Abstract
The effects of rubber modification and adhesive thickness on the fatigue-fractured surfaces of epoxy adhesives under mode I cyclic loading were examined using fractals. When the energy release rate range, ΔG1 is higher than 100 J/m2, the fractal dimension of fractured surfaces becomes high due to rubber modification under the same ΔG1. The fractal dimension decreases with increasing fatigue crack growth rate, da/dN. A relationship is given by the following equation between the parameter, S (=da/dN×ΔG1) and the fractal dimension, D for unmodified and rubber-modified adhesives. log S-log((da)/(dN)·ΔG1)=α4·D+β4 where α4 and β4 are experimental constants. Whether the adhesives contain rubber particles or not, the fractal dimension as well as the da/dN-ΔG1 relation is little affected by adhesive thickness.
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