Elastic buckling behavior of corroded uniformly compressed plates with three simply supported edges

This paper mainly investigates the elastic buckling behavior of corroded uniformly compressed plate with three simply supported edges. The variation of geometric characteristics of corroded plate along the length was investigated by the accelerated corrosion test and reverse reconstruction of corroded surface. The eigenvalue buckling analysis was also carried out to reveal the influence of corrosion degree, area and location on the elastic buckling load of simply supported plate. Based on the analysis, the theoretical formula of the critical buckling load of corroded uniformly compressed plate with three simply supported edges was established by the energy method. The results showed that the residual thickness of corroded plate from flange and web changed along the length, and decreased with the corrosion age, but the relationship for some plate was not obvious due to local corrosion. The first-order buckling mode of corroded plate was asymmetric and the highest peak was located in the weak section of plate. The elastic buckling load of plate decreased gradually with the corrosion depth and area. In addition, the perforation reduced the buckling half-wavelength of plate, which played the role of wavelength strengthening, leading to the increase of elastic buckling load. The closer the distance between the corrosion zone and the free edge of plate was, the smaller the elastic buckling load was. Finally, on the basis of response surface method, the key parameters governing local buckling were identified, leading to easy-to-use formulae to determine the elastic buckling load of corroded uniformly compressed plates with three simply supported edges.

Automated summary

This paper mainly investigates the elastic buckling behavior of corroded uniformly compressed plate with three simply supported edges. The variation of geometric characteristics of corroded plate along the length was investigated by the accelerated corrosion test and reverse reconstruction of corroded surface. The eigenvalue buckling analysis was also carried out to reveal the influence of corrosion degree, area and location on the elastic buckling load of simply supported plate. Based on the analysis, the theoretical formula of the critical buckling load of corroded uniformly compressed plate with three simply supported edges was established by the energy method. The results showed that the residual thickness of corroded plate from flange and web changed along the length, and decreased with the corrosion age, but the relationship for some plate was not obvious due to local corrosion. The first-order buckling mode of corroded plate was asymmetric and the highest peak was located in the weak section of plate. The elastic buckling load of plate decreased gradually with the corrosion depth and area. In addition, the perforation reduced the buckling half-wavelength of plate, which played the role of wavelength strengthening, leading to the increase of elastic buckling load. The closer the distance between the corrosion zone and the free edge of plate was, the smaller the elastic buckling load was. Finally, on the basis of response surface method, the key parameters governing local buckling were identified, leading to easy-to-use formulae to determine the elastic buckling load of corroded uniformly compressed plates with three simply supported edges.