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Modified Layer-Removal Method for Measurement of Residual Stress in Pre-stretched Aluminium Alloy Plate

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Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 34-40页

作者： Liangbao Liu Jianfei sun Wuyi Chen pengfei sun School of Mechanical Engineering and Automation Beihang University

Residual stress is one of the factors affecting the machining deformation of monolithic structure parts in the aviation industry. Thus,the studies on machining deformation rules induced by residual stresses largely depend on correctly and efficiently measuring the residual stresses of workpieces. A modified layer-removal method is proposed to measure residual stress by analysing the characteristics of a traditional layer-removal method. The coefficients of strain release are then deduced according to the simulation results using the finite element method( FEM). Moreover,the residual stress in a 7075T651 aluminium alloy plate is measured using the proposed method,and the results are then analyzed and compared with the data obtained by the traditional methods. The analysis indicates that the modified layer-removal method is effective and practical for measuring the residual stress distribution in pre-stretched aluminium alloy plates.

关键词： pre-stretched aluminium alloy plate residual stress finite element method(FEM) modified layer-removal

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熔模铸造机车车钩工作应力与疲劳寿命仿真

轨道交通装备与技术 2024年第1期32卷 1-7页

作者：郭志启龚海军李福军高正源孙鹏飞钟发勇重庆交通大学机电与车辆工程学院重庆400047 天长市兴宇交通装备科技有限公司安徽滁州239300

为快速评估熔模铸造机车车钩性能,先对车钩材料取样测试获取材料性能参数;然后在ANSYS Workbench中分别对车钩3种典型受力和2种载荷谱下的静力及疲劳进行有限元分析。结果表明,机车启、停时车钩内最大应力分别为482.7 MPa和603.4 MPa,... 详细信息

为快速评估熔模铸造机车车钩性能,先对车钩材料取样测试获取材料性能参数;然后在ANSYS Workbench中分别对车钩3种典型受力和2种载荷谱下的静力及疲劳进行有限元分析。结果表明,机车启、停时车钩内最大应力分别为482.7 MPa和603.4 MPa,满足使用要求;采用重庆地铁3号线和大秦线载荷谱模拟,绘制出了重庆地铁3号线车钩的脉冲循环应力-疲劳寿命曲线,分析结果可以满足寿命要求。文章基于车钩材料性能测试和仿真分析,为熔模铸造车钩应力分布状态和疲劳寿命快速评估提供了便捷有效的方法。

关键词：机车车钩熔模铸造 E级钢微观组织疲劳仿真

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工程机械智能物联云管理服务平台研究应用

建筑机械化 2024年第8期45卷 12-15页

作者：陆凯邵驰华郭永康刘增辉孙鹏飞吕瑞中亿丰建设集团股份有限公司江苏苏州215000 河海大学江苏南京210024

设计开发了一种工程机械智能物联-云管理服务平台。该平台具有建筑设备物联定位模块、手机端设备流程操作软件、云端设备管理服务平台和终端应用客户端软件4个部分。经过开发与实践应用,该平台实现了数字化、物联网、大数据等技术的工... 详细信息

设计开发了一种工程机械智能物联-云管理服务平台。该平台具有建筑设备物联定位模块、手机端设备流程操作软件、云端设备管理服务平台和终端应用客户端软件4个部分。经过开发与实践应用,该平台实现了数字化、物联网、大数据等技术的工程机械全生命周期管理,可以减少监管过程冗余度,细化监管目标颗粒度,降低监管部门及各单位作业强度,保障工程机械各环节的安全性、稳定性及高效性,具有广阔的应用推广前景和显著的社会经济效益。

关键词：工程机械数字化云管理服务平台

Kinetic analysis and bacterium metabolization of α-pinene by a novel identified Pseudomonas ***

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Journal of Environmental Sciences 2012年第10期24卷 1806-1815页

作者： Zhuowei Cheng pengfei sun Yifeng Jiang Lili Zhang Jianmeng Chen Engineering Research Center of the Ministry of Education for Bioconversion and Biopurificationm Zhejiang University of Technology Hangzhou 310032 China. College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310032 China

