Numerical studies on crack growth in a steel tubular T-joint

Olowokere, David; Nwosu, D. I.

doi:10.1016/s0020-7403(96)00087-2

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…Olowokere and Nwosu [11] demonstrated that the crack propagation life estimated using the Paris law with numerically computed stress-intensity factors (SIFs) using spring elements agreed well with the experimental results obtained from cracked tubular T-joints subjected to axial loads and brace in-plane bending. Wallbrink et al [12] extended the prediction on the fatigue and crack shape evolution based on Paris law to complex tubular joints after confirming their approach on flat plate specimens.…”

Section: Introductionsupporting

confidence: 63%

Fatigue performance of tubular X-joints with PJP+ welds: II — Numerical investigation

Qian

Nguyen

Petchdemaneengam

et al. 2013

Journal of Constructional Steel Research

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Section: Introductionsupporting

confidence: 63%

Fatigue performance of tubular X-joints with PJP+ welds: II — Numerical investigation

Qian

Nguyen

Petchdemaneengam

et al. 2013

Journal of Constructional Steel Research

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“…The last three decades observed substantial development in fatigue assessment for welded tubular connections widely adopted in offshore structures, 2–11 which experience significant cyclic actions caused by winds, waves, and currents. These investigations focus on typically thin‐walled tubular joints for fixed‐type jacket platforms, with the chord outer radius over the chord wall thickness ratio γ= d 0 /2 t 0 ≥ 15.…”

Section: Introductionmentioning

confidence: 99%

“…Accurate estimations on the mixed-mode stress-intensity factors (SIFs) along the front of these initial cracks enable reliable predictions on the remaining fatigue life of these V-joints. The last three decades observed substantial development in fatigue assessment for welded tubular connections widely adopted in offshore structures, [2][3][4][5][6][7][8][9][10][11] which experience significant cyclic actions caused by winds, waves, and currents. These investigations focus on typically thin-walled tubular joints for fixed-type jacket platforms, with the chord outer radius over the chord wall thickness ratio γ = d 0 /2t 0 ≥ 15.…”

Section: Introductionmentioning

confidence: 99%

Stress‐intensity factors for circular hollow section V‐joints with a rack‐plate chord

Qian

2009

Fatigue Fract Eng Mat Struct

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A B S T R A C TThis study investigates the fatigue crack-driving force, measured by the linear-elastic stress-intensity factors (SIFs), for a surface crack at the root of the welds in a thick-walled, circular hollow section (CHS) V-shape joint, typically installed in modern offshore jack-up platforms. The primary (chord) member of the V-joint consists of two half CHSs welded to both sides of a thick rack plate, while the secondary (brace) member adopts thickwalled CHSs. The surface-breaking crack considered in this study locates at the interface between the rack plate and the weld metal joining the half CHS, and represents an initial flaw introduced by lack of penetration in the welding procedure. The finite-element model incorporates a very detailed, local crack-front mesh in a global continuous mesh through a mesh-tying procedure, which ensures displacement continuity between the independent master surface and the dependent slave surface. A simple plate model verifies the mesh-tying procedure in computing the linear-elastic stress-intensity factors for two remote loading conditions. The computation of the stress-intensity factors employs a linear-elastic interaction integral approach. The comparison of the computed SIF values with a previous experimental measurement for a CHS T-joint verifies the accuracy and feasibility of the interaction integral approach in computing SIF values for surface cracks in welded tubular connections. Subsequent numerical analysis on the gapped V-joints examines the mixed-mode SIF values for different loading conditions and includes an array of practical joint geometric parameters and crack sizes. The nondimensional mode I stress-intensity factors (K I /σ br √ πa) generally increases with the following variations in the joint geometric parameters: an increase in the chord radius to the wall thickness ratio (γ = d 0 /2t 0 ), an increase in the brace diameter to the chord diameter ratio (β = d 1 /d 0 ), a decrease in the crack depth ratio (a/t) or an increase in the crack length c. The current study identifies a practical group of V-joints that requires detailed treatment in the fatigue assessment procedure. These V-joints adopt a large β ratio and demonstrate high mode-mixity angles [ψ = tan −1 (K II /K I )] with correspondingly high mode I and mode II stress-intensity factors.

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“…Isto leva a plástico ou a previsão da vida útil da estrutura. uma perda parcial da capacidade resistente da Uma alternativa para este tipo de problema e a estrutura, sem no entanto, levá-la a um colapso utilização do modelo de linha de molas (MLM), que instantâneo, pois a parte remanescente da seção foi proposto por Rice & Levy (1972 Desvaux, 1985;Souza & Ebecken, 1987; seu desenvoivimento (Rice, 1973;Delale & Erdogan, Souza, 1993;Olowokere, 1997;Skallured, 1999).…”

unclassified

Shellfrat - Um sistema computacional para análise de trincas não passantes em estruturas de superfície.

Souza

Ebecken

2000

Semina: Tech. Ex.

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Numerical studies on crack growth in a steel tubular T-joint

Cited by 8 publications

References 5 publications

Fatigue performance of tubular X-joints with PJP+ welds: II — Numerical investigation

Fatigue performance of tubular X-joints with PJP+ welds: II — Numerical investigation

Stress‐intensity factors for circular hollow section V‐joints with a rack‐plate chord

Shellfrat - Um sistema computacional para análise de trincas não passantes em estruturas de superfície.

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