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A review of nondestructive examination technology for polyethylene pipe in nuclear power plant

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Frontiers of Mechanical Engineering 2018年第4期13卷 535-545页

作者： Jinyang ZHENG Yue ZHANG Dongsheng HOU Yinkang QIN Weican GUO Chuck ZHANG Jianfeng SHI institute of Process equipment Zhejiang University Hangzhou 310027 China zhejiang provincial special equipment inspection and Research institute Hangzhou 310027 China Georgia Tech Manufacturing institute Georgia Institute of TechnologyAtlanta GA 30332 USA

Polyethylene （PE） pipe, particularly high- density polyethylene （HDPE） pipe, has been successfully utilized to transport cooling water for both non-safety- and safety-related applications in nuclear power plant （NPP）. Though ASME Code Case N755, which is the first code case related to NPP HDPE pipe, requires a thorough nondestructive examination （NDE） of HDPE joints. However, no executable regulations presently exist because of the lack of a feasible NDE technique for HDPE pipe in NPP. This work presents a review of current developments in NDE technology for both HDPE pipe in NPP with a diameter of less than 400 mm and that of a larger size. For the former category, phased array ultrasonic technique is proven effective for inspecting typical defects in HDPE pipe, and is thus used in Chinese national standards GB/T 29460 and GB/T 29461. A defect- recognition technique is developed based on pattern recognition, and a safety assessment principle is summa- rized from the database of destructive testing. On the other hand, recent research and practical studies reveal that in current ultrasonic-inspection technology, the absence of effective ultrasonic inspection for large size was lack of consideration of the viscoelasticity effect of PE on acoustic wave propagation in current ultrasonic inspection technology. Furthermore, main technical problems were analyzed in the paper to achieve an effective ultrasonic test method in accordance to the safety and efficiency requirements of related regulations and standards. Finally, the development trend and challenges of NDE test technology for HDPE in NPP are discussed.

关键词： polyethylene pipe nuclear power plant ultrasonic inspection nondestructive testing safety assessment

Load Bearing Capacity and Safety Analysis for Strain-hardening Austenitic Stainless Steel Pressure Vessels

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Chinese Journal of Mechanical Engineering 2011年第2期24卷 179-186页

作者： CHEN Gang DENG Yangchun China special equipment Safety Supervision Administration General Administration of Quality Supervision and Inspection and Quarantine of the People＇s Republic of China Beijing 100088 China Hubei provincial special equipment Safety inspection and Research institute Wuhan 430077 China

By increasing the yield strengths of austenitic stainless steels for pressure vessels with strain hardening techniques,the elastic load bearing capacity of austenitic stainless steel pressure vessels can be significantly *** kinds of strain hardening methods are often used for austenitic stainless steel pressure vessels：Avesta model for ambient temperature applications and Ardeform model for cryogenic temperature *** methods are obtained from conventional design rules based on the linear elastic theory,and only consider the hardening effect from *** this limits the applications of strain hardening techniques for austenitic stainless steel pressure vessels because of safety *** paper investigates the effect of strain hardening on the load bearing capacity of austenitic stainless steel pressure vessels under large deformation,based on the elastic-plastic ***,to understand the effect of strain hardening on material behavior,the plastic instability loads of a round tensile bar specimen are derived under two different loading paths and validated by ***,to investigate the effect of strain hardening on pressure vessels strength, the plastic instability pressure under strain hardening is derived and further validated by finite element ***,the safety margin of pressure vessels after strain hardening is analyzed by comparing the safety factor values calculated from bursting tests,finite element analyses,and *** researching results show that the load bearing capacity of pressure vessels at ambient temperature is independent of the loading history when the effects of both material strain hardening and structural deformation are *** element simulations and bursting tests results show that the minimum safety factor of austenitic stainless steel pressure vessels with 5% strain hardening is close to the recommended value for common pressure vessels specified in th

关键词： pressure vessel austenitic stainless steel strain hardening load bearing capacity safety margin

Mechanical Behavior of Plastic Pipe Reinforced by Cross-Winding Steel Wire Subject to Foundation Settlement

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Transactions of Nanjing University of Aeronautics and Astronautics 2015年第3期32卷 348-354页

作者：李翔施建峰李军何兴建 China special equipment inspection and Research Institude institute of Pressure equipment Zhejiang University institute of Chemical Engineering China University of Petroleum(Beijing)

Plastic pipe reinforced by cross helically wound steel wires(PSP)is a new plastic-matrix steel composite pipe developed in *** investigate the stress of PSP under foundation settlement,a finite element model(FEM)is *** stresses and strains of PSP are obtained by the FEM *** mechanic behavior of PSP subject to a foundation settlement is ***,the influence factor analysis of settlement deformation,such as settlement depth,overlying soil depth,diameter of PSP and inner pressure of PSP,are discussed.

