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Integrated multi-scale approach combining global homogenization and local refinement for multi-field analysis of high-temperature superconducting composite magnets

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 747-762页

作者： Hanxiao GUO peifeng gao Xingzhe WANG Key Laboratory of Mechanics on Western Disaster and Environment of Ministry of Education Key Laboratory of Special Function Materials and Structure Design of Ministry of EducationCollege of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China

Second-generation high-temperature superconducting(HTS)conductors,specifically rare earth-barium-copper-oxide(REBCO)coated conductor(CC)tapes,are promising candidates for high-energy and high-field superconducting *** respect to epoxy-impregnated REBCO composite magnets that comprise multilayer components,the thermomechanical characteristics of each component differ considerably under extremely low temperatures and strong electromagnetic *** numerical models include homogenized orthotropic models,which simplify overall field calculation but miss detailed multi-physics aspects,and full refinement(FR)ones that are thorough but computationally ***,we propose an extended multi-scale approach for analyzing the multi-field characteristics of an epoxy-impregnated composite magnet assembled by HTS pancake *** approach combines a global homogenization(GH)scheme based on the homogenized electromagnetic T-A model,a method for solving Maxwell's equations for superconducting materials based on the current vector potential T and the magnetic field vector potential A,and a homogenized orthotropic thermoelastic model to assess the electromagnetic and thermoelastic properties at the macroscopic *** then identify“dangerous regions”at the macroscopic scale and obtain finer details using a local refinement(LR)scheme to capture the responses of each component material in the HTS composite tapes at the mesoscopic *** results of the present GH-LR multi-scale approach agree well with those of the FR scheme and the experimental data in the literature,indicating that the present approach is accurate and *** proposed GH-LR multi-scale approach can serve as a valuable tool for evaluating the risk of failure in large-scale HTS composite magnets.

关键词： epoxy-impregnated high-temperature superconducting(HTS)magnet multi-scale method global homogenization(GH) local refinement(LR) multi-field analysis

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高校公共实验平台安全管理体系运行实践与探索

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实验技术与管理 2024年第6期41卷 232-237页

作者：高培峰彭绍春许冰北京理工大学分析测试中心北京102488

针对公共实验平台安全管理的特点和存在问题,该文详述了某高校分析测试中心从运行机制、安全检查、安防系统、规章制度、标杆典型等方面加强安全管理建设,在实践中建立和完善了“34511”安全管理体系,有效提高了平台的安全管理水平,杜... 详细信息

针对公共实验平台安全管理的特点和存在问题,该文详述了某高校分析测试中心从运行机制、安全检查、安防系统、规章制度、标杆典型等方面加强安全管理建设,在实践中建立和完善了“34511”安全管理体系,有效提高了平台的安全管理水平,杜绝了安全事故发生,提升了开放服务成效,实现了“构建长效机制、打造安全平台、发挥资源优势、服务学校发展”的总体目标,为打造一流公共实验平台奠定了坚实的基础,也为高校同类平台的安全管理提供了有益借鉴。

关键词：公共实验平台实验室安全安全管理体系

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Measurement of Transverse Tensile Interfacial Strength of REBCO-Coated Conductors

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Acta Mechanica Solida Sinica 2022年第1期35卷 40-50页

作者： peifeng gao Xin Geng Houyuan Zhang Guian Man Xingzhe Wang Key Laboratory of Mechanics on Western Disaster and Environment Ministry of EducationCollege of Civil Engineering and MechanicsKey Laboratory of Special Function Materials and Structure Design of Ministry of EducationLanzhou UniversityLanzhou 730000China

