Reduction on factor of permissible stress for panels of naval ships
Through control of the panel center plastic deformation,CSR-H sets up failure criteria for AC-S and AC-SD conditions,and provides prescriptive evaluation formulas for stiffened panels which may consider the influence of longitud-inal global stress.Within technical background,CSR-H did not provide derivation process of these factors,and the targets were mainly thick panels of oil tankers and bulk carriers.In this paper,plastic deformation is calculated under different com-binations of in-plane stress and uniform pressure.Reduction factors are fitted,compared and verified by formulas of CSR-H,and its trend is in good agreement.Considering the significant deviation of material and scantlings,a group of standard stiffened panels on naval ship are evaluated.A new reduction curve is fitted and recommended.
rule requirementslocal strength of panelslongitudinal stressreduction factor of permissible stress
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