Collapse performance of externally pressurized resin egg-shaped shells with corrosion thinning

摘要

In this article, we discuss the collapse performances of externally pressurized egg-shaped shells with corrosion thinning. Shells consist of photosensitive resin, with major and minor axes of 256 and 180 mm, respectively. Corrosion begins at the critical location with the lowest principal meridional curvature. The circumferential corrosion values were set to 2.5 degrees, 5 degrees, 10 degrees, 20 degrees, 60 degrees, and 360 degrees, and the meridional corrosion values were defined as 20, 30, 40, and 50 mm. The corrosion depth was assumed to be 10%, 20%, 30%, and 40% of the wall thickness, respectively. A total of 96 partially corroded egg-shaped shells were numerically analyzed with regards to nonlinear collapse modes and ultimate strengths, in addition to one noncorroded shell and four fully corroded shells. On this basis, representative egg-shaped samples, including one noncorroded, four partially corroded, and one fully corroded case, were tentatively fabricated, carefully measured, and hydrostatically tested for further experimentation. The numerical and experimental data are provided in figures and tables.