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A decoupled method for time-dependent reliability-based design optimization

Science China(Technological Sciences) 2025年第1期68卷 308-320页

作者： Dequan ZHANG Meide YANG Xu HAN State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China

Time-dependent reliability-based design optimization(TRBDO)has received extensive attention because of its ability to achieve optimal solutions that help meet the requirement for whole lifecycle reliability by quantitatively considering dynamic ***,directly solving TRBDO problems is computationally expensive,if not prohibitive,owing to the need to repeatedly evaluate time-dependent probabilistic *** address this challenge,an efficient decoupled method called sequential optimization and time-dependent reliability assessment(SOTRA)is proposed in this *** method transforms the original TRBDO problem,initially formulated probabilistically,into a problem using percentile formulation after discretizing time-dependent performance *** adopting the equivalent minimum performance target point(EMPTP)concept,the TRBDO problem is further converted into an equivalent deterministic optimization problem,which is subsequently solved through a sequential iteration process involving deterministic optimization and time-dependent reliability *** efficiently and robustly search an EMPTP for reliability analysis,a time-dependent self-adaptive finite-step length method is *** verify the proposed SOTRA method against existing TRBDO methods,a numerical example,a benchmark structural design case of a simply supported beam,and an engineering application for flexible wheel design are exemplified in this *** results demonstrate that the proposed SOTRA method exhibits high efficiency and robustness in solving TRBDO problems.

关键词： reliability-based design optimization dynamic uncertainties time-dependent reliability analysis decoupled method sequential optimization and reliability analysis

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Ionogel electrolyte based on porous graphitic C3N4 nanosheets for room temperature to 150 ℃ quasi-solid-state lithium batteries

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Journal of Energy Chemistry 2025年第5期104卷 494-504页

作者： Zhaoen Liu Xueao Jiang Jiayin Chen Weijian Liu Long Zhao Yang Lv Zhiyong Li Yan Zhang Xiwen Wang Shiguo Zhang College of Energy Engineering Huanghuai University College of Materials Science and Engineering State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University School of Chemistry and Chemical Engineering Henan Normal University

Ionogels,generally formed by immobilizing ionic liquids （ILs） with polymer gelators,hold considerable promise as quasi-solid-state electrolytes （QSSEs） for lithium metal batteries （LMBs） due to their high safety and electrode ***,their practical use in high-temperature LMBs suffers from the softened polymer chains of gelator at high temperatures,leading to liquid leakage and severe growth of Li ***,a novel inorganic ionogel （PCNIL） combining lithium salt-containing IL with porous graphitic carbon nitride nanosheets （PCN） is developed through direct physical *** exhibits a superior ionic conductivity (0.75 mS cm-1) at room temperature similar to that of neat IL electrolyte （LiIL） and a Li+transference number （0.56） greatly higher than that of Li-IL （0.20）.Furthermore,PCNIL maintains a temperature-independent shear storage modulus of up to 5 MPa from room temperature to 150℃.Consequently,the Li|PCNIL|Li symmetrical cell demonstrates extended reversible lithium plating/stripping over 1200 h without dendritic *** robust mechanical strength,excellent thermal stability,and electrochemical stability of PCNIL allow Li|PCNIL|LiFePO4cells to operate stably in a wide temperature range of 25–150°C.

关键词： Graphitic carbon nitride High temperature Ionogels Lithium metal batteries Quasi-solid-state electrolytes

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Advancements in Poly(ionic liquid) composites with carbon nanomaterials

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advanced Industrial and Engineering Polymer Research 2025年第2期8卷 196-210页

作者： Li, Hui Gao, Jie Li, Zhiyong Zhang, Yan Zhang, Jun Zhang, Shiguo College of Materials Science and Engineering State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha410004 China School of Chemistry and Chemical Engineering Henan Normal University Xinxiang453007 China

Carbon nanomaterials have become essential in modern daily life. Their porous nature and good electrical conductivity are critical for composite applications. However, their inherent van der Waals forces and π-π interactions often result in spontaneous aggregation, which significantly hinders the uniform dispersion of carbon materials in polymer matrices. Establishing interactions between poly(ionic liquid) (PIL) and carbon materials ensures excellent compatibility. Integrating carbon materials with PIL markedly enhances mechanical strength, electrical conductivity, and thermal stability, benefiting the electronics, energy storage, and automotive industries. A thorough understanding of the physical and chemical properties of PILs is crucial for tailoring composite materials to specific applications, enhancing processing capabilities, and boosting performance. This article reviews recent advancements in PIL composites incorporating carbon nanomaterials and outlines future challenges in their development. © 2024 Kingfa Scientific and Technological Co. Ltd.

