Development of GTN Model Parameters for Simulating Ductile Fracture Behavior of X 70 Carbon Steel SENT Specimens

Yoon, Sung Ho; Ryu, Tae-Young; Kim, Moon Ki; Choi, Jae-Boong; Kim, Ik-Joong

doi:10.1115/pvp2019-93542

Cited by 3 publications

(2 citation statements)

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“…To the best of the authors' knowledge, SENT and SENB tests which have pre-existing cracks have never been simulated using the J-C model in literature. However, the SENT test has been simulated in FEM using the Gurson-Tvergaard-Needleman (GTN) model and a very fine mesh size around the pre-existing crack was used [46][47][48].…”

Section: Resultsmentioning

confidence: 99%

A Unified Fracture Model for X65 Pipeline Material Under Various Constraints Using the Extended Finite Element Method (XFEM)

Shahzamanian

2024

Journal of Pressure Vessel Technology

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It is generally accepted that the fracture strain is dependent on geometry/constraints in metals. However, the current available implementation of XFEM assumes a fixed fracture strain criterion independent of the constraints. The objective of this paper is to develop and implement a variable fracture strain criterion in XFEM that is capable of predicting a wide range of fracture conditions in X65 pipeline steels with various crack tip constraints. Various small-scale tests with different out of plane constraints obtained from the literature were simulated using the XFEM in ABAQUS software. For each test, the value of the maximum principal strain (Maxpe) as a fracture initiation criterion in the cohesive zone model (CZM) in XFEM framework was varied while keeping the fracture energy constant until the model was able to accurately replicate the reported experimental results. For each test, the crack tip constraints were characterized and the stress triaxialities and Lode angle parameters at the onset of fracture initiation were calculated from the models. The results allowed expressing the fracture strain as an explicit function of stress triaxiality which was then implemented in ABAQUS XFEM using UDMGINI subroutine. For the sake of comparison, the tests were simulated in finite element method (FEM) using a similar damage initiation model namely, the Johnson-Cook (J-C) model. A single model in XFEM was able to accurately replicate the experimental observations for all specimens and compared well to experiments in the way simulated by FEM damage model.

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Section: Resultsmentioning

confidence: 99%

A Unified Fracture Model for X65 Pipeline Material Under Various Constraints Using the Extended Finite Element Method (XFEM)

Shahzamanian

2024

Journal of Pressure Vessel Technology

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“…For X70 pipeline steel, there is a lack of comprehensive and systematic analysis of factors influencing the results of Charpy impact testing; so the corresponding damage models can be validated and / or calibrated to be implemented in more complex simulations. The Gurson-Tvergaard-Needleman (GTN) [7] damage model is well-known and widely applied and it is used to simulate dynamic ductility fracture propagation [8]. Due to the limited parameter set in this model, it is often adopted in the industry field.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of the GTN damage parameters at different temperature for dynamic fracture propagation in X70 pipeline steel using neural network

Ouladbrahim

Belaidi

Khatir

et al. 2021

Frattura Ed Integrità Strutturale

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In this paper, the initial and maximum load was studied using the Finite Element Modeling (FEM) analysis during impact testing (CVN) of pipeline X70 steel. The Gurson-Tvergaard-Needleman (GTN) constitutive model has been used to simulate the growth of voids during deformation of pipeline steel at different temperatures. FEM simulations results used to study the sensitivity of the initial and maximum load with GTN parameters values proposed and the variation of temperatures. Finally, the applied artificial neural network (ANN) is used to predict the initial and maximum load for a given set of damage parameters X70 steel at different temperatures, based on the results obtained, the neural network is able to provide a satisfactory approximation of the load initiation and load maximum in impact testing of X70 Steel.

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A unified fracture model for X65 pipeline material under various constraints using the eXtended finite element method (XFEM)

Sichani

2022

Preprint

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It is generally accepted that the fracture strain is dependent on geometry/constraints in metals. However, the current available implementation of XFEM assumes a fixed fracture strain criterion independent of the constraints. The objective of this paper is to develop and implement a variable fracture strain criterion in XFEM that is capable of predicting a wide range of fracture conditions in X65 pipeline steels with various crack tip constraints. Various small-scale tests with different out of plane constraints obtained from the literature were simulated using the XFEM in ABAQUS software. These tests included smooth bar, notched bar, single edge notch tension (SENT), and single edge notch bending (SENB) tests. For each test, the value of the maximum principal strain (Maxpe) as a fracture initiation criterion in the cohesive zone model (CZM) in XFEM framework was varied while keeping the fracture energy constant until the model was able to accurately replicate the reported experimental results. For each test, the crack tip constraints were characterized and the stress triaxialities and Lode angle parameters at the onset of fracture initiation were calculated from the models. The results allowed expressing the fracture strain as an explicit function of stress triaxiality which was then implemented in ABAQUS XFEM using UDMGINI subroutine. For the sake of comparison, the tests were simulated in finite element method (FEM) using a similar damage initiation model namely, the Johnson-Cook (J-C) model. A single model in XFEM was able to accurately replicate the experimental observations for all specimens and compared well to experiments in the way simulated by FEM damage model. However, it was observed that XFEM was more suitable to simulate specimens with pre-existing cracks such as in SENT and SENB tests since the crack grew through elements when mesh refinement was not required around the crack tips. Lastly, the simulated results were found to be less mesh sensitive in XFEM than in FEM damage models.

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Development of GTN Model Parameters for Simulating Ductile Fracture Behavior of X 70 Carbon Steel SENT Specimens

Cited by 3 publications

References 0 publications

A Unified Fracture Model for X65 Pipeline Material Under Various Constraints Using the Extended Finite Element Method (XFEM)

A Unified Fracture Model for X65 Pipeline Material Under Various Constraints Using the Extended Finite Element Method (XFEM)

Sensitivity analysis of the GTN damage parameters at different temperature for dynamic fracture propagation in X70 pipeline steel using neural network

A unified fracture model for X65 pipeline material under various constraints using the eXtended finite element method (XFEM)

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