The residual stress plays a key role in determining: the life and dimensional stability of n precision13; machine component. This article review the various factors leading lo the formation of residual stresses and13; describes the x-ray diffraction technique for the measurement residual stresses. Emphasis is given to the recent developments which. Permit the estimation of(a) triaaial stresses, (b) stresses in the various phases of a multiphase material such as ceramic composites, and (c)The stresses in Composites containing non-crystalline or poorly Crystalline materials such be polymer matrix composites. Some example are given from the work carried out at the National Aerospace Laboratories.
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