Charpy impact test on A508-3 steel after neutron irradiation

Lin, Yun; Yang, Wen; Tong, Zhao; Zhang, Changyi; Ning, Guangsheng

doi:10.1016/j.engfailanal.2017.06.032

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…For the sample support, all directions are constrained, whereas the sample is not constrained. For the punch and the sample, the motion contact is set between the sample and the support, and the friction coefficient is 0.2 [27]. The mesh (5) division is shown in Figure 2(b), the mesh is refined at the contact position on the sample.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Nonlinear Impact Damage Evolution of Charpy Type and Analysis of Its Key Influencing Factors

Mao,

Xu,

Yang

et al. 2024

Chin. J. Mech. Eng.

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The current research of Charpy impact mainly focuses on obtaining the ductile brittle transition temperature of materials by experiments. Compared with experiments, numerical simulation can study many problems with harsh conditions. However, there are still few studies on the influence of geometric factors such as side grooves. In this paper, the geometry of standard Charpy impact test is designed. Specimens with different widths and side grooves are tested. The finite element model of Charpy impact was established by ABAQUS software. Use test results and simulation results to verify each other. The effects of sample width, side groove depth and side groove bottom fillet on the impact fracture resistance of the sample were studied. The results show that the specimen width is positively correlated with the impact toughness of the specimen. The side groove greatly reduces the impact toughness of the material; the toughness of side groove decreases with the increase of depth; the fracture toughness of side groove decreases with the increase of fillet at the bottom of side groove. The proportion of toughness energy to impact energy of samples was analyzed. The results show that the toughness energy accounts for about 70% of the impact energy of the sample, which has little to do with the geometric characteristics of the sample. This study presents a reliable method for studying Charpy impact tests. The influence of geometric parameters is obtained, which provides a reference method for the study of impact toughness of high toughness materials.

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Section: Finite Element Modelingmentioning

confidence: 99%

Nonlinear Impact Damage Evolution of Charpy Type and Analysis of Its Key Influencing Factors

Mao,

Xu,

Yang

et al. 2024

Chin. J. Mech. Eng.

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“…The DBT behaviour is influenced by several factors, e.g. nature of alloying elements [2], secondary phases in matrix [3], radiation damage in Reactor Pressure Vessel (RPV) steels [4][5][6][7][8], microstructure [9], residual strain [10], grain boundary characteristics [11].…”

Section: Introductionmentioning

confidence: 99%

Comparison of mathematical and supervised machine-learning models for ductile-to-brittle transition in bcc alloys

Ahmedabadi

2024

Mater. Res. Express

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This study focuses on modelling Ductile-to-Brittle Transition (DBT) curves using various mathematical and supervised machine learning models. Charpy impact energy values are converted to normalized energy values to account for reductions in upper-shelf energy. The research introduces a saturation parameter in mathematical models to capture these variations and examines the influence of alloying elements, microstructure, and neutron irradiation on DBT behaviour in nuclear structural materials. Detailed analyses reveal how fitting parameters vary with these factors and demonstrate that mathematical models’ fitting parameters generally align with observed DBT curve trends. The predictive capabilities of these mathematical models are also compared with those of supervised machine learning models, highlighting the strengths and limitations of each approach in modelling DBT behaviour. An explainable approach is used for interpretation of machine learning models and it is shown that this approach can be effectively used for the influence of various independent parameters on impact energy.

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“…[2][3][4] The mechanical properties of a reactor pressure vessel (RPV) will deteriorate sharply because of the increase in dislocation density after the high-energy neutron beam irradiation in service. [5][6][7] Lin et al tested the Charpy impact energy of A508-3 steel before and after neutron irradiation and found that T 41J increased 68°C. 5) Marini et al found that the yield stress of 16MND5 increased by more than 14% after irradiation, and the ultimate tensile stress increased by more than 12%.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7] Lin et al tested the Charpy impact energy of A508-3 steel before and after neutron irradiation and found that T 41J increased 68°C. 5) Marini et al found that the yield stress of 16MND5 increased by more than 14% after irradiation, and the ultimate tensile stress increased by more than 12%. 8) In Pawel's study, the fracture toughness of various materials all decreased after irradiation to 3 dpa.…”

Section: Introductionmentioning

confidence: 99%