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Abstract
Photon emission from an interface and electric current fluctuation between fibre and matrix were studied using a tungsten fibre reinforced epoxy pullout specimen, to determine the initial interface debonding event. Direct observation of the interfacial debonding behaviour was carried out separately, for comparison with photon emission results and electric current measurements. Photon emission and electric current fluctuation were observed simultaneously, and the load at these events was nearly the same as that found at the onset of interface debonding by direct observation. Both techniques were found to be effective tools for determination of initial interface debonding, because the behaviours originated from a discharge at the interface which occurred just after the onset of debonding.