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14th International Conference on Fracture, ICF 2017

作者： Bai, Xiaoming Guo, Licheng Shi, Kaikai Zheng, Liangang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Astronautic Science and Mechanics Harbin Institute of Technology Harbin150001 China

A mesoscale numerical model for the damage and fracture behavior of particle reinforced composites is proposed in present work. In this model, the digital image technique is used to reconstruct the real microstructure of composite material. The damping boundary condition is applied to absorb the artificial reflected stress wave during the simulation. Thus, the damage and fracture behavior of particle reinforced material under complex impact loads can be investigated. © 2017 ICF 2017 - 14th International Conference on Fracture. All rights reserved.

关键词： Particle reinforced composites

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Calculation strategy for the determination of plasticity correction factors 13th

Calculation strategy for the determination of plasticity cor...

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13th Asia-Pacific Symposium on Engineering Plasticity and its Applications, AEPA 2016

作者： Du, Juan Shao, Xue Jiao Kan, Qian Hua Zhang, Ying Fu, Xiao Long Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Southwest Jiaotong University Chengdu610031 China

ISBN: (纸本)9783035710243

This paper presents an investigation about the plasticity correction factor, Ke, proposed in the RCC-M code, for the correction of elastic stress range exceeds twice the yield stress which results from both mechanical and thermal loading. The plasticity correction factors are analyzed using a calculation strategy based on the comparison between linear elastic and elastoplastic analyses. The RCC-M code provides the codified expressions of Ke and material parameters for general materials of components in nuclear power plant, but there are no expressions and material parameters for new materials. Several elastoplastic models, geometries and loading types are considered in this study based on the general materials listed in RCC-M code to determine the calculation strategy of Ke for new material. Based on the results, the expressions and parameters of Ke for titanium alloy are discussed. It turns the proposed Ke factor of titanium alloy can yield to sufficiently conservative results. A verification calculation of general materials is performed and the conservative allowance is obtained. © 2017 Trans Tech Publications, Switzerland.

关键词： Plasticity

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Research on motion error of cylindrical roller bearings under radial load

Research on motion error of cylindrical roller bearings unde...

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ASME 2018 International design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2018

作者： Yongjian, Yu Jishun, Li Guoding, Chen Yujun, Xue Zhuoyi, Si Gurgenci, Halim Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang Henan China School of Mechanical Engineering Northwestern Polytechnical University Xi’an Shanxi China School of Mechatronics Engineering Henan University of Science and Technology Luoyang Henan China School of Engineering University of Queensland BrisbaneQLD Australia

ISBN: (纸本)9780791851791

Since the rotary motion of a rolling bearing is implemented by bearing components under geometric constraints, the motion accuracy of an assembled bearing should also be the result of interaction among geometric errors of bearing components. Therefore, it is significant to understand the relationship between the geometric errors of bearing components and motion accuracy of an assembled bearing for the design of high accuracy bearing. Based on quasi-static analytical method, a mathematical model for motion error of cylindrical roller bearings is established considering the roundness error of outer raceway. The motion error of a rolling bearing is affected by the amplitude and harmonic order of the roundness error of outer raceway, number of rollers and the operating conditions such as radial load, rotary speed of outer ring. The effects of above parameters are analyzed. The results show that the motion accuracy of a cylindrical roller bearing degrades with the increase of amplitude of the roundness error of outer raceway and the rotary speed of outer ring. The variation of the radial displacement of outer ring varies periodically with the increase of the harmonic order of the roundness error of outer raceway, and its period is equal to the roller number. With the increase of the roller number, the variation of radial displacement of the outer ring fluctuates. The larger the radial load is, the smaller the variation of radial displacement of outer ring is. The results would be helpful to reduce the production costs by controlling the distribution of machining tolerance of bearing components. Copyright © 2018 ASME

关键词： Rollers (machine components)

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Investigation of temperature field inside a Rod bundle using two-color laser induced fluorescence 17

Investigation of temperature field inside a Rod bundle using...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Mi, Zhengpeng Li, Xing Huang, YunLong Tan, Sichao Du, Sijia Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin150001 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

