Use of head and bulk waves to assessing damage of the St3sp5 steel under fatigue

An approach is proposed for assessing the damage to the material of a welded joint by measuring the velocities of bulk shear and head waves. Use different waves make it possible to analyze the destruction processes in the material, both in the volume and in the near-surface layers that are most destruction under fatigue. The relationships between damage calculated by the hypothesis of linear damage summation and the ratio of the velocities of head waves and shear waves were studied. The studies were carried out on specimens cut from the base metal and cut from the heat-affected zone of the welded joint material made of St3sp5 steel. The relationships between the change in velocities and damage were obtained, that can be used for estimation of fatigue life by the acoustic method.
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