Biodegradation has become a popular alternative remediation technology for its economic and ecological advantages. An aerobic bacterium （strain ZW） capable of degrading α-pinene was isolated from a biofilter by a selective enrichment. Based on the 16S rRNA gene analysis and physiochemical properties, this strain was identified as Pseudomonas veronii. Under the optimized condition achieved by the response surface methodology （RSM）, as well as pH 6.82, temperature 26.3℃ and NaC1 concentration 1.36%, almost 100% α-pinene could be removed within 45 hr. Enzymatic biodegradation by the crude intracellular enzyme could be described well by the Michaelis-Menten model in which the maximum degradation rate Vraax and the half-saturation constant Km were calculated to be 0.431 mmol/（***） and 0.169 mmol/L, respectively. Activity assay of catechol suggested that the strain ZW possessed a catechol- 1,2-dioxygenase and could decompose benzene-ring through ortho ring cleavage. Based on the identified intermediates by GC/MS, a new metabolic pathway was proposed, in which the final metabolites were some simpler organic and inorganic compounds. The present work demonstrated that the strain ZW would have a great application prospect for the remediation of α-pinene-contaminated environment.

关键词： Pseudomonas veronii ct-pinene growth conditions kinetics analysis metabolic pathway

Manipulating Na occupation and constructing protective film of P2-Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2) as long-term cycle stability cathode for sodium-ion batteries

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Journal of Energy Chemistry 2024年第1期88卷 603-611,I0013页

作者： Yiran sun pengfei Zhou Siyu Liu Zhongjun Zhao Yihao Pan Xiangyan Shen Xiaozhong Wu Jinping Zhao Junying Weng Jin Zhou School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 0255000ShandongChina School of Materials Science and Engineering Shandong University of TechnologyZibo 255049ShandongChina

P2-Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2)(NNMO)is promising cathode material for sodium-ion batteries(SIBs)due to its high specific capacity and fast Na+diffusion ***,the irreversible P2-O_(2)phase transformation,Na+/vacancy ordering,and transition metal(TM)dissolution seriously damage its cycling stability and restrict its commercialization ***,Na occupation manipulation and interface stabilization are proposed to strengthen the phase structure of NNMO by synergistic Zn/Ti co-doping and introducing lithium difluorophosp(LiPO_(2)F_(2))film-forming electrolyte *** Zn/Ti co-doping regulates the occupancy ratio of Nae/Nafat Na sites and disorganizes the Na+/vacancy ordering,resulting in a faster Na+diffusion kinetics and reversible P2-Z phase transition for P2-Na_(0.67)Ni_(0.28)Zn_(0.05)Mn_(0.62)Ti_(0.05)O_(2)(NNZMTO).Meanwhile,the LiPO_(2)F_(2)additive can form homogeneous and ultrathin cathode-electrolyte interphase(CEI)on NNZMTO surface,which can stabilize the NNZMTO-electrolyte interface to prevent TM dissolution,surface structure transformation,and micro-crack *** studies of in situ and ex situ characterizations and theoretical calculations were used to elucidate the storage mechanism of NNZMTO with Li PO_(2)F_(2)*** a result,the NNZMTO displays outstanding capacity retention of 94.44%after 500 cycles at 1C with 0.3 wt%Li PO_(2)F_(2),excellent rate performance of 92.5 mA h g^(-1)at 8C with 0.1 wt%Li PO_(2)F_(2),and remarkable full cell *** work highlights the important role of manipulating Na occupation and constructing protective film in the design of layered materials,which provides a promising direction for developing high-performance cathodes for SIBs.

关键词： Layered cathode Zn/Ti co-doping Na occupation Electrolyte additive Sodium-ion batteries

Composite structure Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG ceramics with high color spatial uniformity for white laser lighting

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Journal of Advanced Ceramics 2024年第2期13卷 189-197页

作者： pengfei Sang Le Zhang Jian Kang Mingzhou Li Shiwei Chen Peng Yang Bingheng sun Yang Li Wieslaw Strek Hao Chen Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology Xuzhou 221400China Xuzhou EAGLED Technology Co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials Technology Co. Ltd.Xuzhou 221116China Xuzhou Fuchang Electronic Technology Co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China School of Material Science and Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland

Composite ceramic phosphor(CCP)is a candidate light-conversion material to obtain the high-quality laser lighting *** based on the transmissive configuration model could not simultaneously meet the requirements of angular color uniformity and high thermal *** this study,a novel composite structure ceramic was designed,including Al_(2)O_(3)-YAG:Ce/YAG layered ceramic with a size of 1 mm×1 mm for lighting,and Al_(2)O_(3) ceramic(φ=16.0 mm)was used as the wrapping material due to its outstanding thermal *** prepared ceramics exhibited excellent thermal performance and no yellow ring *** this design,we achieved the match of the intensity distribution of the blue and yellow lights,resulting in a high angular color uniformity of 0.9 with a view angle of±80°.All ceramics showed no luminous saturation phenomenon,even the laser power density was increased up to 47.51 W/mm^(2).A high-brightness white-light source with a luminous flux of 618 lm,a luminous efficiency of 126 lm/W,a CCT of 6615 K,and a CRI of 69.9 was obtained in the transmissive *** particular,the surface temperature of the ceramic was as low as 74.1℃ under a high laser radiation(47.51 W/mm^(2)).These results indicate that Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG composite structure ceramic is a promising luminescent material in the high-power laser lighting applications.

