Design of Outfit Elements in Ships for Fatigue Technical ... - EWF

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Page 2 of DVS 3501 Comments Description of Type of connection Detail category ∆σR Equipment Detail Sketch of connection with fatigue crack and stress considered σ Stress concentrations caused by the opening to be considered as follows 140 (m0 = 4) Plate edges punched or machine-cut by means of a thermal cutting process. The cutting surface is free of cracks and notches. Cutting edges are chamfered or rounded 1.1 Openings uniaxially loaded ∆σmax = K1 ⋅ ∆σN bzw. ∆σRperm ≤ ∆σR /K t K t: Notch factor according to GL Section 3 ∆σN: Nominal stress range related to net section alternatively direct determination of ∆σmax from FE-calculation, especially in case of multiple arrangement of openings Plate edges which are not meeting the above mentioned requirements, but are free from cracks and sharp notches 125 (m0 = 3.5) Machine cut or punched: or σ x >> σ y 100 (m0 = 3.5) Manually cut: Stress concentrations caused by the opening to be considered as follows 140 (m0 = 4) Plate edges punched or machine-cut by means of a thermal cutting process. The cutting surface is free of cracks and notches. Cutting edges are chamferred or rounded 1.2 Openings biaxially loaded ∆σmax = K1 ⋅ ∆σN K t: Notch factor according to Fig. 2 ∆σN : Nominal stress range related to net section alternatively direct determination of ∆σmax from FE-calculation, especially in case of multiple arrangement of openings Plate edges which are not meeting the above mentioned requirements, but are free from cracks and sharp notches 125 (m0 = 3.5) Machine cut or punched: 100 (m0 = 3.5) Manually cut: σ x ≈ σ y Stress concentrations caused by the opening to be considered as follows 140 (m0 = 4) 1.3 Openings shear-loaded Plate edges punched or machine-cut by means of a thermal cutting process. The cutting surface is free of cracks and notches. Cutting edges are chamferred or rounded ∆σmax = K1 ⋅ ∆σN K t: Notch factor according to Fig. 3 ∆σN : Nominal stress range related to net section alternatively direct determination of ∆σmax from FE-calculation, especially in case of multiple arrangement of openings Plate edges which are not meeting the above mentioned requirements, but are free from cracks and sharp notches 125 (m0 = 3.5) Machine cut or punched: 100 (m0 = 3.5) Manually cut:
Comments Description of Type of connection Detail category ∆σR Equipment Detail Sketch of connection with fatigue crack and stress considered σ 71 63 1.4 Pipe penetration Pipe penetrating a plate with circumferential fillet weld d ≤ 50 mm d > 50 mm Note: In case of large diameters an assessment based on local stresses is recommended Assessment corresponding to doubling plate 63 56 50 1.5 Drain plugs Drain plugs according to DIN 87721-1 (Diameter about 190 mm) tD ≤ 0.8 t 0.8 t < tD ≤ 1.5 t tD > 1.5 t For t2 ≤ 0.7 ⋅ t1 ∆σR can be upgraded by one category, however not beyond 80 80 71 63 56 Stiffener welded to a plate in loading direction R ≤ 50 mm 50 mm < R ≤ 150 mm 150 mm < R ≤ 300 mm R > 300 mm 2.1 Holder in unsupported plate panel arranged parallel to main load 80 Stiffener welded to a plate transversely to load direction (valid for short and long stiffeners) 2.2 Holder in unsupported plate panel arranged transverse to main load Page 3 of DVS 3501
Page 1: Reprinting and copying, even in the
Page 5 and 6: Comments Description of Type of con
Page 7 and 8: Comments Description of Type of con
Page 9 and 10: Figure 1. Lowest permissible detail

Design of Outfit Elements in Ships for Fatigue Technical ... - EWF

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