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学者姓名：卢凯
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Abstract ：
In our previous studies of Cr-coated Zr alloy cladding, models for the oxidation and degradation of Cr coating and for the oxidation and phase transformation of Zr alloy have been established. On these foundations, oxygen flux models for Cr-Zr non-eutectic and eutectic conditions are developed in this paper, enabling a comprehensive simulation of the oxidation processes of Cr-coated Zr alloy. The models are validated through oxidation experiments under isothermal and temperature ramp conditions, showing good agreement with the experimental data. The models can effectively simulate the processes where, under non-eutectic conditions, oxygen atoms first dissolve into the prior beta-Zr matrix after coating degradation, followed by the formation of alpha-Zr(O) and eventually ZrO2. For conditions with eutectic reaction, model assumption of immediate complete coating failure could lead to overestimation of substrate oxidation extent at low heating rates. This prediction deviation decreases as heating rate increases.
Keyword ：
Cr-coated Zr alloy Cr-coated Zr alloy Diffusion Diffusion High-temperature oxidation High-temperature oxidation Model development Model development Oxygen flux Oxygen flux
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| GB/T 7714 | Wang, Dong , Wu, Shihao , Lu, Kai et al. High-temperature oxidation of accident tolerant Cr-coated Zr alloy cladding: Model development and validation [J]. | JOURNAL OF NUCLEAR MATERIALS , 2025 , 606 . |
| MLA | Wang, Dong et al. "High-temperature oxidation of accident tolerant Cr-coated Zr alloy cladding: Model development and validation" . | JOURNAL OF NUCLEAR MATERIALS 606 (2025) . |
| APA | Wang, Dong , Wu, Shihao , Lu, Kai , Zhang, Yapei , Su, G. H. , Liu, Xi . High-temperature oxidation of accident tolerant Cr-coated Zr alloy cladding: Model development and validation . | JOURNAL OF NUCLEAR MATERIALS , 2025 , 606 . |
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This study provides investigations on whether the fracture toughness can be accurately predicted from mini-sized uniaxial tensile specimens with existing global and local approaches. The critical toughness model, based on classical fracture mechanics, and the energy release rate (ERR) model, based on damage mechanics, were used as the two representative global approaches. While the finite element simulated compact tension (CT) specimen implemented with Gurson-Tvergaard-Needleman model was used as the local approach. Specimen size effect was judged through the viewpoints of stress-strain relationship and damage development. It was proved that the specimen size has no significant influence on stress-strain relationship, and has little influence on damage developments when the thickness reaches 1.0 mm. Fracture toughness predictions were conducted on four metals, including two steels (SA508Gr.3Cl.1 and 18MnMoNbR), one aluminum alloy (6061-T651), and one titanium alloy (TC4). For TC4 exhibiting brittle cleavage features on the fracture surface of CT specimens, neither the global nor the local approach can accurately predict its fracture toughness. For 6061-T651 exhibiting both ductile and brittle features on the fracture surface of CT specimens, there exists significant macroscopic crack propagation at the moment of conventional fracture toughness determination. The existence of significant macroscopic crack is inconsistent with the "equivalent crack" assumption in the ERR model, leading to a failure in its fracture toughness prediction. For two steels following the "equivalent crack" assumption, the ERR model and the local approach yield more accurate predictions (with the maximum error around 10 %) than their critical toughness counterpart (with the maximum error around 30 %).
