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Finite element analysis and experimental study on the sealing performance of low-phenyl silicone rubber sealing rings

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Railway Sciences 2025年第1期4卷 123-137页

作者： Ming Gao Dongkai Li Kun Liu Shuliang Xu Feng Zhao Ben Guo Anhui Pan Xiao Xie Huanre Han Metals and Chemistry research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina Department of Locomotive and Car China State Railway Group Company LimitedBeijingChina Rolling Stock Department China Railway Harbin Group Company LimitedHarbinChina

Purpose–The brake pipe system was an essential braking component of the railway freight trains,but the existing E-type sealing rings had problems such as insufficient low-temperature resistance,poor heat stability and short service *** address these issues,low-phenyl silicone rubber was prepared and tested,and the finite element analysis and experimental studies on the sealing performance of its sealing rings were carried ***/methodology/approach–The low-temperature resistance and thermal stability of the prepared lowphenyl silicone rubber were studied using low-temperature tensile testing,differential scanning calorimetry,dynamic thermomechanical analysis and thermogravimetric *** sealing performance of the lowphenyl silicone rubber sealing ring was studied by using finite element analysis software abaqus and ***–The prepared low-phenyl silicone rubber sealing ring possessed excellent low-temperature resistance and thermal *** to the finite element analysis results,the finish of the flange sealing surface and groove outer edge should be ensured,and extrusion damage should be *** sealing rings were more susceptible to damage in high compression ratio and/or low-temperature *** the sealing effect was ensured,a small compression ratio should be selected,and rubbers with hardness and elasticity less affected by temperature should be *** prepared low-phenyl silicone rubber sealing ring had zero leakage at both room temperature(RT)and�***/value–The innovation of this study is that it provides valuable data and experience for the future development of the sealing rings used in the brake pipe flange joints of the railway freight cars in China.

关键词： Low-phenyl silicone rubber Sealing ring Sealing performance Finite element analysis Leakage

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The Mechanism of Heating Rate on the Secondary Recrystallization Evolution in Grain Oriented Silicon Steel

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 275-282页

作者： GAO Qian LI Jun WANG Xianhui CAO Laifu GONG Jian LI Bo Central Iron and Steel research Institute group Beijing 100081China Shougang Zhixin Electromagnetic Material R&D(Beijing)Co. Ltd.Beijing 101300China Beijing Shougang Co. Ltd.Qian’an 064404China

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing,in which the evolution of magnetic properties,grain orientations and precipitates were *** illustrate the Zener factor,the diameter and number density of precipitates of interrupted testing samples were statistically *** effect of precipitate ripening on the Goss texture and magnetic property was *** indicated that the trend of Zener factor was similar under different heating rates,first increasing and then decreasing,and that the precipitate maturing was greatly inhibited as the heating rate *** recrystallization was developed at the temperature of 1010℃when a heating rate of 5℃/h was used,resulting in Goss,Brass and{110}oriented grains growing abnormally and a magnetic induction intensity of ***,increasing the heating rate to 20℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss ***,when the heating rate was extremely fast,such as 40℃/h,poor secondary recrystallization was developed with many island grains,corresponding to a decrease in magnetic induction intensity to 1.87 *** a suitable heating rate of 20℃/h,the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1020℃were found among the experimental variables in this *** heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates,leading to the deviation and dispersion of Goss texture,thereby reducing the magnetic properties.

关键词： high temperature annealing heating rate secondary recrystallization grain oriented silicon steel

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Controlling segregation and hardenability of gear steel based on as-cast structure

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Journal of Iron and Steel research International 2025年第1期32卷 144-158页

作者： Hai-jie Wang Ze Zhang Peng Lan Gang Chen Pu Wang Chuan-hui Jiang Jia-quan Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Weifang Iron and Steel group Co. Ltd.Weifang 261000ShandongChina

