Publikacje

Abstract:

This paper presents the research results on the mechanical behavior of the low-carbon
rolled steel of a sea portal crane after a 33-year operation depending on the operational stresses and
rolling direction in order to assess its serviceability. The tensile properties of steels were investigated
using rectangular cross-section specimens with different thicknesses and the same width. Strength
indicators were slightly dependent on the considered factors (operational conditions, the cutting
direction, and thickness of specimens). However, a clear trend of higher ultimate strength for
thinner specimens was noticed, especially in the case of more brittle material due to its operational
degradation. Plasticity of the tested steel specimens was more sensitive to the influence of the
above-mentioned factors than strength but less sensitive than impact toughness. Uniform elongation
was slightly less for thinner specimens regardless of the investigated steel state or the orientation of
specimens relative to the rolling direction. The post-necking elongation was lower for transversal
specimens compared with longitudinal ones, and the effect was more significant when testing steel
with the lowest brittle fracture resistance. Among the tensile properties, non-uniform elongation was
demonstrated to be the most effective for assessing the operational changes in the state of rolled steels.

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Specimen Size Effect on the Tensile Properties of Rolled Steel of Long-Term-Operated Portal Crane