Variable Density Composite Systems Constructed by Metal Particle Modified Prepregs

Recently, new product designs have been suggested where it is necessary to vary the density of a composite part. In an earlier work, it was shown that the specific gravity of a cured laminate based on carbon fiber prepreg could be tailored to these applications by modifying the polymeric matrix with fine metal powders of various densities. This follow up study focused on altering the density of composites by changing the concentration of iron particles as a matrix modifier in prepreg materials. Experiments were performed to determine prepreg tack, laminate morphology and laminate fracture toughness. It was found that increasing the density of the materials with different concentrations of iron particles did not adversely effect toughness or interlaminar shear strength, although prepreg handling characteristics suffered slightly.