ShipCalculators.com

Midship Section Modulus - Rule Minimum

Rule-minimum midship section modulus from total bending moment (SWBM + WBM) and the allowable stress per IACS UR S11.

Section modulusIACS S11
Loading calculator…

Formula, assumptions, and limits

Zreq=MSW+MWσallowZ_{req} = \frac{M_{SW} + M_W}{\sigma_{allow}}
SymbolMeaningUnit
MSWM_{SW}Still-water BMkN·m
MWM_WWave BMkN·m
σallow\sigma_{allow}Allowable nominal stressN/mm²

Source: IACS UR S11 Rev.12

In short

Rule-minimum midship section modulus from total bending moment (SWBM + WBM) and the allowable stress per IACS UR S11.

Learn the theory Hull Strength and Longitudinal Bending