Random field modelling of mechanical behaviour of corroded thin steel plate specimens

To study the effect of corrosion on the bearing capacity of compression-bending steel members, especially the local buckling behaviors, six H-shaped Q345 steel short columns with different corrosion degrees were designed. The outdoor accelerated corrosion test for up to 2 years, monotonic tensile test of standard specimens and eccentric compression test of steel columns were carried out, respectively. The volume loss ratio was used to evaluate the corrosion degree of each specimen. The relationships between failure mode, bearing capacity and deformation behavior to corrosion degree were analyzed. In addition, based on the experimental result, the interactive modeling was carried out by the software Geomagic Studio and ABAQUS, and then the deterioration laws of the bearing capacity of corroded H-section compression-bending steel members under the real corroded surface was also studied. The results showed that the bearing capacity of H-section compression-bending steel member decreased gradually with the increase of corrosion degree, and the yield load, ultimate load and buckling load of the most seriously corroded specimen PY-6 decreased by 22.8%, 23.4% and 33.3%, respectively. Corrosion changed the failure modes of the specimens and gradually decreased the half-wavelength of local buckling, which weakened the plastic deformation capability of specimens, and leaded to the transformation of steel members from strength failure to stability failure. Finally, the novel method considering the corrosion surface morphology was verified by comparing the finite element solutions to the experimental result. It was found the rough surface of the corroded specimens caused the uneven stress distribution and stress concentration. The location of maximum stress was located in the most severely corroded area, which leaded to the failure of the specimens.

Experimental and numerical investigation of corroded steel columns subjected to in-plane compression and bending

Experimental study on the fatigue behavior of corroded steel wire

To investigate the effect of corrosion on the local and post-buckling behavior of axially-compressed steel members, H-shaped Q345B steel columns with different corrosion degrees were obtained by accelerated corrosion test. Then, an axial compression test was performed to analyze the relationships between the failure mode, local buckling load, and ultimate load and the corrosion degree. Finally, more than 80 finite element models of steel columns with different corrosion parameters were established in the software ABAQUS, and a modified direct strength method for corroded axially-compressed steel stub columns considering local buckling was proposed. The results showed that the axial-load capacity of the axially-compressed steel column decreased gradually with the increased degree of corrosion. The yield load, ultimate load and local buckling load of the most seriously corroded specimen decreased by 15.0%, 18.9% and 21.4%, respectively. The corrosion changed the failure modes of specimens and gradually decreased the half-wavelength, which weakened the plastic deformation capability of specimens and led to the failure mode of the steel columns transforming from strength failure to stability failure. In addition, the corrosion pits had less of an effect on the axial-load capacity of specimens than the thickness loss. Under the same corrosion type, the location and size of the corrosion would not affect the ultimate load of the axially-compressed members, which only depended on the damage degree of weakest section. Finally, the proposed formula can accurately predict the post-buckling behavior and ultimate load of corroded H-shaped axially-compressed steel columns by comparing the experimental data with the finite element results and the results in the existing literature.

Local and post-buckling behavior of corroded axially-compressed steel columns

Stochastic constitutive model of structural steel based on random field of corrosion depth

Effect of cleaned corrosion surface topography on mechanical properties of cold-formed thin-walled steel

To comparatively investigate the effect of corrosion on the mechanical properties of different parts of C-shaped thin-walled steel, the flat and corner parts of C-shaped steel purlin, with a service life of 9 years in an industrial environment, were processed into the tested specimens. The effect of corrosion on the cold-formed effect of C-shaped thin-walled steel was investigated by fracture morphology and stress-strain curves. Thus, three methods for calculating the yield strength of cold-formed steel with corrosion damage were also proposed. Finally, based on reverse reconstruction technology, ABAQUS software was used to analyse the effect of corrosion surface morphology on the stress distribution and for the same specimens with different thicknesses. The results showed that different fracture modes and characteristics occurred in both the flat and corner parts after corrosion, which can be attributed to the corrosion surface and thickness reduction. With an increasing degree of corrosion, the strength of the corner parts obviously decreased more than the strength of the flat parts. When the corrosion ratio was 36%, the yield ratio of the corner parts was as high as 0.99, and the elongation was only 2.8%. The corrosion aggravated the cold-formed effect on the strength and the ductility of cold-formed materials. In addition, the corrosion surface will lead to the unbalanced development of surface stress, resulting in the diversification of fracture paths and locations. Especially when the corrosion surface was more uneven with depth, the stress at the maximum corrosion depth was always greater than the stress at other locations. The effect of the corrosion surface on the mechanical properties was related to the residual thickness of the specimens and increased with thinner residual thickness.

Comparative investigation of the effect of corrosion on the mechanical properties of different parts of thin-walled steel

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Papers

Effect of cleaned corrosion surface topography on mechanical properties of cold-formed thin-walled steel

Comparative investigation of the effect of corrosion on the mechanical properties of different parts of thin-walled steel

Experimental and numerical investigation of corroded steel columns subjected to in-plane compression and bending