We present a new test method for the accurate measurement of the transverse tensile interfacial strength of rare-earth barium copper oxide(REBCO)-coated conductor(CC)tapes to overcome heavy scattering of data tested using regular test methods.A new composite structure specimen is designed and constructed by solidifying a standard epoxy resin tensile specimen using the three-dimensional printing technology,where a short REBCO CC tape is *** feasibility of the proposed test method is numerically validated through finite element(FE)*** results show that the valid delaminated strength is 2.19-2.51 MPa with the maximum relative error of 7.3%,indicating the elimination of significant scattering in the tested *** analysing the morphology of the delaminated interfaces and energy-dispersive spectroscopy results,it is discovered that delamination primarily occurs at the interface between the REBCO superconducting layer and the buffer layer and that a small portion of the REBCO and buffer layers peels *** error analysis based on the FE method indicates that the tape is more likely to delaminate because of initial defects,whereas the adhesion at the edges of the CC tape due to the redundancy of the epoxy resin increases the resistance of the CC tape to delamination,resulting in a higher testing value than the real one.

关键词： REBCO-coated conductor tapes Delamination strength Transverse tension Experimental method Finite element analysis Cohesive zone model

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Electromagnetic-thermal-structure multi-layer nonlinear elastoplastic modelling study on epoxy-impregnated REBCO pancake coils in high-field magnets

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Superconductivity 2022年第1期1卷 2-13页

作者： peifeng gao Mingzhi Guan Xingzhe Wang Youhe Zhou Key Laboratory of Mechanics on Western Disaster and Environment Ministry of EducationCollege of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516001China

The elastoplastic mechanical behaviour of an epoxy-impregnated REBCO pancake winding under cryogenics and high magnetic field is investigated in the frame of finite element(FE)modelling.A two-dimensional axisymmetric electromagnetic-thermal-structure multi-physics multi-layer FE model with main layers of the coated conductor and insulation materials is *** radial stress and hoop stress on each constituent layer induced by thermal mismatch stress during cooling are *** mechanical behaviour of each constituent material is also analysed by considering the thermal mismatch stress and electromagnetic force under 20 T background *** results show that discrete stresses appear in all the constituent materials indicating that the multi-layer winding model containing the main constituent materials is necessary for the accurate stress analysis in an epoxy-impregnated REBCO *** stress of each constituent material induced by thermal mismatch during cooling process are too high to be ignored in the subsequent electromagnetic structure *** mechanical-magnetic coupling analyses show that the stresses of all the constituent materials increase with the transport *** plastic failure mainly induced by hoop stress successively occurs on copper stabilizer and Hastelloy substrate of the innermost turn,and the plastic region propagates from the inner turns to the outer turns with the increase of transport *** failure of the superconducting layer occurs before the yield in Hastelloy due to the direct action of Lorentz force on the superconducting *** transverse tensile stress increases with the increasing transport current,indicating that the risk of transverse delamination failure increases with the increase of transport *** mechanical failure modes including delamination within the conductor,plastic deformation in substrate and crack in superconducting layer should be seriously considered.

关键词： REBCO coated conductor tapes Epoxy impregnation winding Thermal mismatch stress Lorentz force Multi-physics finite element modelling Elastoplastic deformation

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Interface properties and failures of REBCO coated conductor tapes:Research progress and challenges

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Superconductivity 2023年第4期8卷 53-68页

作者： peifeng gao Yameng Zhang Xingzhe Wang Youhe Zhou Key Laboratory of Mechanics on Western Disaster and Environment Ministry of EducationCollege of Civil Engineering and MechanicsKey Laboratory of Special Function Materials and Structure Design of Ministry of EducationLanzhou UniversityLanzhou 730000China

RE‐Ba‐Cu‐O(REBCO,where RE=Y,Gd,Sm,and other rare earth elements)coated conductor(CC)tapes are promising for applications in high‐energy physics and high‐field science owing to their significant advantages such as high critical magnetic field,high current density,and the ability to achieve superconductivity at liquid nitrogen ***,the mechanical and superconducting performances of these CC tapes are significantly affected by interface failures,such as interfacial delamination and coating fractures,which arise from the complex interplay of mechanical stress induced by magnet processing,thermal mismatch stress during cooling,electromagnetic stress under high magnetic fields,and thermal stress during *** study comprehensively reviews the interface properties and failure behavior of REBCO CC ***,the research progress in characterizing the intricate interface properties of REBCO CC is systematically ***,the interface failure behavior in extreme multifield environments was analyzed and ***,this study outlines optimization strategies to mitigate interface failure risks in REBCO superconducting magnet ***,we address the current challenges and future perspectives on interface issues in REBCO CC *** addressing these challenges,this study offers valuable insights for advancing the development and practical implementation of superconducting technologies in diverse applications.

