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  1. Article ; Online: Effect of plasticity of the cladding with different thicknesses on the bearing capacity of the brittle base wall of RPV under PTS loads

    Sun, Xin / Chai, Guozhong / Li, Xiangqing

    Heliyon. 2023 Apr., v. 9, no. 4 p.e14902-

    2023  

    Abstract: In the research field of reactor pressure vessel (RPV) subjected to pressurized thermal shock (PTS), the traditional linear elastic analytical method generally ignores the plastic properties of cladding. In fact, the neutron irradiation in RPV is easy to ...

    Abstract In the research field of reactor pressure vessel (RPV) subjected to pressurized thermal shock (PTS), the traditional linear elastic analytical method generally ignores the plastic properties of cladding. In fact, the neutron irradiation in RPV is easy to cause the embrittlement of the base material rather than cladding. So the elastic-plastic parameters of cladding are introduced into the FE model of the RPV with a sub-clad crack. The stress distributions in the thermal-mechanical coupling fields related to the base wall and cladding of different thicknesses are then obtained. The XFEM is used to simulate the crack growth in the nozzle area. The allowable internal pressure in the dangerous moment of the PTS is calculated to show the ultimate bearing capacity of the structure. The numerical results are compared with those only considering the elasticity of cladding. Furthermore, the law of the effect of plasticity of cladding on the structural safety is summarized.
    Keywords analytical methods ; brittleness ; cladding ; irradiation ; models ; neutrons ; plasticity ; RPV ; Sub-clad crack ; PTS ; Plasticity of cladding ; XFEM
    Language English
    Dates of publication 2023-04
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e14902
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Effect of plasticity of the cladding with different thicknesses on the bearing capacity of the brittle base wall of RPV under PTS loads.

    Sun, Xin / Chai, Guozhong / Li, Xiangqing

    Heliyon

    2023  Volume 9, Issue 4, Page(s) e14902

    Abstract: In the research field of reactor pressure vessel (RPV) subjected to pressurized thermal shock (PTS), the traditional linear elastic analytical method generally ignores the plastic properties of cladding. In fact, the neutron irradiation in RPV is easy to ...

    Abstract In the research field of reactor pressure vessel (RPV) subjected to pressurized thermal shock (PTS), the traditional linear elastic analytical method generally ignores the plastic properties of cladding. In fact, the neutron irradiation in RPV is easy to cause the embrittlement of the base material rather than cladding. So the elastic-plastic parameters of cladding are introduced into the FE model of the RPV with a sub-clad crack. The stress distributions in the thermal-mechanical coupling fields related to the base wall and cladding of different thicknesses are then obtained. The XFEM is used to simulate the crack growth in the nozzle area. The allowable internal pressure in the dangerous moment of the PTS is calculated to show the ultimate bearing capacity of the structure. The numerical results are compared with those only considering the elasticity of cladding. Furthermore, the law of the effect of plasticity of cladding on the structural safety is summarized.
    Language English
    Publishing date 2023-03-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e14902
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Book ; Conference proceedings: Digital design and manufacturing technology

    Chai, Guozhong

    selected, peer reviewed papers from the Conference on Digital Design and Manufacturing, 26-28 April, 2010, Hangzhou City, Zhejiang Province

    (Advanced materials research ; 102/104)

    2010  

    Event/congress Conference on Digital Design and Manufacturing (2010.04.26-28, HangzhouCity) ; Global Conference on Digital Design and Manufacturing Technology (2010.04.26-2, HangzhouCity)
    Author's details ed. by Guozhong Chai
    Series title Advanced materials research ; 102/104
    Language English
    Publisher Trans Tech Publ
    Publishing place Stafa-Zurich u.a.
    Document type Book ; Conference proceedings
    ISBN 087849278X ; 9780878492787
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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    Inter-library loan at ZB MED

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  4. Book ; Conference proceedings: Digital design and manufacturing technology

    Chai, Guozhong

    : selected, peer reviewed papers from the Conference on Digital Design and Manufacturing, 26-28 April, 2010, Hangzhou City, Zhejiang Province

    (Advanced materials research ; 102/104,1)