Keyword ：
Critical toughness model Critical toughness model Energy release rate model Energy release rate model Fracture toughness Fracture toughness Local approach Local approach Mini-sized uniaxial tensile specimen Mini-sized uniaxial tensile specimen
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| GB/T 7714 | Zhang, Tairui , Shang, Xiandong , Zhang, Naixin et al. An investigation on fracture toughness predictions from mini-sized uniaxial tensile specimens with global and local approaches [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 131 . |
| MLA | Zhang, Tairui et al. "An investigation on fracture toughness predictions from mini-sized uniaxial tensile specimens with global and local approaches" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 131 (2024) . |
| APA | Zhang, Tairui , Shang, Xiandong , Zhang, Naixin , Lu, Kai , Xie, Mingjiang . An investigation on fracture toughness predictions from mini-sized uniaxial tensile specimens with global and local approaches . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 131 . |
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In this work, hydrogen diffusion behavior and mechanisms in the 4130X steel influenced by temperature, locally high concentration, and grain boundary were studied by leveraging both electrochemical hydrogen permeation experiments and molecular dynamics simulations. It was revealed that the hydrogen diffusion coefficient of the 4130X steel was increased with increasing temperature and decreasing locally high hydrogen concentration. The grain boundaries with misorientation below 15 degrees characterized by an electron backscatter diffraction map were identified as hydrogen trapping sites, thus rendering a lower mean square displacement of hydrogen atoms and localized hydrogen diffusion trajectories. Furthermore, at a high hydrogen concentration of 4 at. %, these grain boundaries were saturated by hydrogen atoms, and platelet-like hydrogen clusters were formed within the lattice, which further inhibited the diffusive motion of hydrogen atoms. These findings would deepen our understanding of hydrogen embrittlement mechanisms by establishing the connections between macroscopic permeation behavior and atomic-scale hydrogen diffusion in structural materials.
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| GB/T 7714 | Li, Jiaqing , Zheng, Zhiye , Yu, Xi et al. Hydrogen diffusion mechanisms in the 4130X steel: An integrated study with electrochemical experiments and molecular dynamics simulations [J]. | JOURNAL OF APPLIED PHYSICS , 2024 , 136 (16) . |
| MLA | Li, Jiaqing et al. "Hydrogen diffusion mechanisms in the 4130X steel: An integrated study with electrochemical experiments and molecular dynamics simulations" . | JOURNAL OF APPLIED PHYSICS 136 . 16 (2024) . |
| APA | Li, Jiaqing , Zheng, Zhiye , Yu, Xi , Lu, Kai , Liang, Huilong , Yin, Pengbo et al. Hydrogen diffusion mechanisms in the 4130X steel: An integrated study with electrochemical experiments and molecular dynamics simulations . | JOURNAL OF APPLIED PHYSICS , 2024 , 136 (16) . |
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The stress intensity factor (SIF) solutions for subsurface flaws in flat plates are provided in Appendix A of ASME Boiler and Pressure Vessel Code Section XI. A part of the SIF solutions was initially provided in the 2015 edition. The solutions were obtained for the fourth order polynomial stress distribution base on the influence function method. The solutions were expanded in the 2021 edition for subsurface flaws near the surface of the plate. The additional solutions were obtained based on the J-integral from the elastic finite element analyses. However, recent investigations have found that there is a minor discrepancy in trend between the two sets of SIF solutions because they were obtained by using different numerical methods. Although the discrepancy is very small, the change in trend causes some difficulties in engineering applications. In this work, the SIF solutions are recalculated using the same numerical method based on the J-integral from elastic finite element analyses. The results are compared with the solutions in the current Section XI, RSE-M, and are finally cross-checked with the results obtained from an independent numerical model. The results are useful to eliminate the discrepancy in trend in the SIF solutions for subsurface flaws in flat plates in the current edition of Section XI. Copyright © 2024 by ASME.
Keyword ：
Boiler codes Boiler codes Convergence of numerical methods Convergence of numerical methods Fracture mechanics Fracture mechanics Pressure vessel codes Pressure vessel codes Pressure vessels Pressure vessels Stress analysis Stress analysis Stress concentration Stress concentration Stress intensity factors Stress intensity factors
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| GB/T 7714 | Li, Suo , Li, Yinsheng , Lu, Kai et al. ANALYSES OF STRESS INTENSITY FACTOR SOLUTIONS FOR SUBSURFACE FLAWS IN FLAT PLATES [C] . 2024 . |
| MLA | Li, Suo et al. "ANALYSES OF STRESS INTENSITY FACTOR SOLUTIONS FOR SUBSURFACE FLAWS IN FLAT PLATES" . (2024) . |
| APA | Li, Suo , Li, Yinsheng , Lu, Kai , Lacroix, Valéry , Dulieu, Pierre . ANALYSES OF STRESS INTENSITY FACTOR SOLUTIONS FOR SUBSURFACE FLAWS IN FLAT PLATES . (2024) . |
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In this paper, the cyclic elastic-plastic behaviors of the centrifugal steam compressor impeller (CSCI) structure under practical operating conditions are discussed employing the linear matching method (LMM). The three-stage strategy of the LMM is employed to determine the shakedown and ratchet boundaries by conducting a series of iterative direct steady cyclic analysis, and based on this, the load regions corresponding to different types of damage behavior that may occur during the operation are identified. Computational results reveal slight contraction in the structural response diagram when considering actual material constitutive relationships, compared to ideal elastic-plastic models. Meanwhile, by integrating the unified ratchet and fatigue program with fatigue experimental data, a series of constant low-cycle fatigue life curves has been presented for different service conditions. Furthermore, a comparison with detailed step-by-step inelastic analyses confirms the applicability and great efficiency of the LMM in practical engineering problems. The cyclic elastic-plastic behavior of impeller were investigated using the three-stage procedure. The effect of temperature-dependent and strain hardening on structural response of impeller were evaluated. The constant low-cycle life fatigue curves of the impeller structure were generated. The applicability and great efficiency of linear matching method have been confirmed.
