The EWF approach was successfully used to characterize the fracture behavior of the medium density Polyethylene (MDPE) as well as that of the composite samples when 1, 2.5 and 5wt.% CaCO3 nanoparticles are added to MDPE. It was shown the CaCO3 nanoparticles added into the MDPE matrix in all quantities to decrease the specific essential work of fracture. This detrimental effect of CaCO3 nanoparticles was attributed to the introduction of a certain number of stress concentration sites within the matrix and the fact that the situation becomes much more severe when greater amounts of nanaoparticles are added to the composite giving rise also to increase the chance of particles agglomeration during the manufacture of test specimens.

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