透過光, 反射光を利用した複合材料の非破壊検査

概要

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Alumina-fiber-reinforced epoxy (alumina/epoxy) is often used in making the thermal insulating structure of superconducting magnet because it is stiff and strong and has a low thermal conductivity. The stiffness of the alumina/epoxy structure is one of the factors determining the soundness of a superconducting magnet, so it is important that the relation between the degradation in stiffness and the growth in the size of defects in alumina/epoxy is determined. A new defect-monitoring method using light transmitted through alumina/epoxy has therefore been developed. Defects inside a semitransparent alumina/epoxy laminate will scatter the light and decrease its intensity. The spectra of the transmitted and reflected light were measured using a spectrometer in order to identify the wavelengths most sensitive to defects in alumina/epoxy. With decreasing stiffness, the intensity of transmitted light decreased and that of the reflected light increased. These changes were most obvious at wavelengths from 400 to 800 nm, so it seems that measuring the intensity of transmitted visible light is a promising method for assessing the structural integrity of alumina-reinforced epoxy.
社団法人日本機械学会の論文
2000-08-25