Abstract
This paper proposes a direct method to measure interfacial bonding strength between reinforcing fibers and resin. A wedge with a dull angle is indented to a unidirectional fiber reinforced plastic of a small fiber volume fraction and the interfacial bonding strength is measured by comparing the optical and photoelastic observations of the interfacial debonding state and the internal state stress at the interface of the fiber and the resin under the wedge face. Several examples are shown to measure interfacial bonding strength for various surface treated glass fiber reinforced plastic materials. The results indicate that the present method is very effective.
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