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Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting

  • Ingrit Lillemäe-Avi
  • Sami Liinalampi
  • Eero Lehtimäki
  • Heikki Remes
  • Pauli Lehto
  • Jani Romanoff
  • Sören Ehlers
  • Ari Niemelä
Research Paper
  • 18 Downloads

Abstract

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.

Keywords

Fatigue strength High-strength steel Surface integrity Inclusions Hardness Residual stress Large-scale testing Ship structure 

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Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  • Ingrit Lillemäe-Avi
    • 1
    • 2
  • Sami Liinalampi
    • 2
  • Eero Lehtimäki
    • 2
  • Heikki Remes
    • 2
  • Pauli Lehto
    • 2
  • Jani Romanoff
    • 2
  • Sören Ehlers
    • 3
  • Ari Niemelä
    • 1
  1. 1.Meyer Turku OyTurkuFinland
  2. 2.School of Engineering, Department of Mechanical EngineeringAalto UniversityAaltoFinland
  3. 3.Hamburg University of TechnologyHamburgGermany

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