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Application studies for fatigue strength improvement of welded structures by high-frequency mechanical impact (HFMI) treatment
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. Department of Applied Mechanics, School of Engineering, Aalto University, Aalto, Finland.
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2016 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 106, 422-435 p.Article in journal (Refereed) PublishedText
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 106, 422-435 p.
Keyword [en]
High-frequency mechanical impact (HMI), Large-scale structures, Fatigue strength improvement, High-strength steels, Light-weight design
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-180588DOI: 10.1016/j.engstruct.2015.10.044ISI: 000367022000032ScopusID: 2-s2.0-84946601099OAI: diva2:896605

QC 20160121

Available from: 2016-01-21 Created: 2016-01-19 Last updated: 2016-02-02Bibliographically approved

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