RULES DET NORSKE VERITAS (DNV) = STRUCTURES = - Boat Design Net

Amended July 2011, see page 3 Rules for High Speed, Light Craft and Naval Surface Craft, January 2011Pt.3 Ch.3 Sec.10 – Page 47K J − 0 from Fig.1 or from formulaσ c or τ cK J− 0 = 1 ------------------------------- – 1 2–0.5( σ f or τ f ) Fig. 1Forσ----- c< 0.5, Kσ J – 1 = 1f---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---B 100 Longitudinal stresses101 See Ch.l Sec.3 A700.B. Longitudinal Buckling LoadC. Transverse Buckling LoadC 100 Transverse stresses101 Transverse hull stresses in compression may occur from:— transverse loads and moments in twin hull craft, see Sec. 4 E— supports of craft's side structure, see Sec. 6.D. PlatingD 100 Plate panel in uni-axial compression101 The ideal elastic buckling stress may be taken as:tσ el = 0.9 k E ------------- 2 (N/mm 2 )1000sFor plating with longitudinal stiffeners (in direction of compressive stress):8.4k = k l = ----------------- ψ + 1.1for (0 ≤ ψ ≤ 1)For plating with transverse stiffeners (perpendicular to compressive stress):sk = k s = c 1 + -2l2 2.1----------------- for (0 ≤ ψ ≤ 1)ψ + 1.1DET NORSKE VERITAS AS