Review of Fatigue Assessment Approaches for Welded Marine Joints and Structures

Corigliano, Pasqualino; Crupi, Vincenzo

doi:10.3390/met12061010

Cited by 14 publications

(15 citation statements)

References 149 publications

(259 reference statements)

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“…where t is the plate thickness, f y' and m x' are the line force and line moment, respectively. Equation (1) deduces equation (2).…”

Section: The Structural Stress Methodsmentioning

confidence: 99%

“…In welded structures, fatigue failures predominantly occur at welded joints. 1,2 In order to ensure the fatigue safety of welded structures, it is absolutely essential to study and understand the fatigue stability and reliability evolution law of welded joints during long-term service. However, the reliability assessment of welded joints based on fatigue phenomena is a difficult task because it is influenced by many factors (such as weld leg size, plate thickness, and penetration depth) and the relationships between them are complex.…”

Section: Introductionmentioning

confidence: 99%

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A fatigue reliability assessment model for welded structures based on the structural stress method

Zhou

Hao

Liang

et al. 2023

Advances in Mechanical Engineering

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Since many factors affect the fatigue life of welded structures and the relationships between them are complex, finding effective ways to improve the fatigue reliability of welded structures has always been a challenge for the industry. A fatigue reliability assessment model and design method for welded structures based on the structural stress method is proposed. According to the limit state equation of the model, the design-life fatigue reliability and the service fatigue reliability assessment approaches are presented. Then, a first-order second-moment method is employed to reveal quantitative fatigue reliability for welded joints and structures. The relationships between the fatigue reliability and the influence variables are used to analyze and improve the welded structure design. Fatigue reliability of T-joint examples was assessed by accounting for weld leg sizes, plate thicknesses, penetration depths, and single-sided and double-sided forms. Furthermore, the assessment model was verified with a welded bogie frame. The fatigue reliability of the frame was improved based on the evaluation results. The model and method can be applied to other types of welded joints and welded structures.

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“…where t is the plate thickness, f y' and m x' are the line force and line moment, respectively. Equation (1) deduces equation (2).…”

Section: The Structural Stress Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A fatigue reliability assessment model for welded structures based on the structural stress method

Zhou

Hao

Liang

et al. 2023

Advances in Mechanical Engineering

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show abstract

“…In the shipbuilding and marine industries, the size of the steel structure has increased rapidly in recent years [1], and the time for welding thick steel plates can account for approximately 50% of the total construction time. To improve welding efficiency, high heat input welding methods have been widely used to weld thick steel plates for marine applications [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Parameterized Leblond–Devaux Equation for Predicting Phase Evolution during Welding E36 and E36Nb Marine Steels

El-Fallah

Qing

et al. 2023

Materials

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High heat input welding can improve welding efficiency, but the impact toughness of the heat-affected zone (HAZ) deteriorates significantly. Thermal evolution in HAZ during welding is the key factor affecting welded joints’ microstructures and mechanical properties. In this study, the Leblond–Devaux equation for predicting phase evolution during the welding of marine steels was parameterized. In experiments, E36 and E36Nb samples were cooled down at different rates from 0.5 to 75 °C/s; the obtained thermal and phase evolution data were used to construct continuous cooling transformation diagrams, which were used to derive the temperature-dependent parameters in the Leblond–Devaux equation. The equation was then used to predict phase evolution during the welding of E36 and E36Nb; the quantitative experimental phase fractions of the coarse grain zone were compared with simulated results to verify the prediction results, which are in good agreement. When heat input is 100 kJ/cm, phases in the HAZ of E36Nb are primarily granular bainite, whereas for E36, the phases are mainly bainite with acicular ferrite. When heat input increases to 250 kJ/cm, ferrite and pearlite form in both steels. The predictions agree with experimental observations.

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“…Three approaches are generally employed for fatigue analysis of tubular joints: experimental, fracture mechanics (FM)-based, and S-N curves-based. 1,2 Experimental investigations are usually costly and time-consuming. It is a standard procedure to use limited experimentation to validate numerical models and use the numerical model for further investigations.…”

Section: Introductionmentioning

confidence: 99%

“…Three approaches are generally employed for fatigue analysis of tubular joints: experimental, fracture mechanics (FM)‐based, and S–N curves‐based 1,2 . Experimental investigations are usually costly and time‐consuming.…”

Section: Introductionmentioning

confidence: 99%

Empirical modeling of stress concentration factors using finite element analysis and artificial neural networks for the fatigue design of tubular KT‐joints under combined loading

Iqbal,

Karuppanan,

Perumal

et al. 2023

Fatigue Fract Eng Mat Struct

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The hotspot stress (HSS) approach for the fatigue design of tubular joints requires that peak HSS be known. Peak HSS in tubular joints is usually determined based on the stress concentration factor (SCF) estimated from empirical models developed through extensive experimental investigations and finite element analysis. While peak HSS usually occurs at a KT‐joint's crown and saddle points, its location may change if the tubular joint is subjected to a combination of axial, in‐plane bending, or out‐of‐plane bending loads. This study investigated the peak HSS and its location in a typical KT‐joint subjected to the combined loading. Specifically, empirical models to determine the SCF around the brace axis have been developed using extensive finite element analysis and artificial neural networks (ANN) simulations. Less than 3% error was noticed between peak HSS determined through developed models and FEA. Hence, the ANN‐based SCF equations and principle of superposition can be used to calculate peak HSS rapidly for fatigue design of tubular joints. This methodology is applicable for developing empirical models for SCF in other tubular joints and boundary conditions.

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Review of Fatigue Assessment Approaches for Welded Marine Joints and Structures

Cited by 14 publications

References 149 publications

A fatigue reliability assessment model for welded structures based on the structural stress method

A fatigue reliability assessment model for welded structures based on the structural stress method

A Parameterized Leblond–Devaux Equation for Predicting Phase Evolution during Welding E36 and E36Nb Marine Steels

Empirical modeling of stress concentration factors using finite element analysis and artificial neural networks for the fatigue design of tubular KT‐joints under combined loading

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