Abstract
A thorough analysis of the isochromatic fringe patterns in duplex specimens with the crack tip on the interface was undertaken. The particular value of the elastic stress singularity (a value differing in general from that of 0·5) and the appropriate angular distribution of the stress field in the vicinity of the crack tip were taken into account. It was found necessary to introduce large correction factors to the usual photoelastic formula for the determination of stress intensity factors ( K) especially where the elastic moduli of the two materials of the specimen differed greatly. It was established that for certain intervals of the polar angle the greatest part of the correction factor is attributed to the stress singularity, while the influence of the particular angular stress distribution is of minor importance. It was concluded that for practical applications and recording data at the above-mentioned polar angle intervals, it suffices to use the usual formula for K determination by introducing the appropriate value of the stress singularity.
Published Version
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