关键词： composite pipe finite element model(FEM) internal

Optimal design of pressure vessel using an improved genetic algorithm

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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2008年第9期9卷 1264-1269页

作者： Peng-fei LIU Ping XU Shu-xin HAN Jin-yang ZHENG institute of Chemical Machinery and Process equipment Zhejiang University Hangzhou 310027 China institute of Applied Mechanics Zhejiang University Hangzhou 310027 China Hangzhou special equipment inspection institute Hangzhou 310003 China

As the idea of simulated annealing (SA) is introduced into the fitness function, an improved genetic algorithm (GA) is proposed to perform the optimal design of a pressure vessel which aims to attain the minimum weight under burst pressure con- straint. The actual burst pressure is calculated using the arc-length and restart analysis in finite element analysis (FEA). A penalty function in the fitness function is proposed to deal with the constrained problem. The effects of the population size and the number of generations in the GA on the weight and burst pressure of the vessel are explored. The optimization results using the proposed GA are also compared with those using the simple GA and the conventional Monte Carlo method.

关键词： Pressure vessel Optimal design Genetic algorithm (GA) Simulated annealing (SA) Finite element analysis (FEA)

Highly conductive and stable iodine doped argyrodite electrolyte for all-solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期100卷 50-58页

作者： Gaozhan Liu Jing Zhang Jing Yang Jinghui Chen Xingyue Xiao Xiayin Yao Ningbo institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Lithium argyrodites with high ionic conductivity and low cost are considered as one of the most prospective solid electrolytes for all-solid-state lithium ***,the poor chemical stability and compatibility with lithium metal limit their ***,Li_(5.4)PS_(4.4)Cl1.4I0.2solid electrolyte with high ionic conductivity of 11.49 m S ccm^(-1)and improved chemical stability is synthesized by iodine *** ultra-thin Li_(5.4)PS_(4.4)Cl_(1.4)I_(0.2)membrane with thickness of 10μm can be obtained by wet coating process,exhibiting a high ionic conductivity of 2.09 mS ccm^(-1)and low areal resistance of 1.17Ωcm^(-2).Moreover,iodine doping could in-situ form LiI at the lithium/electrolyte interface and improve the critical current density of Li_(5.4)PS_(4.4)Cl_(1.6)from 0.8 to 1.35 mA cm^(-2).The resultant LiCoO_(2)/Li_(5.4)PS_(4.4)Cl_(1.4)I_(0.2)/Li battery shows excellent cycling stability at 1 C,with a reversible specific capacity of 110.1 mA h g^(-1)and a retention of 80.5% after 1000 *** addition,the assembled LiCoO_(2)/Li_(5.4)PS_(4.4)Cl_(1.4)I_(0.2)membrane/Li pouch cell delivers an initial discharge capacity of 110.4 mA h g^(-1)and 80.5% capacity retention after 100 cycles.

关键词： Argyrodite electrolytes lodine doping lonic conductivity Stability All-solid-state lithium battery

高透明和鲁棒性超疏水玻璃的激光制备（英文）

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Journal of Central South University 2025年第01期 160-173页

作者：刘超王青华葛志强李昊昱付佳俊王慧鑫张泰瑞 School of Mechanical Engineering Southeast University Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical and Power Engineering Nanjing Tech University special equipment Safety Supervision inspection institute of Jiangsu Province School of Materials Science and Engineering Southeast University institute of Agricultural Facilities and equipment Jiangsu Academy of Agricultural Sciences Key Laboratory of Protected Agriculture Engineering in the Middle and Lower Reaches of Yangtze River Ministry of Agriculture and Rural Affairs

超疏水玻璃在内窥镜、太阳能电池板等工程和医学领域具有广阔的发展前景。然而，实现超疏水性所需的表面形貌将不可避免地影响玻璃的表面透明度，限制玻璃材料的应用。为解决表面透明度与超疏水性之间的矛盾，本文采用了一种高效、低成... 详细信息