关键词： Automotive industry

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Defects response to precoated adhesive in Al/steel friction stir welded joint

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Journal of manufacturing Processes 2025年 141卷 1109-1118页

作者： Huang, Weiben Ding, Zhijie Li, Peng Zhao, Peng Zhou, Dianwu Huang, Yongxian Meng, Xiangchen Li, Yongbing Ma, Yunwu Dong, Honggang School of Materials Science and Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha410082 China State Key Laboratory of Precision Welding & Joining of Materials and Structures Harbin Institute of Technology Harbin150001 China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai200240 China

Friction stir welding (FSW) has been applied for welding dissimilar materials in advanced manufacturing industries such as shipbuilding, automotive and aerospace. For the broad popularization of adhesive in FSW, the innovative coupling method of friction stir welding-adhesive bonding (FSW-AB) technology was designed to join 5A06 aluminum alloy to 304 stainless steel. The joints were fabricated using a single-component structural adhesive applied manually in the pre-lap zone. The joints were then cured by the heat generated from FSW. Macrostructure, defect generation and tensile shear performances of the joints obtained using three different rotation speeds and different adhesive thickness were studied. The adhesive prevented direct plate contact, but the FSW-AB joint showed more flash. Adhesive expansion occurred on the advancing side due to structural asymmetry and uneven heat dissipation. Compared to conventional FSW, the joints produced by FSW-AB exhibited significantly reduced hook defects in the pin-affected zone, a smoother distribution of hardness across the weld cross-section, and notably elevated hardness on the retreating side of the base metal outside the shoulder. It is attributed to the difference in the degree of crystallization between the two caused by the difference in heat dissipation rate. The ultimate tensile shear load of the FSW-AB joint reached 93.3 % of the conventional FSW joint at 1200 rpm stirring speed and 0.25 mm adhesive thickness. Furthermore, the fracture modes of FSW-AB joints were mainly normal fracture and shear fracture. © 2025 The Society of manufacturing Engineers

关键词： Vickers hardness

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Improving aircraft nose wheel steering stability based on control continuation method

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Science China(Technological Sciences) 2025年第3期68卷 258-277页

作者： Qiaozhi YIN Dexu KONG Jiawei WANG Hong NIE Xiaohui WEI National Key Laboratory of Helicopter Aeromechanics Nanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing210016China AVIC Nanjing Engineering Institute of Aircraft Systems Nanjing211106China

Aircraft steering instability during the taxiing process sometimes occurs resulting from the unstable bifurcation phenomena of the nonlinear steering dynamic system,which may lead to severe *** this study,the control parameter design of an aircraft nose wheel steering control system based on the control continuation method is proposed to reduce the number of unstable bifurcation points and enlarge the system stable region area in a certain parameter ***,the aircraft turning performance can be improved ***,a nonlinear aircraft rollout dynamic model is constructed,and the aircraft ground steering bifurcation characteristics are obtained under the open-loop steering control ***,the bifurcation performances under three closed-loop nose wheel steering controllers based on the feedback control method are compared,and the control parameter of the quadratic nonlinear controller with a better bifurcation control effect is selected as a second bifurcation parameter to analyze the directional system stability via two-parameter bifurcation ***,the influence of a crosswind on the aircraft ground steering bifurcation performance is studied for various control parameter ***,the control effects of a traditional proportional-integral-derivative(PID)nose wheel steering control law and the designed feedback controller are compared and ***,a semi-physical experiment of the aircraft nose wheel steering system is carried out,and different control parameter values are selected for test verification,which can further verify the control effect of the designed nonlinear feedback *** results indicate that the feedback control method is unable to vary the system bifurcation types,but appropriate control parameter design can effectively shrink the system instability region and even eliminate the unstable Hopf bifurcation points under some specific working conditions,improving the aircraft ground turning stability re

关键词： aircraft taxiing dynamics and stability nose wheel steering control system control continuation steering bifurcation characteristics quadratic feedback control

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Stress anisotropy regulated wrinkling pattern evolution on a core-shell soft cylinder

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Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 132-144页

