The prediction of residual life of liquid-storage tank considering the tank wall surface state

Lai, Jiafeng; Wang, Yuhan; Wei, Yuwei; Liang, Jinlu; Liu, Xintian

doi:10.1108/ijsi-05-2022-0070

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…The Paris formula has a wide range of applications in the calculation of residual life. Lai et al 28 regarded surface roughness as an initial defect and obtained the residual life of liquid containers by modifying the Paris formula. There are inevitably many initial defects in the weld seam, so it is obviously reasonable to use the Paris formula to calculate its lifespan.…”

Section: Basic Theoriesmentioning

confidence: 99%

Probability life calculation model of beam element application and study in welded structures reliability analysis

LYu,

Wang,

Zhang

et al. 2023

Advances in Mechanical Engineering

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Statistical size and geometrical size are the main factors affecting the service life of mechanical structure calculation. To explore the reliability of the lifespan of beam structures, a probability lifespan numerical calculation method based on Vector Form Intrinsic Finite Element Method (VFIFEM) was proposed, and the method was verified through full lifespan experiments on I-beam welded structures. First, a fatigue fracture model that considers the coupling of residual stress (RS) and cyclic load variations was established. Based on this fatigue fracture model, a probability lifespan calculation model for beam elements was defined by proposing a cross-sectional shape correction coefficient and a position correction coefficient. The proposed probability lifespan model for beam elements was used to calculate the I-beam welded structure, and the calculated results were compared with the full lifespan experiment results, which were close in statistical results, with all experimental results falling within the [10%, 90%] interval except for one experiment. This method effectively couples the influence of statistical size and geometric size on probability lifespan, providing a new approach for the structure probability lifespan calculation in the future.

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Section: Basic Theoriesmentioning

confidence: 99%

Probability life calculation model of beam element application and study in welded structures reliability analysis

LYu,

Wang,

Zhang

et al. 2023

Advances in Mechanical Engineering

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“…14,15 Given the impact of stress on the stability and safety of engineering structures under load, it is important to conduct detailed studies on crack propagation. [16][17][18][19] This study investigated the mechanical properties of rocks with varying crack lengths and dip angles through indoor uniaxial compression tests. The results revealed the relationship between mechanical parameters and crack dip angles.…”

Section: (A) (B)mentioning

confidence: 99%

“…The extension of these cracks is related to the stress intensity factor (SIF) and can be studied through experimental, theoretical, and numerical methods, with analytical methods being widely used 14,15 . Given the impact of stress on the stability and safety of engineering structures under load, it is important to conduct detailed studies on crack propagation 16–19 . This study investigated the mechanical properties of rocks with varying crack lengths and dip angles through indoor uniaxial compression tests.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

Liu

Wang³

2023

Engineering Reports

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This study examines the mechanical properties and fracture modes of sandstone with single and double cracks under varying confining pressures through triaxial compression tests. The stress–strain curves, mechanical parameters, and fracture modes of both intact and cracked sandstone are analyzed based on experimental results. The study finds that the presence of cracks has a significant impact on the mechanical properties of sandstone, with greater damage observed with an increase in the number of cracks. The peak strength and strain of a cracked rock sample increase with the increase in crack angle. The fracture mode of sandstone is influenced by both crack angle and confining pressure. When the crack angle is small, the fracture mode is a combination of shear and tensile failure, while a large crack angle results in shear failure. Moreover, as the confining pressure increases, the degree of damage to the sandstone also increases.

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Empirical modeling of stress concentration factors using artificial neural networks for fatigue design of tubular T-joint under in-plane and out-of-Plane bending moments

Rasul,

Karuppanan,

Perumal

et al. 2024

IJSI

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PurposeStress concentration factors (SCFs) are commonly used to assess the fatigue life of tubular T-joints in offshore structures. SCFs are usually estimated from parametric equations derived from experimental data and finite element analysis (FEA). However, these equations provide the SCF at the crown and saddle points of tubular T-joints only, while peak SCF might occur anywhere along the brace. Using the SCF at the crown and saddle can lead to inaccurate hotspot stress and fatigue life estimates. There are no equations available for calculating the SCF along the T-joint's brace axis under in-plane and out-of-plane bending moments.Design/methodology/approachIn this work, parametric equations for estimating SCFs are developed based on the training weights and biases of an artificial neural network (ANN), as ANNs are capable of representing complex correlations. 1,250 finite element simulations for tubular T-joints with varying dimensions subjected to in-plane bending moments and out-of-plane bending moments were conducted to obtain the corresponding SCFs for training the ANN.FindingsThe ANN was subsequently used to obtain equations to calculate the SCFs based on dimensionless parameters (α, β, γ and τ). The equations can predict the SCF around the T-joint's brace axis with an error of less than 8% and a root mean square error (RMSE) of less than 0.05.Originality/valueAccurate SCF estimation for determining the fatigue life of offshore structures reduces the risks associated with fatigue failure while ensuring their durability and dependability. The current study provides a systematic approach for calculating the stress distribution at the weld toe and SCF in T-joints using FEA and ANN, as ANNs are better at approximating complex phenomena than typical data fitting techniques. Having a database of parametric equations enables fast estimation of SCFs, as opposed to costly testing and time-consuming FEA.

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The prediction of residual life of liquid-storage tank considering the tank wall surface state

Cited by 3 publications

References 28 publications

Probability life calculation model of beam element application and study in welded structures reliability analysis

Probability life calculation model of beam element application and study in welded structures reliability analysis

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

Empirical modeling of stress concentration factors using artificial neural networks for fatigue design of tubular T-joint under in-plane and out-of-Plane bending moments

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