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

doi:10.1007/s40194-018-0638-y

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 output: Contribution to journal › Article › Scientific › peer-review

1 Citation (Scopus)

33 Downloads (Pure)

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.

Original language	English
Pages (from-to)	1273-1284
Number of pages	12
Journal	Welding in the World
Volume	62
Issue number	6
DOIs	https://doi.org/10.1007/s40194-018-0638-y
Publication status	Published - Nov 2018
MoE publication type	A1 Journal article-refereed

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Lillemäe-Avi, I., Liinalampi, S., Lehtimäki, E., Remes, H., Lehto, P., Romanoff, J., ... Niemelä, A. (2018). Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting. Welding in the World, 62(6), 1273-1284. https://doi.org/10.1007/s40194-018-0638-y

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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.",

author = "Ingrit Lillem{\"a}e-Avi and Sami Liinalampi and Eero Lehtim{\"a}ki and Heikki Remes and Pauli Lehto and Jani Romanoff and S{\"o}ren Ehlers and Ari Niemel{\"a}",

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Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting. / Lillemäe-Avi, Ingrit; Liinalampi, Sami; Lehtimäki, Eero; Remes, Heikki ; Lehto, Pauli ; Romanoff, Jani; Ehlers, Sören; Niemelä, Ari.

In: Welding in the World, Vol. 62, No. 6, 11.2018, p. 1273-1284.

Research output: Contribution to journal › Article › Scientific › peer-review

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AU - Lillemäe-Avi, Ingrit

AU - Liinalampi, Sami

AU - Lehtimäki, Eero

AU - Remes, Heikki

AU - Lehto, Pauli

AU - Romanoff, Jani

AU - Ehlers, Sören

AU - Niemelä, Ari

PY - 2018/11

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AB - 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.

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