作者： Yan Zhao Zhipan Jie Yilong Zhang Guo-Yang Li Yanping Cao Chao Jiang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China Institute of Biomechanics and Medical Engineering AMLDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China

Diverse wrinkling patterns can occur on curved bilayer systems under differential growth or *** such systems,stress anisotropy is frequently encountered,and the coupling effect of curvature and stress anisotropy on the pattern evolution remains largely *** this study,we investigate the evolution of wrinkling patterns on a cylinder core-shell system with stress anisotropy leveraging both theoretical analysis and finite element *** buckling analysis has identified three distinct critical buckling modes regulated by the stress anisotropy,i.e.,axial sinusoidal mode,checkerboard mode,and circumferential sinusoidal *** finite element simulations,along with post-buckling analysis,reveal seven distinct evolutionary paths stemming from the three critical buckling *** present phase diagrams for both the critical buckling modes and their evolutionary paths,which are determined by dimensionless curvature and stress *** results not only expand the theoretical research on surface wrinkling of a core-shell soft cylinder but also introduce stress anisotropy as a significant parameter for regulating the wrinkling patterns and their evolutionary paths in curved bilayer *** revelation of a multitude of wrinkling patterns and their evolutionary pathways holds great potential for advancing applications that leverage tunable wrinkle surfaces.

关键词： wrinkling pattern evolutionary path stress anisotropy dimensionless curvature core-shell soft cylinder

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Corrosion and friction characteristics of microarc oxidation coating on Zr-4 alloy

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Ceramics International 2025年第12期51卷 15232-15241页

作者： Wang, Shuqi Jin, Rui Cui, Yi Ye, Zhiyun Chen, Guoliang Jin, Zhao Zou, Yongchun Xing, Yaru Wang, Yaming Ouyang, Jiahu Jia, Dechang Zhou, Yu Institute for Advanced Ceramics Harbin Institute of Technology Harbin150080 China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of Technology Harbin150001 China State Key Laboratory of Precision Welding & Joining of Materials and Structures China The 18th Institute China Academy of Launch Vehicle Technology Beijing100176 China

To improve the anti-wear and anti-corrosion of core structural materials of nuclear reactors, a relatively dense ceramic coating is fabricated on the Zr-4 alloy surface by microarc oxidation (MAO). Results show that compared with the substrate, the corrosion potential (−0.212V) of MAO coating in the simulated corrosion solution of a nuclear reactor (0.1 mol/L LiOH) exhibits a positive shift, and the corrosion current density (7.50 × 10−11 A∙cm−2) decreases by four orders of magnitude. During the long-term immersion process of the coated samples, the impedance modulus value still remains above 107 Ω cm2, indicating long-term corrosion protection. Moreover, under the GCr15-dry sliding condition, the friction coefficient of MAO coatings is high under various loads and is mainly attributed to abrasive wear. Under the wet lubrication sliding condition, the friction coefficient is low and stable at 0.35, with a good anti-friction effect. To summarize that, the MAO coating can provide sufficient long-term anti-corrosion and anti-wear protection for zirconium-based alloys, showing great potential in nuclear industry fields such as nuclear reactor cladding. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Zirconium alloys

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High-precision numerical modeling of the pro jectile launch and failure mechanism analysis of pro jectile-borne components

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Applied Mathematics and Mechanics(English Edition) 2025年第5期46卷 885-906页

作者： Xindan GUO Qiming LIU Xu HAN Tao LI Bin’an JIANG Canwei CAI State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China Artillery Ammunition Technology Laboratory PLA Army Academy of Artillery and Air DefenseHefei 230031China

As core components of precision-guided projectiles,projectile-borne components are highly susceptible to failure or even damage in complex high-overload environments,thereby significantly compromising launch reliability and ***,accurately characterizing the mechanical behavior of propellants remains challenging due to the limitations in the current internal ballistic theory and the constraints of large-scale artillery firing *** complicates the high-precision numerical modeling of projectile launch,and obstructs investigations into the failure mechanisms of projectile-borne ***,this paper identifies propellant parameters using the computational inverse method under uncertainty,further establishes high-precision numerical models of projectile launch,and explores the failure mechanisms of projectile-borne components in complex high-overload ***,a projectile launching experiment is meticulously designed and executed to obtain the breech pressure and muzzle ***,a general simulation model is built,and the powder burn model is used to simulate the ignition and ***,the propellant parameters are effectively identified with the computational inverse method by the combination of the experiments and simulations.A high-precision numerical model of projectile launch is modified with the parameters validated by another experiment,and the high-overload characteristics during projectile launch are thoroughly analyzed based on this ***,the high-overload characteristics of projectile-borne components are analyzed to elucidate the stress variation laws and to reveal the failure mechanisms influenced by time and spatial *** research provides an effective method for perfectly identifying propellant parameters and building high-precision numerical models of projectile ***,it provides significant guidance for the anti-high overload design and analysis of projectile-bo

