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Mechanical and fatigue properties of self-piercing riveted joints in high-strength steel and aluminium alloy

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Journal of Iron and Steel Research International 2017年第2期24卷 214-221页

作者： Chun-yu Zhang rui-bin gou Min Yu Ya-jing Zhang Yin-hu Qiao Shu-ping Fang School of Mechanical Engineering Anhui Science and Technology University Chuzhou 233100 Anhui China College of Architecture Anhui Science and Technology University Chuzhou 233100 Anhui China

Static tensile and fatigue tests were performed on shear and tensile self-piercing riveted aluminium-steel structures to evaluate their mechanical and fatigue properties. The influences of the thickness and the strength of the high strength steel on mechanical and fatigue performances were investigated based on the tensile and F-N curves of the joints. The results show that mechanical and fatigue properties of the shear self-piercing riveted joints are much better than those of the tensile self-piercing riveted joints. Mechanical and fatigue performances of the two joints were significantly influenced by the thickness and strength of the steel sheet, and were markedly improved when the thickness of steel sheet increased. The steel strength showed significantly different effects on shear and tensile riveted structures, i. e. , when the steel strength increased, the strength of the shear structure greatly increased while the tensile structure just had a slight increase in the strength. Fatigue failure generally occurred in the sheet materials and the fatigue crack location changed with increasing the sheet thickness and the sheet strength.

关键词： High-strength steel Tensile test Fatigue test Selbpiercing riveting Tensile strength Fatigue strength Aluminium alloy

Microstructure failure in ferrite-martensite dual phase steel under in-situ tensile test

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Journal of Iron and Steel Research International 2017年第3期24卷 350-356页

作者： rui-bin gou Wen-jiao Dan Wei-gang Zhang Min Yu Chun-yu Zhang Yin-hu Qiao Lu Ma Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China School of Mechanical Engineering Anhui Science and Technology University Bengbu 233100 Anhui China Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong University Shanghai 200240 China College of Architecture Anhui Science and Technology University Bengbu 233100 Anhui China

To investigate microstructure failure in ferrite-martensite dual phase steel,in-situ observations were performed on multiple plate DP800 specimens during uniaxial tensile tests. Microstructure evolution of the observed region was investigated in details. The experimental data showed that micro-cracks in various regions differed in the initiation time,and micro-failures mainly occurred from the locations with typical characteristics of stress concentration（ i. e. ferrite interiors,the interfaces of ferrite-martensite grains and the martensite-martensite interfaces）. Growth of micro-crack generally experienced the following stages： cracking from martensite boundaries,tiny particles in ferrite interiors,or martensite interiors,propagating in ferrite,bypassing martensite boundaries,or passing through martensite-martensite interfaces,finally ending on martensite boundaries. Martensite was one important source of micro-failure and changed the propagation of micro-cracks significantly. Microstructure deformation was inhomogeneous in the stage of plastic deformation.

关键词： Micro-fracture Dual phase steel Ferrite Martensite In-situ observation

Imidazolium-based ionic polymers for fast and efficient anion-exchange driven capture of Cr2O72-

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Science China Chemistry 2025年

作者： Yishou Wang Xiaonan Yuan Xingxing gou Xiatian Song Xiaogang Wang Ling Guo Yanfeng Liu Chengfang Qiao Chunsheng Zhou Yingfeng Han Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials College of Chemical Engineering and Modern Materials Shangluo University Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Xi'an Key Laboratory of Functional Supramolecular Structure and Materials College of Chemistry and Materials Science Northwest University

The pervasive issue of chromium（VI） contamination,particularly in dichromate (Cr2O2-7),resulting from unchecked industrial growth and inadequate waste management,remains a pressing concern that demands immediate and dedicated ***,we present two novel imidazolium-based ionic polymers （ImIPs）.The ImIPs boast a highly cationic structure rich in bromide（Br-） ions and exhibit remarkable porosity,facilitating the easy exchange of these ions for chromate (Cr2O2-7) through anion *** unique combination leads to exceptional performance,including a high adsorption capacity （423 mg/g）,rapid adsorption rate (75 mg g-1min-1),and a broad operational pH range （2–12）.Moreover,our material demonstrates remarkable reusability,maintaining its efficacy even after 10 cycles without significant loss of *** mechanistic studies underscore the role of ion-exchange chemistry in effectively removing dichromate by the presented ImIPs,providing strong evidence for their suitability as a robust solution to address the ongoing challenges in water *** findings represent a crucial step in developing advanced materials for tackling chromium（VI） pollution.