超疏水玻璃在内窥镜、太阳能电池板等工程和医学领域具有广阔的发展前景。然而，实现超疏水性所需的表面形貌将不可避免地影响玻璃的表面透明度，限制玻璃材料的应用。为解决表面透明度与超疏水性之间的矛盾，本文采用了一种高效、低成本的激光化学表面功能化工艺制备了超疏水玻璃表面。结果表明，激光织构可以有效地将空气捕获在表面微纳结构中，从而减小固液接触面积和界面张力。化学处理可加速表面含碳疏水基团的沉积，显著降低表面能。在分层微纳结构和低表面能的共同作用下，玻璃表面表现出卓越的超疏水性，接触角为155.8°，滚动角为7.2°。制备的超疏水玻璃的表面透明度仅比未处理表面的透明度低5.42%。这种具有高透明度的超疏水玻璃经过耐久性和稳定性试验后，仍保持着优异的超疏水性能。这种高透明度、高鲁棒性的超疏水玻璃的制备工艺可为进一步拓展玻璃材料的应用价值提供了参考。

关键词：超疏水玻璃激光化学透明度鲁棒性微纳织构

Preface to special Issue on Optoelectronic Neuromorphic Devices

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Journal of Semiconductors 2025年第2期46卷 2-4页

作者： Zhenyi Ni Zhongqiang Wang Jia Huang Xiaodong Pi State key Laboratory of Silicon and Advanced Semiconductor Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Shangyu institute of Semiconductor Materials Shaoxing 312300China Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun 130024China School of Materials Science and Engineering&National Key Laboratory of Autonomous Intelligent Unmanned Systems Tongji UniversityShanghai 201804China institute of Advanced Semiconductors&zhejiang provincial Key Laboratory of Power Semiconductor Materials and Devices ZJ-UHangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 311200China

The rapid advancement of artificial intelligence(AI),recognized with Nobel Prizes in both Physics and Chemistry in 2024,has been revolutionizing countless aspects of modern life,driving innovations across diverse fields and reshaping how people interact with *** its great advances,the computing of AI systems is now approaching the limit of traditional computing based on the von Neumann architecture,which is characterized by separated memory and process units-a challenge known as the"von Neumann bottleneck".

关键词： approaching separated Neumann

Defects detection in typical positions of bend pipes using low-frequency ultrasonic guided wave

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Journal of Central South University 2015年第10期22卷 3860-3867页

作者：罗更生谭建平汪亮许焰 School of Mechanical and Electrical Engineering Central South University Hunan provincial special equipment inspection and Research institute Center of Public Courses Zhuhai College of Jilin University Department of Mechanical and Electrical Engineering Changsha University

In order to analyze the possibility of detecting defects in bend pipe using low-frequency ultrasonic guided wave, the propagation of T(0,1) mode and L(0,2) mode through straight-curved-straight pipe sections was studied. FE(finite element) models of bend pipe without defects and those with defects were introduced to analyze energy distribution, mode transition and defect detection of ultrasonic guided wave. FE simulation results were validated by experiments of four different bend pipes with circumferential defects in different positions. It is shown that most energy of T(0,1) mode or L(0,2) mode focuses on extrados of bend but little passes through intrados of bend, and T(0,1) mode or L(0,2) mode is converted to other possible non-axisymmetric modes when propagating through the bend and the defect after bend respectively. Furthermore, L(0,2) mode is more sensitive to circumferential notch than T(0,1) mode. The results of this work are beneficial for practical testing of pipes.

关键词： low-frequency ultrasonic guided wave bend pipe extrados of bend intrados of bend FE(finite element) simulation experimental investigation

Effects of Boron Addition on the Microstructure and Mechanical Properties ofγ′‑Strengthened Directionally Solidified CoNi‑Base Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1438-1452页

作者： Shasha Qu Yingju Li Bingyu Lu Cuiping Wang Yuansheng Yang institute of Metal Research Chinese Academy of SciencesShenyang 110016China Guangdong institute of special equipment inspection and Research Foshan 528251China College of Materials and Fujian provincial Key Laboratory of Materials Genome Xiamen UniversityXiamen 361005China

The effects of B addition on microstructure and mechanical properties of aγ′-strengthened CoNi-base superalloy are *** addition of B leads to a substantial increase in the volume fraction of both the eutectic structure and *** CoNi-base alloy shows a high solubility limit for the element *** become noticeable in the area surrounding the eutectic structure after the B level exceeds 0.46 at.%.It is found that the compression property and stress rupture life of the 4W2Ta alloys exhibit an initial rise followed by a subsequent drop as the B content gradually increases from 0.08 to 0.78 at.%.The 4W2Ta0.46B alloy demonstrates the most excellent high-temperature strength and stress rupture life,revealing that a moderate amount of B in the alloy noticeably enhances its mechanical properties by enhancing the grain boundary cohesion.

关键词： CoNi-base superalloy Borides Grain boundary Microstructure Mechanical properties