Comparison of fatigue strength of post-weld improved high strength steel joints and notched base material specimens

Publikationstyp
Journal Article
Date Issued
2018-04-30
Sprache
English
Author(s)
Braun, Moritz  orcid-logo
Grimm, Jan-Hendrik  
Hoffmeister, Hasso  
Ehlers, Sören  
Fricke, Wolfgang 
Institut
Konstruktion und Festigkeit von Schiffen M-10  
TORE-URI
http://hdl.handle.net/11420/2449
Journal
Ships and offshore structures  
Volume
13
Start Page
47
End Page
55
Citation
Ships and Offshore Structures sup1 (13): 47-55 (2018-04-30)
Publisher DOI
10.1080/17445302.2018.1425522
Scopus ID
2-s2.0-85041003461
Keels of high-performance sailing yachts are highly stressed parts of the hull structure. Such keels are either milled or are welded hollow profiles. Recently a trend towards using high strength steel to manufacture keels is observed. While the fatigue strength of the parent material increases linearly with yield strength, it is independent of yield strength after welding. This problem can be overcome by post-weld improvement of the local weld geometry. Fatigue test results of the critical weld detail made from S900 steel are compared in welded state and after weld toe grinding. Additional tests of the same detail made from S355 steel, are performed. Moreover, tests of the notched parent material corresponding to a milled keel are presented. The fatigue strength of the grinded specimens was 2.2 times larger than in as-welded condition. The notched base material specimens act as an upper bound S-N curve for the post-weld improved specimens.