To cite this article: Cesare Mario Rizzo & Wolfgang Fricke ( ): Fatigue assessment of bulb stiffener joints according to local approaches, Ships and Offshore Structures, 8:1, 73-83

Bi-directional Stiffener Welder • Welds flat, angle, tee, and bulb type stiffener configurations. • Fillets up to 5/16 inch (8 mm). • Weld speeds up to 70 IPM (1778 mm). • Achieve high quality, uniform, continuous or intermittent welds on both sides of the stiffeners simultaneously. • The machine can be equipped with various weld

Download scientific diagram | Midship section with bulb plate stiffeners replaced with Y-stiffeners in the deck structure from publication: A New Quantitative Fatigue Life Assessment using

with other stiffeners such as flat bars or structural angles. • The compact shape of a bulb flat offers easy access for welding and painting. • The asymmetric bulb flat shape lends itself to simplified collar connection when compared to alternative stiffeners such as 'T's and angles. • The rounded profile of a bulb flat,

Bulb flats are tailor made for plate stiffening applications. Their special shape provides significant benefits compared with other types of stiffener.

2 Buckling Capacity of Plates and Stiffeners. 2.1 Overall stiffened panel capacity. 2.1.1 The elastic stiffened panel limit state is based on the following interaction formula: where cf and Pz are defined in [2.3.4]. 2.2 Plate capacity. 2.2.1 Plate limit state The plate limit state is based on the following interaction formulae:

For plating with longitudinal stiffeners (parallel to compressive stress): 1.10 when stiffeners are bulb flats, for angles and bulb profiles.

An improved composite stiffener and methods and tooling used to form the same. The stiffener includes one or more base flanges, a composite rod extending in an axial direction, a bulb cap

It maintains the flap's natural airfoil shape by eliminating the unsightly bulb and resultant drag found on common trailing edge stiffeners.

Stiffener End Details - Family No. 11 Panel Stiffener Details - Family No. 12 Summary of Ships Surveyed Revised Classification of Details Sample Calculation: Built-Up Beam Bracket in Way of Bulkhead Stiffener Fabrication Time Versus Size of Members Sample Calculation: Plate Corner Bracket Sample Calculation: Non-Tight Collar 3-13 3-15 3-17 3-18

Paint also adheres better to the rounded shapes of bulb stiffeners than the sharp corners of angle stiffeners, with prudent owners specifying that all sharp corners of angle stiffeners be

An improved composite stiffener and methods and tooling used to form the same. The stiffener includes one or more base flanges, a composite rod extending in an axial direction, a bulb cap surrounding the composite rod, and an upright web extending from the one or more base flanges to the base cap. The upright web includes a non-linear profile in the axial direction providing

Firstly, in terms of plate stiffening, bulb flat bars are a great solution for plate stiffening. Bulb flats provide a low paint area, with no need for edge grinding prior to painting and require fewer

PDF | Stiffener end connections, particularly at side longitudinals, belong to fatigue critical details of ship structures.

with bulb-flanges can be used instead of other harder-to-produce and assemble sections like Hat- or Tee-stiffeners which have served the industry favorably for decades. Figure 1 illustrates the general cross-section of a bulb-flange as opposed to a regular Tee and I cross-section. Asymmetric bulb-flanges are preferred for the following reasons.

The subject of this research is the buckling behavior of a rectangular plate, with a bulb flat stiffener attached to one side of the plate. The stiffener cross section has a thin web and a bulb

An improved composite stiffener and methods and tooling used to form the same. The stiffener includes one or more base flanges, a composite rod extending in an axial direction, a bulb cap surrounding the composite rod, and an upright web extending from the one or more base flanges to the base cap. The upright web includes a non-linear profile in the axial direction providing

Bulb flats are the most cost-effective, efficient and corrosion-resistant solution for plate stiffening requirements. Key advantages include an excellent strength to weight ratio delivering buckling resistance at a lower weight than with flat bars or angles.

This paper describes fatigue tests at stiffener end connections with bulb flats and angle bars and focuses on the question how far bulb flats are also prone to fatigue in view of the reduced

An investigation of the fatigue strength of three bulb plate stiffener joints is discussed. In addition to the usual joint with completely welded bulb, two further configurations are considered: one having a weakened bulb and another one having extra reinforcement to compensate for the unwelded bulb. The fatigue life for the usual and for the

Size b. (mm) t. (mm) c. (mm) r. (mm) Section. (cm²) Metric. Weight. (kg/m) Surface. A 60 x 4 60 ±1,5 4 +0,7 / ‑0,3 13 3.5 3.58 2.81 0.146 60 x 5 60 ±1,5 5 +0,7 / ‑0,3 13 3.5 4.18 3.28 0.148 60 x 6 60 ±1,5 6 +0,7 / ‑0,3 13 3.5 4.78 3.75 0.150