Hardenability significantly impacts the distortion of gear during heat treatment,correlated to the uniformity of solute distribution in steel *** experimental analysis was conducted on the macrostructure,solute distribution,dendrite structure,and rod hardenability of 20CrMnTiH gear steel in continuously cast blooms and hot roller *** evaluation approach by the standards for the hardenability of gear steel rods and the corresponding blooms was analyzed,and the inheritance mechanism from solidification segregation to hardenability fluctuation of gear steel was *** results indicate that semi-macroscopic spot segregation located in the equiaxed zone exhibits larger size,higher solute enrichment,and worse solute homogeneity,leading to significant solute fluctuations in the blooms and hardenability fluctuation in the *** increasing the liquid steel superheat from 35 to 40℃,reducing the mold electromagnetic stirring from 300 to 100 A,and implementing the soft reduction(SR)of 7 mm at the solidification end,the equiaxed ratio of the strand decreased from 26.42%to 6.69%.Consequently,the solute fluctuation range and standard deviation decrease significantly in the transverse section,while the maximum segregation ratio,average fluctuation range,and average standard deviation of solutes C,Cr,and Mn in the spot segregation decrease at the same *** the meanwhile,the equiaxed ratio of the rod decreased from 24.89%to 4.09%,and the structure of the hardenability detection zone was transformed from equiaxed crystals to columnar ***,the solute fluctuation range and standard deviation in the transverse section decreased,while the homogeneity in spot segregation was also *** hardness difference of A and B surfaces at J9 and J15 positions was smaller than 2 HRC,meeting the qualification standard for hardenability.

关键词： Gear steel Continuous casting Solute distribution Dendritic structure Hardenability

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The Electric Vehicle Surge:Effective Solutions for Charging Challenges with Advanced Converter Technologies

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Energy Engineering 2025年第2期122卷 431-469页

作者： Rajanand Patnaik Narasipuram Md M.Pasha Saleha Tabassum Amit Singh Tandon Sustainability group Cyient Ltd.Pune411057India Department of Electronics and Communication Engineering K.S.R.M.College of EngineeringKadapa516003India Department of Electrical and Electronics Engineering K.S.R.M.College of EngineeringKadapa516003India Mobility group Eaton India Innovation Center LLPPune411028India

The global adoption of Electric Vehicles(EVs)is on the rise due to their advanced features,with projections indicating they will soon dominate the private vehicle ***,improper management of EV charging can lead to significant *** paper reviews the development of high-power,reliable charging solutions by examining the converter topologies used in rectifiers and converters that transfer electricity from the grid to EV *** covers technical details,ongoing developments,and challenges related to these topologies and control *** integration of rapid charging stations has introduced various Power Quality(PQ)issues,such as voltage fluctuations,harmonic distortion,and supra-harmonics,which are discussed in *** paper also highlights the benefits of controlled EV charging and discharging,including voltage and frequency regulation,reactive power compensation,and improved power *** energy management and control strategies are crucial for optimizing EV battery charging within microgrids to meet increasing *** stations must adhere to specific converter topologies,control strategies,and industry standards to function *** paper explores microgrid architectures and control strategies that integrate EVs,energy storage units(ESUs),and Renewable Energy Sources(RES)to enhance performance at charging *** emphasizes the importance of various RES-connected architectures and the latest power converter ***,the paper provides a comparative analysis of microgrid-based charging station architectures,focusing on energy management,control strategies,and charging converter *** goal is to offer insights into future research directions in EV charging systems,including architectural considerations,control factors,and their respective advantages and disadvantages.

关键词： Electric vehicles converters rectifiers power and voltage levels efficiency supra-harmonics

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China TCM Cardio Bank(CTC Bank):a high-quality,large-sample and real-world research database

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Science Bulletin 2025年第1期70卷 1-3页

作者： Yiwen Li Yanfei Liu Mengmeng Zhu Wenting Wang Keji Chen Luqi Huang Fengqin Xu Yue Liu National Clinical research Center for TCM Cardiology Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing 100091China Cardiovascular Disease group China Center for Evidence-based Medicine of TCMChina Academy of Chinese Medical SciencesBeijing 100091China Beijing Key Laboratory of Traditional Chinese Medicine Basic research on Prevention and Treatment for Major Diseases Experimental Research CenterChina Academy of Chinese Medical SciencesBeijing 100078China The Second Department of Geriatrics Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing 100091China China Center for Evidence-based Medicine of TCM China Academy of Chinese Medical SciencesBeijing 100078China

In recent years,real-world research(RWS)has advanced exponentially[1].There has been an increase in the number of retrospective cohort studies in China owing to their time-saving and economic advantages[2].Traditional Chinese medicine(TCM)is being integrated into the RWS *** large amount of multimodal and non-standardized information in the diagnostic and therapeutic treatment of TCM has created obstacles to the evidence-based development of TCM.

