A Fracture Strain Based Numerical Prediction Method For Hydrogen Effect on Fracture Toughness

Youn, Gyo-Geun; Kim, Yun-Jae; Kim, Jong Sung; Lam, Poh-Sang

doi:10.1016/j.ijmecsci.2021.106492

Cited by 8 publications

(8 citation statements)

References 45 publications

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“…An important aspect of hydrogen diffusion is the increased diffusion towards regions of high hydrostatic stress, such as crack tips [ 18 ]. Previous studies have neglected this aspect in their continuum models [ 19 , 20 , 21 ], which is only acceptable when the loading rate is large enough compared to the diffusion coefficient [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…Damage accumulates upon plastic straining, and when this accumulation exceeds a critical value, the element loses its stiffness. Accelerated damage evolution due to hydrogen in these fracture strain models is incorporated through a reduction of the fracture locus with increasing hydrogen concentration [ 12 , 19 , 21 , 22 , 23 ]. Typically, only a single specimen geometry and, thus, a single stress triaxiality, is used for calibrating the degradation parameter [ 12 , 19 , 21 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Accelerated damage evolution due to hydrogen in these fracture strain models is incorporated through a reduction of the fracture locus with increasing hydrogen concentration [ 12 , 19 , 21 , 22 , 23 ]. Typically, only a single specimen geometry and, thus, a single stress triaxiality, is used for calibrating the degradation parameter [ 12 , 19 , 21 , 23 ]. Most authors introduce a multiplier of the fracture locus [ 21 , 22 , 23 ]; hence, the detrimental effect of hydrogen on the mechanical properties is independent of the stress triaxiality.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, only a single specimen geometry and, thus, a single stress triaxiality, is used for calibrating the degradation parameter [ 12 , 19 , 21 , 23 ]. Most authors introduce a multiplier of the fracture locus [ 21 , 22 , 23 ]; hence, the detrimental effect of hydrogen on the mechanical properties is independent of the stress triaxiality. However, multiple experimental studies suggest that embrittlement can increase for increasing stress triaxiality [ 24 , 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model

et al. 2023

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Hydrogen can degrade the mechanical properties of steel components, which is commonly referred to as “hydrogen embrittlement” (HE). Quantifying the effect of HE on the structural integrity of components and structures remains challenging. The authors investigated an X70 pipeline steel through uncharged and hydrogen-charged (notched) tensile tests. This paper presents a combination of experimental results and numerical simulations using a micro-mechanics-inspired damage model. Four specimen geometries and three hydrogen concentrations (including uncharged) were targeted, which allowed for the construction of a fracture locus that depended on the stress triaxiality and hydrogen concentration. The multi-physical finite element model includes hydrogen diffusion and damage on the basis of the complete Gurson model. Hydrogen-Assisted degradation was implemented through an acceleration of the void nucleation process, as supported by experimental observations. The damage parameters were determined through inverse analysis, and the numerical results were in good agreement with the experimental data. The presented model couples micro-mechanical with macro-mechanical results and makes it possible to evaluate the damage evolution during hydrogen-charged mechanical tests. In particular, the well-known ductility loss due to hydrogen was captured well in the form of embrittlement indices for the different geometries and hydrogen concentrations. The limitations of the damage model regarding the stress state are discussed in this paper.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model

et al. 2023

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“…First, the non‐integral‐type parameters, which are widely applied to deal with the issues during elastic–plastic crack extension, are discussed in detail. Typically, they are composed of the crack tip opening angle (CTOA), 20 the crack tip opening distance (CTOD), 21 fracture strain, 22 the energy dissipation rate, 23 and the essential work of fracture (EWF) 24 . Concretely, CTOA represents the local inclination of crack surfaces in the vicinity of the crack tip, and a crack extends once the defined CTOA reaches its critical value.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the correlation between critical storage of elastic strain energy and crack extension in elastic–plastic materials

Chang

Yang

Liu

et al. 2022

Fatigue Fract Eng Mat Struct

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To better solve the issues of steady crack extension with broad plasticity and the crack-related problems in general yielding situations when the assumption of small-scale plastic yielding fails, it is of great significance to further study the macroscopic mechanism of crack extension. In this paper, a new insight into the elastic-plastic crack extension is proposed on the foundation of critical storage of elastic strain energy (SESE). The feasibility of the new methodology is validated by designing and implementing two different experimental schemes in three typical elastic-plastic materials. The experimental results indicate that the critical SESE decreases linearly with the increase of crack length and U-notch initial length. Besides, the SESE release rate is obtained through experimental and theoretical methods, and they are in the same order of magnitude and their value sequences are also accordant with all tested materials. Therefore, this investigation provides a new approach to characterizing crack extension in elastic-plastic materials.

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Enhanced hydrogen embrittlement of steel by the premature hydrogen dissociation with the increasing inert gas pressure in hydrogen-containing mixtures

Shang,

Hua,

Xing

et al. 2023

Acta Materialia

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A Fracture Strain Based Numerical Prediction Method For Hydrogen Effect on Fracture Toughness

Cited by 8 publications

References 45 publications

Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model

Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model

Experimental investigation on the correlation between critical storage of elastic strain energy and crack extension in elastic–plastic materials

Enhanced hydrogen embrittlement of steel by the premature hydrogen dissociation with the increasing inert gas pressure in hydrogen-containing mixtures

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