关键词： REBCO coated conductor tapes Interface properties Delamination Electro‐mechanical degradation Optimization

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Structural,electronic,and magnetic properties of quaternary Heusler CrZrCoZ compounds:A first-principles study

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Chinese Physics B 2020年第7期29卷 464-473页

作者： Xiao-Ping Wei Tie-Yi Cao Xiao-Wei Sun Qiang gao peifeng gao Zhi-Lei gao Xiao-Ma Tao The School of Mathematics and Physics Lanzhou Jiaotong UniversityLanzhou 730070China Institute of Materials Science Technische Universitat Darmstadt64287 DarmstadtGermany Key Laboratory of Mechanics on Western Disaster and Environment Ministry of EducationCollege of Civil Engineering and MechanicsKey Laboratory of Special Function Materials and Structure Design of Ministry of EducationLanzhou UniversityLanzhou 730000China School of Physical Science and Technology Guangxi UniversityNanning 530004China

Using the first-principles calculations,we study the structural,electronic,and magnetic properties along with exchange interactions and Curie temperatures for CrZrCoZ(Z=Al,Ga,In,Tl,Si,Pb)quaternary Heusler *** results show that the CrZrCoZ alloys are half-metallic ferrimagnets,and their total spin magnetic moments,which are mainly carried by the Cr atom,obey the Slater-Pauling *** of local density of states confirms that the exchange splitting between eg and t2g states leads to the formation of half-metallic *** to the calculated Heisenberg exchange coupling parameters,it is found that the Cr(A)-Cr(A)and Cr(A)-Zr(B)exchanges dominate the appearance of ferrimagnetic states in CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys,and it is the Cr(A)-Zr(B)and Zr(B)-Zr(B)exchanges for CrZrCoSi ***,we estimate the Curie temperatures of CrZrCoZ by using mean-field approximation,it is found that the CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys have noticeably higher Curie temperatures than room ***,we expect that the CrZrCoZ alloys are promising candidates in spintronic applications in future.

关键词： quaternary Heusler alloys electronic structure magnetic properties Curie temperature

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大型仪器开放实验混合式教学的探索与实践——以X射线光电子能谱仪为例

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大学教育 2024年第14期 72-76页

作者：王珊珊彭绍春高培峰杜建新北京理工大学分析测试中心北京102488 北京理工大学化学与化工学院北京102488

在“双一流”高校建设的新时期,大型精密仪器的引进能够完善和提升高校的育人环境,促进学科前沿成果转化,推动高素质创新型科研人才的培养。依托最新X射线光电子能谱仪,结合国际国内科研热点,课题组设计了“X射线光电子能谱技术在先进... 详细信息

在“双一流”高校建设的新时期,大型精密仪器的引进能够完善和提升高校的育人环境,促进学科前沿成果转化,推动高素质创新型科研人才的培养。依托最新X射线光电子能谱仪,结合国际国内科研热点,课题组设计了“X射线光电子能谱技术在先进材料表面研究中的应用”开放实验教学课程,形成了“云课堂-仪器硬件/应用软件现场培训-微课堂-实验项目研究”的新型开放实验混合式教学模式。该开放实验教学模式集知识养成、实验技能基础和学科关键问题于一体,不仅能丰富学生学科仪器的知识储备、提升学生严谨科学的实验操作素养,促进学生主动思考、提高主动分析和解决问题的能力,而且有利于培养学生关注科技前沿的意识和兴趣,激发学生投身科研事业的热情,开阔学生的视野,推动学生原始创新的动力。