关键词： TCM modal database

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Geostatistics-block-based characterization of the relationship between rock mass quality and powder factor and its application on open-pit limit optimization

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International Journal of Mining Science and Technology 2025年第1期35卷 135-147页

作者： Jinduo Li Tianhong Yang Feiyue Liu Shigui Du Wenxue Deng Yong Zhao Honglei Liu Leilei Niu Zhiqiang Xu Center for Rock Instability and Seismicity research School of Resources&Civil EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Institute of Rock Mechanics Ningbo UniversityNingbo 315211China Shuguang Gold and Copper Open Pit Mine Zijin Mining Group Company LimitedHunchun 133300China

Accurately predicting the powder factor during blasting is essential for sustainable production planning in low-grade *** research presents a method for predicting powder factor based on the heterogeneity of rock mass rating(RMR).Considering a low-grade metal mine as an example,this study exploited geostatistical methods to obtain independent RMR for each block unit.A three-dimensional spatial distribution model for the powder factor was developed on the basis of the relationships between the RMR and the powder ***,models for blasting cost and mining value were built and employed to optimize the open-pit *** multi-variable model based on the RMR performed well in predicting the powder factor,achieving a correlation coefficient of 0.88(root mean square error of 4.3)and considerably outperforming the uniaxial compressive strength *** model optimization,the mean size and standard deviation of the fragments in the blast pile decreased by 8.5%and 35.1%,respectively,whereas the boulder yield and its standard deviation decreased by 33.3%and 58.8%,***,optimizing the open-pit limit using this method reduced the amount of rock,increased the amount of ore,and lowered blasting costs,thereby enhancing the economic efficiency of the *** study provides valuable insights for blasting design and mining decisions,demonstrating the advantages and potential applications of powder factor prediction based on the heterogeneity of rock mass quality.

关键词： Geostatistics method Powder factor Open-pit limit optimization Blasting cost Rock mass quality

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Real-time synchronous detection of wind and aerosol using a coherent lidar

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Chinese Optics Letters 2025年第01期 60-66页

作者：史悦罗雄孙培育董吉辉汤磊周杰王柯陈春利王云石周鼎富 Southwest Institute of Technical Physics Science College Civil Aviation Flight University of China Lidar and Device Laboratory Southwest Institute of Technical Physics Key Laboratory of Laser Device Technology of China North Industries group Corporation Limited China research and Development Academy of Machinery Equipment

Coherent lidar (CL) addresses existing constraints in CL data products by enabling simultaneous observation of multiple meteorological parameters such as cloud height, extinction coefficient, aerosol concentration, and wind field evaluation. A detailed analysis of CL echo signals was performed at a wavelength of 1550 nm, enabling accurate measurements of cloud height and aerosol concentration. Extensive data analyses and validation tests were conducted, aligning them with a 532 nm direct aerosol lidar (AL). The assessments of the aerosol extinction coefficient demonstrated notable consistency. This underscores the potential of advanced CL for providing prolonged and consistent observations across diverse meteorological conditions.

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Microstructure Analysis of TC4/Al 6063/Al 7075 Explosive Welded Composite Plate via Multi-scale Simulation and Experiment

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稀有金属材料与工程 2025年第1期54卷 27-38页

作者： Zhou Jianan Luo Ning Liang Hanliang Chen Jinhua Liu Zhibing Zhou Xiaohong National Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China China Coal Technology Engineering group Huaibei Blasting Technology research Institute Limited Company Huaibei 235000China

