Study On Polymer Matrix Smart Composite Materials

Polymer matrix smart composite materials are the most active section in smart materials or intelligent materials field. Currently used sensor materials including optic fiber, pressure sensitive materials and strain metal alloys. In recent years people abroad researched on the change of resistivity cause by the facture of carbon fiber at 0 angle direction and prepared smart composite materials with the ability of sensor the change of stress. But there are few domestic reports about the carbon fiber reinforced smart composites with self-diagnose character. So it is necessary to study and analysis carbon fiber reinforced smart composite material.This paper mainly study two kinds of smart materials which are both reinforced by chopped carbon fiber mat but use two different kinds of polyester resin as matrix and discuss the influence of content of carbon fiber on conductivity. Focus on the relationship between strain and volume resistivity under tensile condition influenced by the factors such as resin matrix and fiber content. The regressive equation that described the relationship between resistivity and strain are determined. To prove the applicability of the relationship, we composite the conductive composite material prepared by chopped carbon fiber mat with glass fiber reinforced composites of different strain character and study the relations of strain to resistivity under tensile stress. It is proved that the equation fit the regulations very well.Based on this equation we can predict the strain of composites by the change of resistivity and a series of carbon fiber reinforced resin smart composite materials are produced with the ability of self-examine and self-diagnose. Also the regulations of stain and resistivity of smart composite with additives of continuous carbon fiber and graphite are analyzed.