    2010  

    Event/congress Conference on Digital Design and Manufacturing (2010.04.26-28, HangzhouCity) ; Global Conference on Digital Design and Manufacturing Technology (2010.04.26-2, HangzhouCity)
    Author's details ed. by Guozhong Chai
    Series title Advanced materials research ; 102/104,1
    Language English
    Size XXXII, 487 S.
    Publisher Trans Tech Publ
    Publishing place Stafa-Zurich u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Book ; Conference proceedings: Digital design and manufacturing technology

    Chai, Guozhong

    : selected, peer reviewed papers from the Conference on Digital Design and Manufacturing, 26-28 April, 2010, Hangzhou City, Zhejiang Province

    (Advanced materials research ; 102/104,2)

    2010  

    Event/congress Conference on Digital Design and Manufacturing (2010.04.26-28, HangzhouCity) ; Global Conference on Digital Design and Manufacturing Technology (2010.04.26-2, HangzhouCity)
    Author's details ed. by Guozhong Chai
    Series title Advanced materials research ; 102/104,2
    Language English
    Size L S., S. 490-964
    Publisher Trans Tech Publ
    Publishing place Stafa-Zurich u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  6. Article: Evaluation of a New Rotator Cuff Trainer Based on Oscillating Hydraulic Damping.

    Wang, Yinghao / Wu, Jianfeng / Yang, Hongchun / Tang, Zhichuan / Chai, Guozhong

    Healthcare (Basel, Switzerland)

    2020  Volume 8, Issue 1

    Abstract: In order to provide a convenient way to strengthen the rotator cuff muscles and prevent rotator cuff injury, this study designed an innovative strength trainer specifically for shoulder rotator cuff based on oscillating hydraulic damping. We carried out ... ...

    Abstract In order to provide a convenient way to strengthen the rotator cuff muscles and prevent rotator cuff injury, this study designed an innovative strength trainer specifically for shoulder rotator cuff based on oscillating hydraulic damping. We carried out a myoelectric testing experiment to evaluate the shoulder rotation training effect and compared the results with traditional training equipment to verify the feasibility and validity of the new rotator cuff trainer (RCT). Then, we further explored the influence of different training postures and motion speeds on shoulder rotation training. In the experiment, subjects used three types of equipment (RCT, dumbbells and elastic bands) to perform shoulder rotation training under two movement speeds and two motion postures. The surface electromyography (sEMG) signals of targeted muscles were collected in real time and then further analyzed. The experimental results showed that when using the RCT, the muscle force generation sequence was more aligned with the biomechanical principles of shoulder rotation than using the other two training methods, and the target training muscles had the higher percentage of muscle work. During RCT training, a higher speed of movement (120°/s) led to a higher degree of muscle activation; coronal axis rotation was better for the infraspinatus training, and sagittal axis rotation was better for teres minor training. Based on these results, the RCT was proved to be more effective than traditional training methods. In order to exercise the different muscles of rotator cuff more comprehensively and extensively, different postures should be selected. Furthermore, the movement speed can be appropriately increased within the safe range to improve muscle activation.
    Language English
    Publishing date 2020-01-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2721009-1
    ISSN 2227-9032
    ISSN 2227-9032
    DOI 10.3390/healthcare8010024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Fracture Toughness, Breakthrough Morphology, Microstructural Analysis of the T2 Copper-45 Steel Welded Joints.

    Ding, Hao / Huang, Qi / Liu, Peng / Bao, Yumei / Chai, Guozhong

    Materials (Basel, Switzerland)

    2020  Volume 13, Issue 2

    Abstract: The performance and flaws of welded joints are important features that characteristics of the welding material influence. There is significant research activity on the performance and characteristics of welding joint materials. However, the properties of ...

    Abstract The performance and flaws of welded joints are important features that characteristics of the welding material influence. There is significant research activity on the performance and characteristics of welding joint materials. However, the properties of dissimilar welding materials and the cracking problem have not been thoroughly investigated. This investigation focuses on the evaluation and analysis of fracture mechanics, including fracture toughness, microstructural analysis, and crack initiation of T2 copper-45 steel dissimilar welding materials. Standard tensile and three-point bending experiments were performed to calculate the ultimate strength, yield strength, and elastic modulus for fracture toughness. The macro/micro-fracture morphology for tensile fracture and three-point bending fracture were analysed. Based on these investigations, it was concluded that the fracture types were quasi-cleavage and an intergranular brittle fracture mixed model. The deflection of the crack path was discussed and it was determined that the crack was extended along the weld area and tilted towards the T2 copper. Finally, the crack propagation and deflecting direction after the three-point bending test could provide the basis for improvement in the performance of welded joints based on experimental testing parameters and ABAQUS finite element analysis.
    Language English
    Publishing date 2020-01-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma13020488
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Three-dimensional localization of point acoustic sources using a planar microphone array combined with beamforming.

