Extension of technology and developments in polymer based nanocomposites in latest years causes special attention to medical applications. one of this applications is strain gauges with high stretchability. Main task of extended group of these strain gauges is spacing between nano particles in matrix bed that causes reduction in conductivity of nanocomposite. If silicon rubber gets used as matrix, its hyperelastic property and capability to get up to 300 percent elongation make this sensor suitable for installing on skin of any part of human body. In this research it has been tried to modeling electromechanical behavior of nanocomposite by addition of experimental sample fabrication with carbon nano tubes and silicon rubber. For modeling section, tunneling resistance theory has been used assign a resistant between two nano particle in according to their distance from each other. For verifying model results with experimental results, a new concept has been introduced that is named Effective Distance and achieved from multiplying a factor by particles distance. Then dependency of this factor has been checked by strain, aspect ratio and weight fraction of nano particles in matrix. Finaly it’s observed that factor of effective distance has e behavior like a polynomial function of strain and with considering of larger aspect ratio, by increasing strain, the reduction value of conductivity decreases. Furthermore, by increasing surface density of nano particles, this factor increases that is compeletely acceptable by experimental observations.