关键词：开放实验混合式教学 X射线光电子能谱仪云课堂仪器硬件/软件现场培训微课堂

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基于SMART原则的高校实验技术人员绩效考核体系的建设与实践

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实验室研究与探索 2020年第12期39卷 258-261页

作者：高培峰彭绍春北京理工大学分析测试中心北京102488

以思想政治表现为前提,以工作业绩为核心,以个人综合素质情况和其他工作情况为辅助,制定了一整套针对公共实验平台实验技术人员的绩效考核体系。该体系基于SMART原则,参考关键业绩指标法,采用定性考核与定量考核相结合的方式,全面考察... 详细信息

以思想政治表现为前提,以工作业绩为核心,以个人综合素质情况和其他工作情况为辅助,制定了一整套针对公共实验平台实验技术人员的绩效考核体系。该体系基于SMART原则,参考关键业绩指标法,采用定性考核与定量考核相结合的方式,全面考察实验技术人员各方面的表现情况。实际考核结果显示,该绩效考核体系具有科学、规范、全面、可量化、操作性强等特点,能够真实地反映出公共实验平台实验技术人员实际工作成效。

关键词：公共实验平台实验技术人员绩效考核 SMART原则定性考核定量考核

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BBO超低温探头在分析测试中的应用

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实验技术与管理 2019年第8期36卷 94-97页

作者：艾惠高培峰北京理工大学分析测试中心

为了满足不同学科在科研过程中提出的新需求,超低温探头越来越受关注,应用也越来越广泛。通过以配有BBO H&F宽频超低温探头的Bruker Ascend 700 MHz核磁共振波谱仪为例,介绍了BBO超低温探头在分析测试中的应用。

关键词：高场核磁共振波谱仪超低温探头高灵敏度开放共享

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毛细管电泳法表征多肽及糖蛋白的稳定性

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色谱 2013年第6期31卷 543-549页

作者：汪勇高培峰赵新颖屈锋北京理工大学生命学院北京100081 北京市理化分析测试中心北京100089

建立了毛细管电泳表征多肽和糖蛋白稳定性的方法。分别以血管紧张素II(Ang II)和植物血球凝集素(PHA)、牛凝血酶(B-Thr)、人凝血酶(H-Thr)、辣根过氧化物酶(HRP)4种糖蛋白为多肽和糖蛋白的模式分子。从样品浓度、电泳缓冲液、样品溶液p... 详细信息

建立了毛细管电泳表征多肽和糖蛋白稳定性的方法。分别以血管紧张素II(Ang II)和植物血球凝集素(PHA)、牛凝血酶(B-Thr)、人凝血酶(H-Thr)、辣根过氧化物酶(HRP)4种糖蛋白为多肽和糖蛋白的模式分子。从样品浓度、电泳缓冲液、样品溶液pH和离子强度等方面优化了血管紧张素II的分离分析条件;从毛细管的选择、样品的电荷状态、电泳缓冲液的选择和分离电压的影响等方面讨论了糖蛋白的分离条件。Ang II和4种糖蛋白的稳定性试验结果表明:Ang II可在pH 7.4的硼酸盐缓冲液(0.02 mol/L)中于4℃下稳定放置48 h;4种糖蛋白可在pH 7.4硼酸盐缓冲液(0.2 mol/L)中于20,4,-20℃下稳定放置48 h;放置时间大于一周且小于四周时,在-20℃下各蛋白质均保持稳定;放置时间大于两周且小于四周时,只有HRP在上述3个温度下均保持稳定。该方法具有高效、快速、简单、低成本的特点,可广泛应用于多肽和蛋白质的稳定性表征。

关键词：毛细管电泳多肽糖蛋白稳定性

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