Two-color laser induced fluorescence (LIF) technique is applied to investigate the temperature distribution in rod bundles with spacer grid in this paper. In order to evaluate the characteristic, dye spectrum was analyzed to study the spectral characteristic of dye, especially temperature-variation characteristic and thermosensitivity. A transparent experimental facility using matching index of refraction (MIR) approach was designed. Various influencing factors were analyzed in calibration experiment, and the point-to-point calibration curves of temperature-light intensity applied to rod bundle were present. Accordingly, using the calibration curves, temperature field was reconstructed downstream of the spacer grid. The results showed that sensitivity of dye according to different temperature and accuracy of experiment can be improved by selecting suitable dye combination and different wavelength range. Dye peculiarity with temperature was verified in this paper. Calibration curves of temperature-light intensity were obtained by point-to-point calibration. The temperature field in rod bundles can be reconstructed, based on calibration relations. Furthermore, the temperature distributions downstream of the spacer grid are obtained. It is concluded that two-color laser-induced fluorescence technique is applicable to non-intrusive and full-field measurement in rod bundles, and it can be used as good provider for data base to validate CFD codes and evaluate the spacer grid performance. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Temperature distribution

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A High Efficiency and Precision Interpolation Method for searching Fluid Field Information around Droplets in Sparse Two-phase Flow 17

A High Efficiency and Precision Interpolation Method for sea...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Zhao, Fulong A. Bo, Hanliang B. Zhou, Ya C. Liu, Ying D. Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China Science and Technology on Reactor System Design Technology Laboratory Nuclear PowerInstitute of China Chengdu610041 China

In the nuclear power station, the steam-water separator is a crucial appliance, a sequence of droplet lifecycle phenomena take place, including the droplet formation, droplet motion in the steam space, the mutual collisions between droplets, droplet extinction and the phase transformation. Together with the entraining steam, the droplets experiencing above complex processes consist a typical sparse two-phase flow, which can be well investigated by the Euler-Lagrange approach in terms of numerical simulations. With the Euler-Lagrange method, the microscopic behavior of the droplets and the steam-water separating mechanism are promising to be captured. When applying the Euler-Lagrange approach to simulate the droplets motion in the fluid field, one should first obtain the fluid parameters surrounding the droplets by the interpolation method, which may significantly influence the efficiency and precision of subsequent simulation results. In the present work, we examined the performance of four different interpolation schemes in the simulation of the droplet-steam flow inside the steam-water separator, including the k-d tree and the brute force search algorithm, the nearest point and 4-point interpolation method, and the boundary layer meshes refinement and total mesh refinement method. The computational efficiency and precision of the four methods were studied in comparison. The nearest point interpolation scheme takes less computing time, whereas with lower accuracy. Therefore, the sufficiently fine meshes are necessary to improve the calculation accuracy, which in turn lead to the reduced computational efficiency. The accuracy of the four-points interpolation scheme is remarkably higher than that of the nearest point interpolation scheme at the cost of much more (more than 2 folds) CPU time. To make a trade-off between the efficiency and precision, a high efficiency and precision interpolation method is put forward by combining the nearest point interpolation scheme

关键词： Mesh generation

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Structural design and strength analysis of multi-ring packed flywheel with heavy metal alloy segments

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IOP Conference Series: Materials science and Engineering 2019年第1期657卷

作者： L Jiang W Zhang C W Wu L P Zhang Y X Zhang Z Y Liu National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China

Flywheel, as a kinetic energy storage and conversion device, has promising applications due to its high efficiency, no pollution and long lifetime. In particular, with a three-layer structure packed with heavy metal alloy middle layer, a flywheel can achieve both a large rotational inertia and a high energy density. To guarantee structural strength safety of this type of multi-ring packed flywheel operating at high temperature, structural and thermal stress analysis for a flywheel with a tungsten alloy layer sandwiched between two stainless steel layers is carried out using finite element method (FEM). Based on plane stress assumption, flywheel stress characteristic along radius under assembly force, centrifugal force and thermal loading is demonstrated. The results show that, the rise of temperature causes inconsistent thermal expansion between neighbouring layers and results in a large thermal stress. Particularly, a high circumferential tensile stress occurs in the middle layer. It is also found that, the segments of the middle tungsten alloy layer can efficiently relieve the inconsistent thermal expansion and lower the thermal stress. Moreover, the number of segments significantly influences the efficiency of thermal stress releasing and the reserved gap between adjacent segments significantly improves the contact pressure between inner hub and tungsten alloy layer. This work may provide reference for structural design of the multi-ring packed flywheels under thermal loading.

