Application studies for fatigue strength improvement of welded structures by high-frequency mechanical impact (HFMI) treatment

Halid Can Yildirim, Martin Leitner, Gary B. Marquis, Michael Stoschka, Zuheir Barsoum

Research output: Contribution to journalArticlepeer-review


In 2013, a new guideline for the design of high-frequency mechanical impact (HFMI) treatment was drafted. The proposed design curves were made based on the fatigue data of axially-loaded welded joints which were manufactured from high-strength steels. All the S-N curves were shown to be conservative with respect to the existing fatigue data for laboratory-scale specimens of longitudinal, transverse, and butt welds. In reality, structures in civil, offshore, mechanical engineering and ship industries generally include large-scale and more complicated components rather than laboratory-scale specimens. Therefore, this paper firstly presents the validation of design proposals by considering fatigue data sets for large-scale welded structures. In total, 62 fatigue data points for bridge, crane and beam-like components are reported, in which the yield strength varies from 250 to 725 MPa, and stress ratio varies from -1 to 0.56. Validations are then extended also for cover plates by performing fatigue tests of 23 weld details both in as-welded and HFMI-treated cases for the use of crane industry. Both the extracted and obtained fatigue data are found to be in good agreement with the previously-proposed design guidelines for nominal and effective notch stress assessment.
Original languageEnglish
Pages (from-to)422-435
Number of pages14
JournalEngineering Structures
Publication statusPublished - 2016
Externally publishedYes

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