Effect of particle size on fracture behavior of polyester/Al 2O 3 composites

Document Type

Conference Proceeding

Date of Original Version



A series of experiments were conducted to study the effect of the size of filler particles on fracture behavior of polyester/Al 2O 3 composites materials. The composites have filler sizes of 14 nm, 3μm and 110 μm, respectively, with 1% filter volume fraction. High strain rate testing conducted using a split Hopkinson pressure bar apparatus revealed a moderate increase in fracture toughness with the decrease of particle size. The three different composite materials were then characterized for their dynamic fracture constitutive behavior. Dynamic photoelasticity coupled with high-speed photography was used to obtain the dynamic stress fields around the propagating cracks. A relationship between the dynamic stress intensity factor, K 1, and the crack tip velocity, ȧ, for the propagation event was established and compared for all three materials.

Publication Title

Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006



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