Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Relationship between fracture toughness and acoustic emission during cleavage failure in adhesive joints

  • 120 Accesses

  • 9 Citations

Summary

Fracture toughness in mode I was determined for wood bonded with various adhesive systems. Tapered double-cantilever beam (TDCB) specimens were used, with attached transducer connected to instrumentation for monitoring acoustic emission. Adhesives used fro bonding the TDCB specimens included urea-formaldehyde resin, phenol-resorcinol resin, and emulsion polymer isocyanate, among others. Test parameters measured included critical load for cleavage fracture and number of events (stress waves) emitted, from which fracture toughness and cumulative count of acoustic emission were computed. It was found that there was a well defined, linear relation between fracture toughness and cumulative counts of acoustic emission per fracture area. The fracture toughness values of systems containing polyvinyl acetate and of epoxy resin were larger than those of thermosetting resins such as urea-or phenol formaldehyde. The high fracture toughness imparted by polyvinyl acetate was attributed to viscous movement of linear molecular chain segments, as compared with the more brittle behavior of the crosslinked molecular structure of such resins as ureaformaldehyde.

This is a preview of subscription content, log in to check access.

References

  1. Ebewele, R.; River, B.; Koutsky, J. 1979: Tapered double, cantilever beam fracture test of phenolic-wood adhesive joints. Wood a. Fiber 11: 197–213

  2. Hartbower, C. E.; Reuter, W. G.; Morais, C. F.; Crimmins, P. P., 1972: Use of acoustic emission for the detection of weld and stress corrosion cracking. ASTM Spec. Tech. Pub. 505: 187–249

  3. Ono, K. 1973: Present studies on acoustic emission for iron and steel. Iron and Steel 59: 1338–1359

  4. Onogami, M.; Yamaguchi, K.; Nakasa, H.; Sano, K.; Isono, E.; Watanabe, T. 1979: Acoustic emission-bases and applications. Japan Corona Pub. Co. p. 125

  5. Ripling, E. J.; Mostovoy, S.; Corten, H. T. 1971: Fracture mechanics: a tool for evaluating structural adhesives. J. Adhesion 3: 107–123

  6. Sasaki, H.; Walsh, P. F. 1977: Cleavage fracture toughness of wood-epoxy resin bond system. J. Soc. Mater. Sci. Japan 26: 453–459

  7. Suzuki, M.; Schniewind, A. P. 1984: Fracture toughness of wood-adhesives joints by a tapered double cantilever beam. J. Japan Wood Res. Soc. 30: 60–67

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Suzuki, M., Schniewind, A.P. Relationship between fracture toughness and acoustic emission during cleavage failure in adhesive joints. Wood Sci.Technol. 21, 121–130 (1987). https://doi.org/10.1007/BF00376192

Download citation

Keywords

  • Fracture Toughness
  • Acoustic Emission
  • Isocyanate
  • Polyvinyl Acetate
  • Cleavage Fracture