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Numerical investigations of free surface vortices at hydraulic bottom intakes 17

Numerical investigations of free surface vortices at hydraul...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Shi-wen, Liu Jie, Zhou Wei, Huang Xiang, Cheng Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China 328# Section 1 Changshun Road ShuangliuChengdu610041 China

To study the development mechanisms and flow structure characteristics of the free surface vortices and get a better understanding of the vortices phenomena. Two-phase, three dimensions, transient CFD simulations of free surface vortices at hydraulic bottom intakes have been conducted by using a volume-of-fluid (VOF) method and the scale-adaptive simulation turbulence model with curvature correction (SAS-CC). The flow field distribution and structure in different stages of transient free surface vortices were presented and analyzed. It was found that the movement and development of the vortex was determined by the interactions of main flow transportation, the axial stretching and radial dissipation of vortex. In addition, the flow characteristics on different flow conditions also have been studied, the results showed that a relatively large flow rate and small export size lead to stronger vortex, and increasing the fluid viscosity would to some extent reduce the vortex. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Vortex flow

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Research on heat removal capability of secondary passive residual heat removal system for small modular reactor 17

Research on heat removal capability of secondary passive res...

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17th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2017

作者： Zhang, Dan Ran, Xu Zhou, Ke Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Xiehe Community ShuangLiu County Changshun Road No.328 Chengdu China

The transient performance of the Secondary Passive Residual Heat Removal system (SPRHR) for a small modular PWR was studied, the study focused on the thermal hydraulic characteristics at different initial water inventory in natural circulation loop of SPRHR. The result shows that, for SPRHR of SMR, after the short term of reactor scram, the small water inventory could maintain the two phase heat transfer state in the secondary side of Once-Through Steam Generator and the first side of emergency condenser, which will strengthen the heat transfer in SPRHR. However, for long time’s operation such as 72h, the water make up to the SPRHR should be considered as defense in depth for potential water leakage from system in accident situation. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Hydraulics

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Radiolytic gas bubbles' model and its application to AHR's transient neutronics analysis

Radiolytic gas bubbles' model and its application to AHR's t...

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2017 Transactions of the American Nuclear Society, ANS 2017

作者： Liangzi, Wang Dong, Yao Yingrui, Yu Shuai, Wang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China First-section of Chang Shun Avenue No. 328 ChengDu SiChuan610213 China

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Shape-Memory Polymers: Mechanically Robust and UV-Curable Shape-Memory Polymers for Digital Light Processing Based 4D Printing (Adv. Mater. 27/2021)

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Advanced Materials 2021年第27期33卷

作者： Biao Zhang Honggeng Li Jianxiang Cheng Haitao Ye Amir Hosein Sakhaei Chao Yuan Ping Rao Yuan-Fang Zhang Zhe Chen Rong Wang Xiangnan He Ji Liu Rui Xiao Shaoxing Qu Qi Ge Frontiers Science Center for Flexible Electronics (FSCFE) Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering (IBME) Northwestern Polytechnical University 127 West Youyi Road Xi'an 710072 China Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen 518055 China School of Engineering and Digital Arts University of Kent Canterbury Kent CT2 7NT UK State Key Laboratory for Strength and Vibration of Mechanical Structures Department of Engineering Mechanics Xi'an Jiaotong University Xi'an 710049 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 China Digital Manufacturing and Design Centre Singapore University of Technology and Design Singapore 487372 Singapore State Key Laboratory of Fluid Power and Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China

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