关键词： Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG angular color uniformity high thermal stability high-power laser lighting

Improvement in the liquid zinc corrosion resistance of high Nb-TiAl alloys by pre-oxidation in a SiO_2-powder pack

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Science China(Technological Sciences) 2012年第2期55卷 505-509页

作者： sun pengfei ZHANG LaiQi ZHANG Li LIN JunPin State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The influence of pre-oxidation on the liquid zinc corrosion resistance of high Nb-TiAl alloys was *** pre-oxidation was performed by heating the specimens,buried in silica powder and encapsulated in a silica tube under a vacuum of 1.3×10-3 Pa at 950°C for 12 *** results showed that the preoxidized sample exhibited much higher liquid zinc corrosion resistance than that for the comparative *** excellent liquid zinc corrosion resistance was attributed to the formation of high-quality oxide scale during *** corrosion of all the samples in liquid zinc was caused by a localized breakdown in the oxide *** continuous and dense oxide scale formed during preoxidation substantially may prevent the liquid zinc from diffusing to the substrate,and its good continuity may also reduce the possibility of localized breakdown in the oxide scale.

关键词：二氧化硅粉末耐腐蚀性预氧化 TIAI合金锌液 TiAl合金氧化铁皮氧化过程

NIR-Ⅱprobe modified by poly(L-lysine)with efficient ovalbumin delivery for dendritic cell tracking

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Science China Chemistry 2020年第9期63卷 1272-1280页

作者： Chao Wang Bo sun Hui Bao Tao Wang Wenjuan Xu pengfei sun Quli Fan Wei Huang Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing 210023China Frontiers Science Center for Flexible Electronics&Shaanxi Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072China

Dendritic cell(DC)vaccine is an effective strategy for cancer immunotherapy by carrying antigen into DCs and migrating these DCs to drain lymph nodes after *** this article,second near-infrared window(NIR-II)fluorescent nanoparticles have been used to uptake antigen and activate ***(OVA),an antigen for immunization,can be loaded on the surface of these NIR-II fluorescent nanoparticles via electrostatic interaction by virtue of their functionalized poly(L-lysine)(PLL),which exhibits biocompatibility and strong selective interaction with *** addition,these antigen-loaded complexes can efficiently be engulfed by immature DCs to induce DC maturation and cytokine *** subcutaneous injection,highly sensitive NIR-II fluorescence signal from nanoparticles indicates that nanoparticle-labeled DCs can successfully migrate into lymph nodes in vivo,showing great promise in immunotherapy against cancer.

关键词： poly(L-lysine) DC vaccine NIR-Ⅱfluorescence tracking

High speed laser cladding as a new approach to prepare ultra-high temperature ceramic coatings

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Journal of Advanced Ceramics 2024年第2期13卷 143-154页

作者： Qiyao Deng pengfei He Chuan sun Yang Li Yue Xing Yujie Wang Jinglong Li Xiubing Liang Xin Wang Yujie Zhou Yujun Cai National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould Tianjin University of Technology and EducationTianjin 300222China Defense Innovation Institute Academy of Military ScienceBeijing 100071China School of mechanical engineering Tianjin University of Technology and EducationTianjin 300222China Scientific and Technological Innovation Center Beijing 100012China

Ultra-high temperature ceramic(UHTC)coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal *** study provides a new approach to fabricate UHTC coatings with high speed laser cladding(HSLC)technology,and places more emphasis on investigating the formation mechanism,phase compositions,and mechanical properties of HSLC-UHTC *** show that a well-bonded interface between the coating and the tantalum alloy substrate can be *** coating is mainly composed of(Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W)metal solid solution *** a relatively high powder feeding rate,the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to~50μm is successfully *** for the mechanical properties of the HSLC coatings,the fracture toughness of the coating decreases with the increase of powder feeding *** increase of carbide solid solution phase can significantly improve the high temperature microhardness(552.7±1.8 HV0.5@1000℃).The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer,which is a very promising candidate scheme for thermal protection coating.

关键词： high speed laser cladding(HSLC) ultra-high temperature ceramic(UHTC) thermal protection coating microstructure mechanical properties