Micromechanical Analysis of In-Plane Constraint Effect on Local Fracture Behavior of Cracks in the Weakest Locations of Dissimilar Metal Welded Joint

Yang, Jie

doi:10.1007/s40195-017-0599-y

Cited by 21 publications

(13 citation statements)

References 29 publications

(47 reference statements)

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“…To obtain the fracture resistance curves and crack propagation paths of different strength mismatched laboratory specimens under various material constraints, the finite element method (FEM) simulation based on Gurson-Tvergaard-Needleman (GTN) damage model was used to simulate the progress of crack growth in the specimens. There are nine parameters in the GTN damage model, and these parameters of the four materials have been obtained and verified, as shown in Table 1 [27]. The GTN damage model has been implemented in the ABAQUS code.…”

Section: Gtn Damage Modelmentioning

confidence: 99%

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Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

2020

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Different strength mismatched laboratory specimens that contain the compact tension (CT), single edge-notched tensile (SENT), and central-cracked tension (CCT) specimens with various specimen geometries, loading configurations, and initial cracks were selected to investigate the effect range of the material constraint systematically. The results showed that the effect range of material constraint exists in all the strength mismatched specimens and structures. The numerical value of the effect range is influenced by the geometry constraint. The high geometry constraint reduces the effect range of material constraint. When a material is located outside the effect range of material constraint, the fracture resistance curves and crack propagation paths of the specimens and structures are no longer influenced by the mechanical properties of the material. In addition, an interaction exists between the geometry constraint and material constraint. The high geometry constraint strengthens the effect of material constraint, whereas the fracture resistance curve and crack propagation path are insensitive to the material constraint under the low geometry constraint. The results in this study may provide scientific support for the structure integrity assessment and the design of strength mismatched structures.

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Section: Gtn Damage Modelmentioning

confidence: 99%

“…Table 1. The nine Gurson-Tvergaard-Needleman (GTN) damage parameters of the four materials in the DMWJ [27]. The GTN damage model has been implemented in the ABAQUS code.…”

Section: Gtn Damage Modelmentioning

confidence: 99%

Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

2020

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“…These parameters have been obtained and listed in Table 1. 22 This GTN damage model has been implemented in the ABAQUS code and has been widely used to simulate the crack propagation process and calculate the J-resistance curve. The load versus load-line displacement curve can be obtained from the FEM simulations.…”

Section: Gtn Modelmentioning

confidence: 99%

An optimal design of the widths of heat affect zone, fusion zone, and near interface zone in a dissimilar metal welded joint

Guo

Yang

Wang

et al. 2019

Mat Design & Process Comms

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The optimal design of the dissimilar metal welded joint is a valuable research issue, whether optimize the material, processing technology, dimension, or anything else. The fracture behavior of the dissimilar metal welded joint have been found affected by the widths of heat affect zone, fusion zone, and near interface zone. In this study, the optimal design of the widths of heat affect zone, fusion zone, and near interface zone in the dissimilar metal welded joint was further studied systematically. Firstly, a dissimilar metal welded joint, which used in the nuclear power plants with either heat affect zone crack or fusion zone crack, was selected, and a width mismatch coefficient M W was defined. In addition, the crack propagation paths and J-resistance curves of the dissimilar metal welded joints under different M W induced by the widths of heat affect zone, fusion zone, and near interface zone were calculated. Based on the obtained results, the widths of heat affect zone, fusion zone, and near interface zone were optimized. This study will provide support for the design of the dissimilar metal welded joint and is significant to the structure integrity assessment of the nuclear power plants.

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“…Generally, the GTN model has nine parameters: the constitutive parameters q 1 , q 2 , and q 3 , the void nucleation parameters f N , ε N , and S N , the initial void volume fraction f 0 , the critical void volume fraction f C and the final failure parameter f F , which have been listed in the Table 1 [32]. Table 1.…”

Section: Gtn Damage Modelmentioning

confidence: 99%

“…Table 1. The GTN (Gurson-Tvergaard-Needleman) parameters of different material zones [32]. The finite element code ABAQUS was selected in this study.…”

Section: Gtn Damage Modelmentioning

confidence: 99%

Optimizing the Local Strength Mismatch of a Dissimilar Metal Welded Joint in a Nuclear Power Plant

Yang

Wang

2018

Metals

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Local strength mismatch is one of the important factors which affects the fracture behavior of a dissimilar metal welded joint (DMWJ). The question to consider is how to improve the fracture resistance of the DMWJ effectively by optimizing the local strength mismatch. In this paper, a DMWJ in a nuclear power plant was selected, the J-resistance (J-R) curve and crack growth path of the DMWJ under different strength mismatches of heat affect zone (HAZ), fusion zone (FZ), and near interface zone (NIZ) were systemically studied. And then, the optimal design of the local strength mismatch was investigated. The results show that decreasing the strength of HAZ and NIZ and increasing the strength of FZ will increase the fracture resistance of a DMWJ. Increasing the strength of FZ increases the J-R curve obviously. When the M s (HAZ):M s (FZ):M s (NIZ) = 1.12:1.4:1.26 and M s (HAZ):M s (FZ):M s (NIZ) = 1:1.4:1, the DMWJs have the highest J-R curves. Considering that the two J-R curves are similar, it is suggested that the fracture resistance of the DMWJ can be improved only by increasing the strength of the FZ.

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Micromechanical Analysis of In-Plane Constraint Effect on Local Fracture Behavior of Cracks in the Weakest Locations of Dissimilar Metal Welded Joint

Cited by 21 publications

References 29 publications

Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

An optimal design of the widths of heat affect zone, fusion zone, and near interface zone in a dissimilar metal welded joint

Optimizing the Local Strength Mismatch of a Dissimilar Metal Welded Joint in a Nuclear Power Plant

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