Application of the modified Bai-Wierzbicki model for the prediction of ductile fracture in pipelines

Keim, V.; Nonn, Aida; Münstermann, Sebastian

doi:10.1016/j.ijpvp.2019.02.010

Cited by 16 publications

(4 citation statements)

References 37 publications

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“…Taking into consideration the studies published recently, in the case of ductile fracture, which is typical for S235JR steel, good agreement was observed in simulations conducted by using the Bai-Wierzbicki material model [33]. The results presented in [34,35] give us confidence for achieving a reliable result.…”

Section: Discussionsupporting

confidence: 64%

Modelling the Damage of Structural Components with Macrostructure Defects

Kossakowski

2019

Metals

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The article presents a numerical analysis of the process of damage of structural steel, the scope of which encompassed the estimation of the time to failure of a structural component. The analysis was conducted using the Gurson–Tvergaard–Needleman material model, which takes into account the influence of microdefects on material strength. Considered was a plate element with a central hole modelling the material discontinuity that may arise in a structural component as a result of corrosion. The conducted simulation permitted an analysis of the phenomenon of nucleation and evolution of microdamage in S235JR steel, which allowed, for the analysed component, the detection of the initiation of microdamages and their development in the area susceptible to damage. Changes to the state of stress taking place during plastic deformation of structural steel due to the evolution of microdefects of the material structure were analysed. Presented are the results of this research, in which the stress state described by the stress triaxiality in relation to the changes in the volumetric fraction of voids determining the size of microdefects was given a detailed analysis.

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Section: Discussionsupporting

confidence: 64%

Modelling the Damage of Structural Components with Macrostructure Defects

Kossakowski

2019

Metals

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“…Instead, it aims to describe the aggregative accumulation of the defects and their influence on the load bearing capabilities. For this step a plasticity model is no longer able to describe the materials mechanical behaviour (Keim et al 2019). For the non-proportional loading, two indicators have been applied to describe the ductile damage initiation I dd and ductile fracture I d f respectively to consider the effects of stress state evolution.…”

Section: Extension Of Mbw Model For Non-proportional Loading Paths (Npmbw-19)mentioning

confidence: 99%

The differences of damage initiation and accumulation of DP steels: a numerical and experimental analysis

et al. 2020

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Many studies have examined the damage behaviour of dual-phase steels already. It is a topic of high interest, since understanding the mechanisms of damage during forming processes enables the production of steels with improved properties and damage tolerance. However, the focus was rarely on the comparison between representatives of this steel class, and the numerical simulation for the quantification of damage states was not thoroughly used. Therefore, this study compares the damage initiation and accumulation of two dual-phase steels (DP800 and DP1000), which are used in the automotive industry. Additionally, parameter sets of a phenomenological damage mechanics model with coupled damage evolution are calibrated for each material. The combined analysis reveals an earlier initiation of damage for the DP800, where the damage accumulation phase is prolonged. For DP1000 the damage nucleates only shortly before material failure. The material model is able to correctly predict the behaviour, while experimental analysis confirms the prediction via light optical and SEM metallography.

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“…At the same time, relevant researchers conducted impact tests on pipelines and combined them with DWTT tests in an attempt to refect the true characteristics of materials under special conditions. Researchers found that improving the steel grade can enhance the material's ability of resist crack initiation and propagation, while the brittle fracture of pipeline cannot still be solved [10][11][12]. In foreign countries, DWTT tests had been carried out for the pipelines to explore the fracture toughness indicators and the shear fracture appearance of the sample corresponding to the wall thickness and pipeline material.…”

Section: Introductionmentioning

confidence: 99%

Research on Material Selection Method and Brittle Fracture Mechanism of High-Pressure Pipeline

Li,

2023

Shock and Vibration

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Aiming at the problem of the brittle fracture of pressure pipeline, the elastic constraint structure is described by using members and engineering building structures, and the concept of elastic constraint is proposed. Through the stress field analysis of the pressure pipeline under internal pressure, it is found that the pressure pipeline under internal pressure is an elastic constraint structure. The elastic constraint effect is applied to the pressure pipeline to explore the influence of elastic constraint effect on the brittle fracture of pressure pipeline. The critical wall thickness and limit load of different materials are calculated by the limit bearing formula. Through simulation analysis of materials with different yield ratios and pipelines with different wall thicknesses of the same material (yield ratio is the ratio of yield strength to tensile strength), it was found that pressure pipelines made of the same material have an increased load-bearing capacity as the wall thickness increases, but their own elastic constraint effects are becoming more obvious, and the probability of the brittle fracture of the pipeline is higher. When the wall thickness of pressure pipelines made of materials with different yield ratios is certain, the lower the yield ratio is, the more likely the pipeline is to generate plastic deformation and the larger the deformation capacity is; the higher the yield ratio, the poorer the plastic deformation capacity of the pipeline and the smaller the deformation capacity. Pipelines with large yield ratio are more sensitive to the brittle fracture than those with small yield ratio.

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Application of the modified Bai-Wierzbicki model for the prediction of ductile fracture in pipelines

Cited by 16 publications

References 37 publications

Modelling the Damage of Structural Components with Macrostructure Defects

Modelling the Damage of Structural Components with Macrostructure Defects

The differences of damage initiation and accumulation of DP steels: a numerical and experimental analysis

Research on Material Selection Method and Brittle Fracture Mechanism of High-Pressure Pipeline

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