Because of the challenge of compounding lightweight,high-strength Ti/Al alloys due to their considerable disparity in properties,Al 6063 as intermediate layer was proposed to fabricate TC4/Al 6063/Al 7075 three-layer composite plate by explosive *** microscopic properties of each bonding interface were elucidated through field emission scanning electron microscope and electron backscattered diffraction(EBSD).A methodology combining finite element method-smoothed particle hydrodynamics(FEM-SPH)and molecular dynamics(MD)was proposed for the analysis of the forming and evolution characteristics of explosive welding interfaces at *** results demonstrate that the bonding interface morphologies of TC4/Al 6063 and Al 6063/Al 7075 exhibit a flat and wavy configuration,without discernible defects or *** phenomenon of grain refinement is observed in the vicinity of the two bonding ***,the degree of plastic deformation of TC4 and Al 7075 is more pronounced than that of Al 6063 in the intermediate *** interface morphology characteristics obtained by FEM-SPH simulation exhibit a high degree of similarity to the experimental *** simulations reveal that the diffusion of interfacial elements predominantly occurs during the unloading phase,and the simulated thickness of interfacial diffusion aligns well with experimental *** introduction of intermediate layer in the explosive welding process can effectively produce high-quality titanium/aluminum alloy composite ***,this approach offers a multi-scale simulation strategy for the study of explosive welding bonding interfaces.

关键词： TC4/Al 6063/Al 7075 composite plate explosive welding microstructure analysis multi-scale simulation

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Microstructure characteristics and corrosion behavior of metal inert gas welded dissimilar joints of 6005A modified by Sc and 5083 alloys

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 60-76页

作者： Guo-fu XU Liang LIU Ying DENG Yu ZENG Jun-chang CAO Lei TANG Xiao-yan PENG Jia-qi DUAN Mei-chan LIANG Qing-lin PAN School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Power Metallurgy Central South UniversityChangsha 410083China Baoshan Iron&Steel Co. Ltd.Shanghai 201900China Warwick Manufacturing group The University of WarwickCoventryCV47ALUK Guangdong Weiye Aluminum Factory group Co. Ltd.Foshan 528000China

The corrosion behavior and microstructure characteristics of metal inert gas(MIG)welded dissimilar joints of the 6005A alloy modified with Sc(designated as 6005A+Sc)and the 5083 alloy were investigated using corrosion tests and microscopy *** show that the dissimilar joints exhibit strong stress corrosion cracking(SCC)resistance,maintaining substantial strength during slow strain rate tensile ***,the heat-affected zone(HAZ)and base metal(BM)on the 6005A+Sc side show superior performance in terms of inter-granular corrosion(IGC)and exfoliation corrosion(EXCO)compared to the corresponding zones on the 5083 *** lower corrosion resistance of the 5083-BM and the 5083-HAZ can be attributed to the presence of numerous Al_(2)Mg_(3)phases and micro-scaled Al_(6)(Mn,Fe)intermetallics,mainly distributed along the rolling ***,the enhanced corrosion resistance of the 6005A+Sc-BM and the 6005A+Sc-HAZ can be attributed to the discontinuously distributed grain boundary precipitates(β-Mg_(2)Si),the smaller grain size,and the reduced corrosive current density.

关键词： metal inert gas welding dissimilar joint aluminum alloy corrosion,microstructure

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New insights on the role of chondroitin sulfate proteoglycans in neural stem cell–mediated repair in spinal cord injury

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Neural Regeneration research 2025年第6期20卷 1699-1700页

作者： Seyed Mojtaba Hosseini Soheila Karimi-Abdolrezaee Department of Physiology and Pathophysiology Spinal Cord Research CentreRady Faculty of Health SciencesUniversity of ManitobaWinnipegMBCanada Manitoba Multiple Sclerosis research Center WinnipegMBCanada Children Hospital research Institute of Manitoba WinnipegMBCanada

Extensive neurodegeneration is a hallmark of traumatic spinal cord injury (SCI) that underlies permanent sensorimotor and autonomic impairments (Alizadeh et al.,2019).Following the primary impact,the spinal cord undergoes a cascade of secondary injury mechanisms that are driven by disruption of the blood-spinal cord ba rrier,vascula r inju ry,glial reactivity,neu roinfla mmation,oxidative stress,lipid peroxidation,and glutamate excitotoxicity that culminate in neuronal and oligodendroglial cell death,demyelination,and axonal damage(Alizadeh et al.,2019).To achieve a meaningful functional recovery after SCI,regeneration of new neurons and oligodendrocytes and their successful growth and integration within the neural network are critical steps for reconstructing the damaged spinal cord tissue (Fischer et al.,2020).

关键词： peroxidation Fischer injury

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