Acta Mechanica Sinica

, Volume 5, Issue 4, pp 332–342 | Cite as

Bridging toughening of epoxy resins by dispersed thermoplastics

  • Yang Wei
  • Fu Zengli
  • Sun Yishi


The particulate toughening behaviour of epoxy resins modified by ductile thermoplastics is elucidated here by various bridging models. The experimental data for three different epoxy/PSF systems are presented to illustrate the trend of the toughening characteristics. The conventional continuous bridging model is shown to have underestimated the effect of the particulate toughening. Ajoint application of the discrete bridging model and the multiple bridging model, however, shows promising result for modified epoxy systems such as AG80/DDS/PSF and E51/DDS/PSF. These models also provide quantitative descriptions for the crack pinning phenomenon previously observed by Fu and Sun[1] in AG80/DDS/PSF.

Key Words

bridging model toughening crack pinning 


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  1. [1]
    Sun, Y. and Fu, Z., Epoxy resin toughened by thermoplastics,Chinese J. Polym. Sci., (1989), no. 4.Google Scholar
  2. [2]
    McGarry, F.G. et al., Toughening of an epoxy resin by an elastomeric second phase,Research Rep. R68-8, MIT (1968).Google Scholar
  3. [3]
    Kunz-Douglas, S., Beaumont, P.W.R. and Ashby, M.F.,J. Mater. Sci., vol.15 (1980), 1109.CrossRefGoogle Scholar
  4. [4]
    Kinlock, A.J., Maxwell D.L. and Young R.J.,J. Mater. Sci., vol.20 (1985), 4169.CrossRefGoogle Scholar
  5. [5]
    Rose L.R.F., Toughening due to crack-front interaction with a second phase dispersion,Mech of Mater., vol.6 (1987), 11–15.CrossRefGoogle Scholar
  6. [6]
    Budiansky, B., Amazigo, J. C. and Evans, A. G., Small-scale crack bridging and fracture toughness of particulate-reinforced ceramics,J. Mech. Phys. Solids, vol.30, (1988) 167–187.CrossRefGoogle Scholar
  7. [7]
    Sih, G.C. and Liebowitz, H., Mathematical theories of brittle fracture, inFracture, vol. 2, ed. by Liebowitz H., (1968), section V.Google Scholar
  8. [8]
    Evans A. G., The strength of brittle materials containing second phase dispersions,Phil. Mag., vol.26 (1972), 1327.Google Scholar
  9. [9]
    Koiter W. T., An infinite row of collinear cracks in an infinite elastic sheet,Ingen. Archiv, vol.28 (1959), 168–172.zbMATHMathSciNetCrossRefGoogle Scholar

Copyright information

© Chinese Society of Theoretical and Applied Mechanics 1989

Authors and Affiliations

  • Yang Wei
    • 1
  • Fu Zengli
    • 1
  • Sun Yishi
    • 1
  1. 1.Tsinghua UniversityBeijingChina

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