Keyword ：
impeller impeller linear matching method linear matching method low cycle fatigue low cycle fatigue ratchet limit ratchet limit shakedown limit shakedown limit
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| GB/T 7714 | Li, Jianxun , Wang, Xiaoxiao , Ma, Zhiyuan et al. On the elastic-plastic behaviors of centrifugal steam compressor impeller under cyclic thermomechanical loading [J]. | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2024 , 47 (8) : 2888-2904 . |
| MLA | Li, Jianxun et al. "On the elastic-plastic behaviors of centrifugal steam compressor impeller under cyclic thermomechanical loading" . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 47 . 8 (2024) : 2888-2904 . |
| APA | Li, Jianxun , Wang, Xiaoxiao , Ma, Zhiyuan , Lu, Kai , Chen, Haofeng , Wang, Weiqiang . On the elastic-plastic behaviors of centrifugal steam compressor impeller under cyclic thermomechanical loading . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2024 , 47 (8) , 2888-2904 . |
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In the structural integrity assessment of an embrittled reactor pressure vessel (RPV) based on probabilistic fracture mechanics (PFM), it is crucial to consider both of the mean value and the uncertainty of the embrittlement prediction. Typically, the embrittlement prediction uncertainty is given by a normal distribution, and its standard deviation is determined from the residuals of the measured and predicted values of all data used to develop the embrittlement prediction method. Therefore, the same uncertainty is assumed regardless of neutron fluence and the available data. To overcome this issue, the Japan Atomic Energy Agency recently developed the embrittlement prediction method based on machine learning and Bayesian statistics, i.e., the Bayesian nonparametric (BNP) method, and introduced it to the PFM analysis code. The BNP method can predict the probability distribution according to data scarcity and provide more reasonable uncertainty because it estimates significant uncertainties where the scatter of actual measured data is large and the number of data is small. In this study, PFM analysis for a Japanese model RPV in a pressurized water reactor is conducted using the PFM analysis of structural components in aging light water reactors, where the embrittlement probability distribution calculated using the BNP method is used. Furthermore, the effects of different embrittlement prediction methods and uncertainties on the failure frequency of RPVs are investigated in the PFM analyses, and the results are presented.
Keyword ：
Irradiation embrittlement Irradiation embrittlement Machine learning Machine learning Probabilistic fracture mechanics Probabilistic fracture mechanics Reactor pressure vessel Reactor pressure vessel
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| GB/T 7714 | Takamizawa, H. , Lu, K. , Li, Y. . Probabilistic fracture mechanics analyses of a reactor pressure vessel using the irradiation embrittlement evaluation based on the Bayesian nonparametric method [J]. | INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING , 2024 , 210 . |
| MLA | Takamizawa, H. et al. "Probabilistic fracture mechanics analyses of a reactor pressure vessel using the irradiation embrittlement evaluation based on the Bayesian nonparametric method" . | INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING 210 (2024) . |
| APA | Takamizawa, H. , Lu, K. , Li, Y. . Probabilistic fracture mechanics analyses of a reactor pressure vessel using the irradiation embrittlement evaluation based on the Bayesian nonparametric method . | INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING , 2024 , 210 . |
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