Thermosets Toughening by Creation of Residual Compressive Stresses
Toughening of thermosets by creation of residual compressive stresses around microspheres is studied. Expandable hollow micro-spheres containing liquefied gas were used for the creation of residual compressive stresses. Microscopic compressive residual stresses around the micro-spheres in the vicinity of the crack tip were graphically analysed and related to macroscopic mechanical behaviour for mode I fracture. It was confirmed that toughening was due to residual compressive stresses rather post-cure effect.
Hong-Yuan Liu, Xiaozhi Hu and Mark Hoffman
H. S. Kim and N. H. Kim, "Thermosets Toughening by Creation of Residual Compressive Stresses", Key Engineering Materials, Vol. 312, pp. 3-8, 2006