Publisher DOI: 10.1007/s40194-018-0638-y
Title: Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting
Language: English
Authors: Lillemäe-Avi, Ingrit 
Liinalampi, Sami 
Lehtimäki, Eero 
Remes, Heikki 
Lehto, Pauli 
Romanoff, Jani 
Ehlers, Sören 
Niemelä, Ari 
Issue Date: 1-Nov-2018
Source: Welding in the World 6 (62): 1273-1284 (2018-11-01)
Journal or Series Name: Welding in the World 
Abstract (english): This paper investigates experimentally the fatigue strength of high-strength steel, which has undergone the normal shipyard production process of plasma cutting, grinding, and sandblasting. The study includes steels with the yield strength of 355 and 690 MPa. The tested specimens are of dog-bone shape and represent the large-scale situation of a cruise ship balcony opening corner, loaded in shear or tension. The influence of surface roughness, internal inclusions, hardness, and residual stress on the fatigue strength are studied and discussed. Compared to the design curve as well as to the untreated surfaces, the results show significantly improved fatigue strength under constant amplitude loading at a load ratio of R = 0.1. However, very flat or even rising slope of the S-N curve indicates variations in the material and surface quality as well as in the residual stress. Surprisingly, internal defects even up to 100 μm in size did not decrease the fatigue strength.
URI: http://hdl.handle.net/11420/2440
ISSN: 0043-2288
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Type: (wissenschaftlicher) Artikel
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