According to International Standards, hull girder deflection is limited to 1 mm per meter of ship length. As per the classification rules, no specific limits on hull girder deflections are given explicitly, but the L/D ratio on the design stage is related to the criteria which allows safeguarding against excessive deflection. It is appreciated that the deflection, hence stiffness against bending, depends upon both geometry (moment of inertia, I) and elasticity (E).
Maximum Deflection values depend on the distributions of the maximum bending moment and the moment of inertia as obtained by the second integration of the Bending Moments divided by the moment of inertia curve.
It is expected the maximum value of the deflection to correspond to the maximum value of the bending moment at the cross section.
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