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Effect of pontoons on free surface elevation around a TLP platform

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Science China(Technological Sciences) 2014年第1期57卷 163-180页

作者： CONG PeiWen gou Ying TENG bin State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

Tension leg platform(TLP)is a typical compliant offshore structure for oil/gas resources *** the design process,the prediction of the free surface elevation is of great importance for the determination of the air *** far,the existing researches for predicting the air gap of the TLPs focus on the supporting columns while pay little attention to the horizontal *** the second order diffraction problem or long incident wave condition,the velocity potential decays slowly with water depth and the effect of pontoons should not be *** the effect of pontoons on the diffracted wave field in the vicinity of a TLP platform is investigated in this *** diffraction of regular waves by a square array of truncated cylinders and a whole TLP structure is studied in detail by using both the linear and the second-order diffraction *** calculation is performed for the free surface elevation and wave run *** results show that the near-trapping phenomenon can occur inside the TLP and leads to significantly increased wave *** study the effect of pontoons on the free surface elevation comparisons are carried out between the results of these two structures with and without *** is found that pontoons have an appreciable effect on the diffracted wave field for long incident regular waves and increase the largest response notably when the near-trapping phenomenon occurs at the second-order.

关键词： TLP pontoon free surface elevation near-trapping the second-order diffraction

A 9×9 matrix representation of Temperley-Lieb algebra and corresponding entanglement

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Chinese Physics B 2012年第2期21卷 94-97页

作者： gou Li-Dan Zhu rui-Han School of Science Changchun University of Science and TechnologyChangchun 130022China

We present the matrix U. The 9 × 9 U matrix is a representation of specialized Temperley-Lieb algebra. Based on which, a unitary R matrix is generated via the Yang-Baxterization approach. The 9 × 9 R matrix, a so... 详细信息

关键词： Temperley-Lieb algebra. Yang-Baxter equation entanglement

A new ensemble-based classifier for IGBT open-circuit fault diagnosis in three-phase PWM converter

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Protection and Control of Modern Power Systems 2018年第1期3卷 373-381页

作者： Yang Xia bin gou Yan Xu Electric Power Research Laboratory School of Electrical and Electronic EngineeringNanyang Technological UniversityS2.2 B750 Nanyang AvenueSingapore 639798Singapore

Three-phase pulse width modulation converters using insulated gate bipolar transistors(IGBTs)have been widely used in industrial ***,faults in IGBTs can severely affect the operation and safety of the power electronics equipment and *** ensuring system reliability,it is necessary to accurately detect IGBT faults accurately as soon as their *** paper proposes a diagnosis method based on data-driven theory.A novel randomized learning technology,namely extreme learning machine(ELM)is adopted into historical data *** classifier structure is used to improve diagnostic ***,time window is defined to illustrate the relevance between diagnostic accuracy and data sampling *** this mean,an appropriate time window is achieved to guarantee a high accuracy with relatively short decision *** to other traditional methods,ELM has a better classification *** tests validate the proposed ELM ensemble diagnostic performance.

关键词： IGBT open-circuit fault Extreme learning machine(ELM) Data-driven method Ensemble structure

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高铁路基振动压实机-土耦合系统动力学分析

Recyclable Technology of Thermosetting Resins for High Thermal Conductivity Materials Based on Physical Crushing

工程力学 2025年第1期42卷 241-248页

作者：叶阳升尧俊凯蔡德钩魏文彬王柯中国铁道科学研究院铁道建筑研究所北京100081 哈尔滨工业大学土木工程学院哈尔滨150090

压路机连续压实系统根据振动压实过程中振动轮响应评价压实质量，并根据土体压实质量反馈调节压路机工作参数。基于集中参数模型引入塑性弹簧，将压实过程分为弹性、弹塑性、分离三阶段;分别建立三阶段动力学控制方程，依据轮-土相对位... 详细信息

