Resistance Response of Carbon Nanofibers to Mutiaxial Strain

Abstract

Carbon nanofiber materials play an important role in many fields, and the research on carbon nanofiber is very extensive. In order to explore the mechanical resistance response of carbon nanofibers under axial and transverse strain, the carbon nanofibers are soaked into the resin and pasted on the surface of the structure. Then, the mechanical resistance response law of Carbon Nanofibers under several different strain states is obtained by four-point bending experiment. The experimental results show that carbon nanofibers have different sensitivity to tensile strain and compressive strain. The sensitivity coefficients to axial tensile strain and compressive strain are 11.4 and 2.1 respectively. The sensitivity coefficients to transverse tensile strain and compressive strain are 0.6 and −1.0, respectively. By using these coefficients, the sensitivity of carbon nanofibers applied to strain sensing of uniaxial stress components is deduced. The results show that the axial sensitivity of carbon nanofibers decreases with the increase of Poisson's ratio under uniaxial tensile stress and the axial sensitivity of carbon nanofibers increases with the increase of Poisson's ratio under uniaxial compressive stress.