When cracks appear on the surface of a machine element, they can often be treated and the service operation of the machine can be prolonged. When cracks appear inside the material of the corresponding machine element, the internal fatigue crack grows during operation, and when it reaches the surface, the catastrophic failure is already unavoidable. One way to handle this problem is the precise prediction of the repeated tensile stresses in the material, and the results of this method are to be used already at the design stage. The paper deals with the explanation and numerical calculation of tensile stresses related to travelling waves induced by impacts in tups during forging.

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