压路机连续压实系统根据振动压实过程中振动轮响应评价压实质量，并根据土体压实质量反馈调节压路机工作参数。基于集中参数模型引入塑性弹簧，将压实过程分为弹性、弹塑性、分离三阶段;分别建立三阶段动力学控制方程，依据轮-土相对位移与作用力确定各阶段切换条件;采用现场实测数据验证模型可靠性;揭示激振力特性(激振力幅值、激振频率)和土体参数的振动响应规律。结果表明：激振力幅值不变时，振动轮振幅和分离周期随激振频率的增大而减小。激振频率不变时，振动轮振幅和分离周期随着激振频率的增大而增大。当激振力幅值与激振频率不变，振动轮振幅随着土体动剪切模量的提升而降低，土体动剪切模量较小时，土体以塑性变形为主。土体动剪切模量较大时，土体以弹性变形为主，振幅缓慢下降，直至趋于平缓。

关键词：高铁路基路基压实振动压实机土耦合动力学系统

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Energy & Environmental Materials 2024年第6期7卷 378-387页

作者： An Zhong Congzhen Xie bin gou Jiangang Zhou Huasong Xu Song Yu Daoming Zhang Chunhui Bi Hangchuan Cai Licheng Li rui Wang School of Electric Power South China University of TechnologyGuangzhou 510641China

Epoxy resin,characterized by prominent mechanical and electric-insulation properties,is the preferred material for packaging power electronic ***,the efficient recycling and reuse of epoxy materials with thermally cross-linked molecular structures has become a daunting ***,we propose an economical and operable recycling strategy to regenerate waste epoxy resin into a high-performance *** particle size of waste epoxy micro-spheres(100–600μm)with core-shell structure is obtained through simple mechanical crushing and boron nitride surface *** using smattering epoxy monomer as an adhesive,an eco-friendly composite material with a“brick-wall structure”can be *** continuous boron nitride pathway with efficient thermal conductivity endows eco-friendly composite materials with a preeminent thermal conductivity of 3.71 W m^(−1)K^(−1) at a low content of 8.5 vol%h-BN,superior to pure epoxy resin(0.21 W m^(−1)K^(−1)).The composite,after secondary recycling and reuse,still maintains a thermal conductivity of 2.12 W m^(−1)K^(−1) and has mechanical and insulation properties comparable to the new epoxy resin(energy storage modulus of 2326.3 MPa and breakdown strength of 40.18 kV mm^(−1)).This strategy expands the sustainable application prospects of thermosetting polymers,offering extremely high economic and environmental value.

关键词： brick-wall structure epoxy thermosetting physical recycling thermal management

Wave Radiation by A Submerged Ring Plate in Water of Finite Depth

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China Ocean Engineering 2019年第6期33卷 660-672页

作者： CONG Pei-wen LIU Ying-yi gou Ying TENG bin State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Department of Civil and Environmental Engineering National University of Singapore117576Singapore Research Institute for Applied Mechanics Kyushu UniversityKasugaFukuoka 816-8580Japan

A plate submerged at a certain depth underneath the sea surface has been proposed as a structure type for different purposes, including motion response reduction, wave control, and wave energy harvesting. In the present study, the three-dimensional wave radiation problem is investigated in the context of the linear potential theory for a submerged ring plate in isolation or attached to a floating column as an appendage. In the latter case, the ring plate is attached at a certain distance above the column bottom. The structure is assumed to undergo a heave motion. An analytical model is developed to solve the wave radiation problem via the eigenfunction expansion method in association with the region-matching technique. With the velocity potential being available, the hydrodynamic coefficients, such as added mass and radiation damping, are obtained through the direct pressure integration. An alternative solution of radiation damping has also been developed in this study, in which the radiation damping is related to the Kochin function in the wave radiation problem. After validating the present model, numerical analysis is performed in detail to assess the influence of various plate parameters, such as the plate size and submergence depth. It is noted that the additional added mass due to the attached ring plate is larger than that when the plate is in isolation. Meanwhile, the radiation damping of the column for the heave motion can vanish at a specific wave frequency by attaching a ring plate, corresponding to a condition that there exist no progressive waves in the exterior region.

关键词： compound structure hydrodynamic coefficients ring plate zero radiation damping