracture mechanical analysis has now been developed to account for the observed dependence of w on notch size. A correction factor has been derived to accommodate notch effects and this allows for the calculation of the strain energy release-rate G directly from the measured fracture energies. The experimental results on polymethyl methacrylate show that there is an additional energy term which must be accounted for and this has been interpreted as being due to kinetic energy losses in the specimens. A conservation of momentum analysis has allowed a realistic correction term to be calculated to include kinetic energy effects and the normalized experimental results show complete consistency between all the geometries used in the test series. It is concluded that the analysis resolves many of the difficulties associated with notched impact testing and provides for the calculation of realistic fracture toughness parameters.

• Corporate Authors:

  Chapman and Hall Limited

  11 New Fetter Lane
  London,   England 
• Authors:
  • Marshall, G P
  • Williams, J G
  • Turner, C E
• Publication Date: 1973-7

Media Info

• Features: References;
• Pagination: p. 949-956
• Serial:
  • Journal of Materials Science
  • Volume: 9
  • Issue Number: 7
  • Publisher: Chapman and Hall Limited

Subject/Index Terms

• TRT Terms: Fracture mechanics; Fracture properties; Notch tests
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00051092
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Feb 28 1974 12:00AM