A method for characterizes the interface between carbon fiber and epoxy resin: three-parameters exponential pattern

A new method for characterizing the interfacial performance between fiber and matrix was introduced in this paper, which was called three-parameters exponential pattern method (TPEPM). TPEPM belongs to neither macro- nor micro-measurement method. It was able to characteristic both macro- and micro-interfacial performance of composites efficiently at the same time. It could be attributed to meso mearsurement method. After verified by traditional method (short beam shear), it proved that the method of three-parameters exponential pattern has high reliability. The periodic time of experiment was shorter and could obtain more effective datum than before. The process of producing specimens as well as the procedure of testing was described detailedly. The way of testing the shear strength was according to the following formula:image. In this formula, τ is the shear strength (MPa), P the shear force (N), bl express the area of adhesion. The dispersion pattern graph of shear strength (τ) and adhesion area (s) was made. It can be found that they have the similar variation regularity with exponential curve, which was proved by a great deal of experiment. The three-parameters exponential curve was fitted by the method of least squares. The variable regularity of the parameters τ0, τ1 and λ were compared with interlaminar shear strength (short beam shear). It was proved that the method was reliable.