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<p>This study conducts a series of numerical simulations to evaluate the effects of initial distortions, residual stresses, and uniform corrosion on the response of steel stiffened panels. To achieve this, the nonlinear finite element method (NFEM) was employed for structural modeling and analysis. A stiffened panel from the outer bottom structure of a bulk carrier was selected as a case study. The results concerning thickness degradation, ultimate compressive stress, and stress distribution are summarized in this paper. According to the findings, after 30&#xa0;years of service, the plate thicknesses decreased by 7.3–9.1% compared to their original values, while the ultimate compressive stress was reduced by approximately 11.6% compared to that of the uncorroded structure. Another important conclusion is that corrosion fundamentally alters the failure mechanism and stress redistribution patterns within the stiffened panel, a critical factor for structural health monitoring.</p>

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Numerical study of bottom stiffened panels under combined loading with initial imperfections and uniform corrosion

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Van Tuyen Vu,
  • Quang Thang Do,
  • Van Tuyen Doan,
  • Huy Chinh Cu,
  • Tuan Anh Vu

摘要

This study conducts a series of numerical simulations to evaluate the effects of initial distortions, residual stresses, and uniform corrosion on the response of steel stiffened panels. To achieve this, the nonlinear finite element method (NFEM) was employed for structural modeling and analysis. A stiffened panel from the outer bottom structure of a bulk carrier was selected as a case study. The results concerning thickness degradation, ultimate compressive stress, and stress distribution are summarized in this paper. According to the findings, after 30 years of service, the plate thicknesses decreased by 7.3–9.1% compared to their original values, while the ultimate compressive stress was reduced by approximately 11.6% compared to that of the uncorroded structure. Another important conclusion is that corrosion fundamentally alters the failure mechanism and stress redistribution patterns within the stiffened panel, a critical factor for structural health monitoring.