Fatigue Design of Cast Steel Nodes in Offshore Structures Based on Research Data.

Ma, Ao; Sharp, J. V.

doi:10.1680/iwtme.1997.29774

Cited by 9 publications

(8 citation statements)

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“…In 1984, the first engineering of cast steel joints was demonstrated in the Conoco Viking platform in the North Sea . Subsequently, cast steel joints have a wide application in both ocean and bridge engineering.…”

Section: Introductionmentioning

confidence: 99%

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Han

Wang

2019

Fatigue Fract Eng Mat Struct

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Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel are investigated in simulated seawater. Fractography is performed by using scanning electron microscopy (SEM). The macroscale fracture surface and microstructure of the failed specimen are acquired including the crack initiation, crack propagation, and pitting evolution. The maximum cyclic stress (S) versus number of cycles to failure (N) curves is derived by three‐parameter fatigue curve method. Fatigue life is predominantly controlled by the corrosion pitting‐induced crack initiation when tested in simulated seawater at lower stress levels. As the maximum cyclic stress is less than 185 MPa, the chloride ion erosion is the main influence factor, which affects the fatigue failure of the G20Mn5QT cast steel in simulated seawater.

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Section: Introductionmentioning

confidence: 99%

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Han

Wang

2019

Fatigue Fract Eng Mat Struct

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“…Along with the casting process, especially during solidification of the steel, different casting defects occur. Former research [1][2][3] has shown a reduction in lifetime as these defects cause multiaxial stress fields and act as notches which could have the shape of sharp cracks. To which extend the positive or negative effects dominate the overall behavior is not quantified yet.…”

Section: Introductionmentioning

confidence: 99%

Influence of internal imperfections on the fatigue resistance of cast steel – testing methodology

Nagel¹,

Rauber

Veile

et al. 2019

MATEC Web Conf.

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Tensile fatigue specimen of G20Mn5 and G22NiMoCr5-6 were tested to quantify the influence of internal defects on the fatigue resistance of cast steel components. Defects with varying sizes, geometric shapes and distribution were enforced by influencing the solidification and recorded by computer tomography (CT). Besides the characteristics of the detected cavities, the surrounding fungoid microstructure is classified and evaluated. Later the specimens were tested under cyclic tension and S/N-curves are derived. These data form the basis for extensive numerical simulations of the damage process and the crack growth of every individual specimen. Both processes are affected by the local multiaxial stress states and have their origin in the inside of the specimen. For validation, knowledge of the crack initiation time and propagation properties are essential. Therefore, all specimens respectively the properties of the internal defects are monitored during testing with three different state-of-the-art non-destructive testing (NDT) methods. Background and application of these NDT techniques are described within this paper. Finally, fracture surface analyses show different failure modes and provide further information for model validation.

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“…Broughton et al examined the advantages of cast steel joints in terms of casting cost and fatigue performance based on an offshore oil platform structure [20]. Ma et al experimentally studied fatigue performance of cast steel joints [21] and focused primarily on the stress concentration, material S − N curves, and initial defects of the joints, and ultimately proposed design fatigue curves of the cast steel joints. de Oliveira et al from the Cast ConneX Corporation tested the cast steel joints used in the tube brace end [22].…”

Section: Introductionmentioning

confidence: 99%

Hysteretic Behavior of Beam‐to‐Column Joints with Cast Steel Connectors

Xue

Bao

Jiang

et al. 2019

Shock and Vibration

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This study proposed a beam-to-column joint equipped with a new type of cast steel connector. The cast steel connector concentrated the primary portion of the deformation and energy dissipation of the joint and was installed with full bolted connections, rendering it a replaceable energy dissipation component and facilitating the rapid repair of the joint after an earthquake. Three full-scale specimens were fabricated and tested to investigate the hysteretic behaviors of the proposed joints under cyclic loadings. The results showed that the proposed cast steel connector exhibited reliable ductility and energy dissipation capacity. The beam-to-column joints with cast steel connectors under appropriate configuration can limit the deformation to the cast steel connector and protect the remaining joint components from plastic deformation. A more detailed finite element analysis was performed to investigate the hysteretic behavior of the joint further. The FEM results illustrated that the thickness of the vertical leg of the cast steel connector can significantly influence the stiffness and bearing capacity of the joint. Meantime, it would improve the hysteretic behavior effectively. The proposed beam-to-column joints with cast steel connectors can achieve the requirement of stiffness and load-bearing capacity and can be widely applicable in practical engineering.

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Fatigue Design of Cast Steel Nodes in Offshore Structures Based on Research Data.

Cited by 9 publications

References 0 publications

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Corrosion fatigue behaviour and microstructural characterisation of G20Mn5QT cast steel in 3.5‐wt% NaCl solution

Influence of internal imperfections on the fatigue resistance of cast steel – testing methodology

Hysteretic Behavior of Beam‐to‐Column Joints with Cast Steel Connectors

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