Abstract
The temperature dependence of the impact fracture energy of composites reinforced with random-planar orientation of short fibers was studied theoretically and experimentally.The theoretical impact fracture energy of composites could be given by the sum of the fracture energy of matrix and fibers, and the energy to pull out fibers on crack surface, taking the temperature dependence of the critical fiber length and the breaking probability of fiber into consideration. The impact fracture energy was studied experimentally for epoxy resin and unsaturated polyester resin reinforced with random-planar orientation of short glass fibers. The theoretical values of impact fracture energy were in good agreement with the experimental ones. It was found for both composites that at room temperature, the impact fracture energy of fibers in a composite, while at higher temperature, the energy to pull out fibers, mainly contributes to the fracture energy of the composite.
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