关键词： projectile-borne component high-overload environment propellant parameter identification computational inverse technique failure mechanism

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Numerical Simulation and Experimental Investigation on Friction and Lubrication Behaviors of Chevron Micro-Textured Valve Plate/Cylinder Block Interface With Various Area Densities

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Journal of Tribology 2025年第7期147卷 072201页

作者： Chen, Luanxia Liu, Zhanqiang Huang, Haihong Zhu, Yingying School of Mechanical Engineering Hefei University of Technology Hefei230009 China Key Laboratory of Green Design and Manufacturing of Mechanical Industry Hefei University of Technology Hefei230009 China School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory for High-end Equipment and Advanced Technology of Metal Forming Shandong University Jinan250061 China

As the critical friction pairs of swashplate-type axial piston pumps, the cylinder block/valve plate lubricating interface is the primary source of friction, wear, and leakage in axial piston pumps. Surface micro-texturing has been widely employed in cylinder block/valve plate conjunctions to ameliorate tribological performance. However, little research has been conducted to investigate the influence of chevron micro-texture area density on the tribological behaviors and lubricating properties of cylinder block/valve plate interface both experimentally and numerically. In this article, the chevron micro-textures with various area densities were manufactured on H62 brass by micro-milling and subsequently characterized with a laser scanning confocal microscope (LSCM). The friction and wear performance of H62 brass/38CrMoAl conjunctions were obtained via disc-on-disc tribological tests to simulate the cylinder block/valve plate lubricating interface. Moreover, the load-carrying capacity of untextured and chevron micro-textured samples was numerically investigated under hydrodynamic lubrication. It was found that the chevron micro-textured surface with an area density of 30.1% displayed the lowest friction coefficient and the shallowest wear depth. Although the load-carrying capacity of chevron micro-textured samples with a high dimple area density was larger, the severe stress concentration induced by the reduced micro-texture spacing caused the increment and large fluctuations of friction coefficient. Copyright © 2024 by ASME.

关键词： Friction

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Unraveling the reaction mechanism of high reversible capacity CuP_(2)/C anode with native oxidation PO_(x) component for sodium-ion batteries

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Chinese Chemical Letters 2025年第1期36卷 574-578页

作者： Huixin Chen Chen Zhao Hongjun Yue Guiming Zhong Xiang Han Liang Yin Ding Chen State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China CAS key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute of Physics Chinese Academy of SciencesBeijing 100190China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi institutesChinese Academy of SciencesXiamen 361021China

Phosphorus-based anode is a promising anode for sodium-ion batteries(SIBs)due to its high specific capacity,however,suffers from poor electronic conductivity and unfavorable electrochemical *** metals such as copper(Cu)into phosphorus has been demonstrated to not only improve the electronic conductivity but also accommodate the volume change during cycling,yet the underline sodiation mechanism is not ***,take a copper phosphide and reduced graphene oxide(CuP_(2)/C)composite as an example,which delivers a high reversible capacity of>900 mAh/***,it is revealed that the native oxidation PO_(x)components of the CuP_(2)/C composite show higher electrochemical reversibility than the bulk Cu P_(2),based on a quantitative analysis of high-resolution solid-state^(31)P NMR,ex-situ XPS and synchrotron X-ray diffraction characterization *** sodiation products Na_(3)PO_(4) and Na_(4)P_(2)O_(7) derived from PO_(x) could react with Na-P alloys and regenerate to PO_(x) during charge process,which probably accounts for the high reversible capacity of the Cu P_(2)/C *** findings also illustrate that the phosphorus transforms into nanocrystalline Na_(3)P and Na_(x)P alloys,which laterally shows crystallization-amorphization evolution process during cycling.

关键词： CuP_(2)/C composite POx component Reaction mechanism Solid-state NMR Sodium-ion batteries

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