Characterization of Interfacial Bond Strength by Dynamic Analysis

Abstract

Short beam shear, double cantilever beam, and torsional dynamic mechanical (DMA) tests were performed on composite materials systems to characterize the interfacial bond strength. The composite materials were unidirectional flat laminate with different fiber surface treatments and sizings. The results indicated that the DMA test was superior to the short beam shear and double cantilever beam test for measuring fiber/ matrix bonding. The DMA tests detected the effect of surface treatment with much greater accuracy than the standard mechanical tests. Also, DMA tests readily detected the differ ence in fiber/matrix bonding of PAN-based and pitch-based fibers. The DMA test had the additional feature of being able to isolate fiber/matrix interface effects from matrix and fiber effects.