M iloslav Kepka jr.

University of West Bohemia in Pilsen, Pilsen, Czech Republic



The Regional Technological Institute, a research center of the University of West Bohemia, is currently working on two larger projects, the subject of which is the investigation of the potential of the high-frequency mechanical impact method (HFMI) for welds from steel sheets of various thicknesses and in a wide range of strength of welded steels.

The potential of the application of this method in designing the structures of rolling stock and steel bridges is investigated.

Partial results have already been presented at the 23rd European Conference on Fracture - ECF23, Procedia Structural Integrity 42 (2022) 762–768. The new results are based on a larger number of test samples and include results using the HFMI method for thin (4 mm) and very thick (90 mm) sheet welds. For these extreme values, results are not available in open sources. The results are compared with the recommendations of the International Institute of Welding.

The fatigue tests are complemented by measuring residual stresses by X-ray diffraction in several test specimens with the application of the HFMI before and after completing 10 million cycles at load values around the so-called fatigue limit.


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