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The failure of metals by fatigue has been investigated by applying precise methods of X-ray diffraction to a systematic study of the changes produced in the crystalline structure under various conditions of test. The material used for the experiments was a normalized mild steel (0*1% C). The fatigue tests were of three distinct types involving, respectively, (a ) cycles of reversed torsional stressed, (b ) cycles of reversed direct stresses, and (c ) cycles of alternating direct stresses where the superior stress of the cycle was maintained at a constant value of tensile stress exceeding the static yield point of the material. In addition, comparable observations have been made of the changes in structure arising from the application of static tensile and static torsional stresses of various intensities including those causing fracture.

A new attack upon the problem of fatigue of metals, using X-ray methods of precision