    Ding, Hao / Bao, Yumei / Huang, Qi / Li, Chunxiao / Chai, Guozhong

    Royal Society open science

    2018  Volume 5, Issue 12, Page(s) 181407

    Abstract: This paper presents a beamforming-based acoustic imaging (BBAI) method employing a two-dimensional (2D) microphone array that not only can locate an acoustic source in ... ...

    Abstract This paper presents a beamforming-based acoustic imaging (BBAI) method employing a two-dimensional (2D) microphone array that not only can locate an acoustic source in the
    Language English
    Publishing date 2018-12-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2787755-3
    ISSN 2054-5703
    ISSN 2054-5703
    DOI 10.1098/rsos.181407
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Enhanced light-harvesting by plasmonic hollow gold nanospheres for photovoltaic performance.

    Ding, Hao / Lv, Jindian / Wu, Huaping / Chai, Guozhong / Liu, Aiping

    Royal Society open science

    2018  Volume 5, Issue 1, Page(s) 171350

    Abstract: A 'sandwich'-structured ... ...

    Abstract A 'sandwich'-structured TiO
    Language English
    Publishing date 2018-01-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 2787755-3
    ISSN 2054-5703
    ISSN 2054-5703
    DOI 10.1098/rsos.171350
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Study on the Recognition of Exercise Intensity and Fatigue on Runners Based on Subjective and Objective Information.

    Chai, Guozhong / Wang, Yinghao / Wu, Jianfeng / Yang, Hongchun / Tang, Zhichuan / Zhang, Lekai

    Healthcare (Basel, Switzerland)

    2019  Volume 7, Issue 4

    Abstract: A running exhaustion experiment was used to explore the correlations between the time-frequency domain indexes extracted from the surface electromyography (EMG) signals of targeted muscles, heart rate and exercise intensity, and subjective fatigue. The ... ...

    Abstract A running exhaustion experiment was used to explore the correlations between the time-frequency domain indexes extracted from the surface electromyography (EMG) signals of targeted muscles, heart rate and exercise intensity, and subjective fatigue. The study made further inquiry into the feasibility of reflecting and evaluating the exercise intensity and fatigue effectively during running using physiological indexes，thus providing individualized guidance for running fitness. Twelve healthy men participated in a running exhaustion experiment with an incremental and constant load. The percentage of heart rate reserve (%HRR), mean power frequency (MPF) and root mean square (RMS) from surface EMG (sEMG) signals of the rectus femoris (RF), biceps femoris (BF), tibialis anterior muscle (TA), and the lateral head of gastrocnemius (GAL) were obtained in real-time. The data were processed and analyzed with the rating of perceived exertion (RPE) scale. The experimental results show that the MPF on all the muscles increased with time, but there was no significant correlation between MPF and RPE in both experiments. Additionally, there was no significant correlation between RMS and RPE of GAL and BF, but there was a negative correlation between RMS and RPE of RF. The correlation coefficient was lower in the constant load mode, with the value of only -0.301. The correlation between RMS and RPE of TA was opposite in both experiments. There was a significant linear correlation between %HRR and exercise intensity (r = 0.943). In the experiment, %HRR was significantly correlated with subjective exercise fatigue (r = 0.954). Based on the above results，the MPF and RMS indicators on the four targeted muscles could not conclusively identify fatigue of lower extremities during running. The %HRR could be used to identify exercise intensity and human fatigue during running and could be used as an indicator of recognizing fatigue and exercise intensity in runners.
    Language English
    Publishing date 2019-11-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2721009-1
    ISSN 2227-9032
    ISSN 2227-9032
    DOI 10.3390/healthcare7040150
    Database MEDical Literature Analysis and Retrieval System OnLINE

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