Application of electric resistance method in evaluating the interphase carrying capacity in single carbon fiber composite

In order to study the interphase stress transfer property of the fiber reinforced resin matrix composite, the researchers, were able to test the tensile property of single T300 carbon fiber, by examining the relationship between the electric resistance and the strain. The data collected indicated there was a linear relationship between them. After collecting the data, the coefficient of sensitivity K was acquired by means of computations. Next, a two-dimensional loading platform was built to load the tilted cross samples in tension and the stress distribution under loading was observed in real time through a digital polarizing microscope. The results demonstrated that the stress was homogeneous in its central region. Based on the above results, by combining the single carbon fiber electric resistance measurement method with the tilted cross model, the stress transfer efficiency in this single fiber composite system was confirmed with the caliberated coefficient of sensitivity. Thus the measurement of the mechanical properties of the interphase under mixed-mode loading was realized.