Hull Girder - First Yield Moment

First-yield bending moment of hull girder - minimum bending moment at which any fibre reaches yield, precursor to ultimate-strength M_u.

First yieldHull girderUltimate

Section modulus (min)m³Yield stressN/mm²

First-yield moment: 5,670,000kN·m

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

M_Y = Z \cdot \sigma_Y

Symbol	Meaning	Unit
$Z$	Section modulus at fibre of interest	m³
$\sigma_Y$	Material yield stress	N/mm²

Source: IACS UR S11A / CSR Ch.5

In short

First-yield bending moment of hull girder - minimum bending moment at which any fibre reaches yield, precursor to ultimate-strength M_u.

Learn the theory Hull Strength and Longitudinal Bending