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Abstract
By measuring the change of the atomic interplanar spacing during a tensile (or compressive) test by means of X-ray diffraction methods, the ‘lattice strain’ can be plotted as a function of the stress. Such stress-v.-lattice strain curves, studied particularly by Smith and Wood1, show that the lattice strain does not vanish when the applied stress is removed from the plastically deformed metal. This residual lattice strain must be due to microscopic residual stresses2, and an investigation of the residual strains helps to clarify the origin and distribution of these.
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