TY - JOUR
T1 - Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting
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
Y1 - 2018/11
N2 - 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.
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.
U2 - 10.1007/s40194-018-0638-y
DO - 10.1007/s40194-018-0638-y
M3 - Article
VL - 62
SP - 1273
EP - 1284
JO - Welding in the World
JF - Welding in the World
SN - 0043-2288
IS - 6
ER -