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Simulation on Residual Stress of Shot Peening Based on a Symmetrical Cell Model

Chinese Journal of Mechanical Engineering 2017年第2期30卷 344-351页

作者： Cheng WANG Jiacheng HU Zhenbiao GU Yangjian XU xiaogui WANG College of Mechanical Engineering Zhejiang University ofTechnologyHangzhou 310014China

The symmetrical cell model is widely used to study the residual stress induced by shot peening. However, the correlation between the predicted residual stresses and the shot peening coverage, which is a big challenge for the researchers of the symmetrical cell model, is still not established. Based on the dynamic stresses and the residual stresses outputted from the symmetrical cell model, the residual stresses corresponding to full coverage are evalu- ated by normal distribution analysis. The predicted nodal dynamic stresses with respect to four corner points indicate that the equi-biaxial stress state exists only for the first shot impact. Along with the increase of shot number, the interactions of multiple shot impacts make the fluctuation of the nodal dynamic stresses about an almost identical value more and more obvious. The mean values and standard deviations of the residual stresses gradually tend to be stable with the increase of the number of shot peening series. The mean values at each corner point are almost the same after the third peening series, which means that an equi-biaxial stress state corresponding to the full coverage of shot peening is achieved. Therefore, the mean values of the nodal residual stresses with respect to a specific transverse cross-section below the peened surface can be used to correlate the measured data by X-ray. The predicted residual stress profile agrees with the experimental results very well under 200% peening coverage. An effective correlation method is proposed for the nodal residual stresses predicted by the symmetrical cell model and the shot peening coverage.

关键词： Residual stress Symmetrical cell model Equi·biaxial stress state Shot peening coverage Dynamic stress

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Amino-functionalized magnetic bacterial cellulose/activated carbon composite for Pb^2＋ and methyl orange sorption from aqueous solution

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Journal of Materials Science & Technology 2018年第5期34卷 855-863页

作者： xiaogui Huang Xiaozhang Zhan Cuilian Wen Feng Xu Lijin Luo College of Materials Science and Engineering Fuzhou University Fuzhou 350116 China Key Laboratory of eco-Materials Advanced Technology (Fuzhou University) Fujian Province University Fuzhou 350116 China Fujian Provincial Key Laboratory of Screening for Novel Microbial Products Fujian Institute of Microbiology Fuzhou 350007 China

A new nanostructured amino-functionalized magnetic bacterial cellulose/activated carbon（BC/AC）composite bioadsorbent（AMBCAC）was prepared for removal of Pb^2＋ and methyl orange（MO）from aqueous *** results demonstrated that the equilibrium adsorption capacity（qe）for Pb^2＋ obviously increases by 2.14 times after introduction of amino groups,the optimum p H for Pb^2＋and MO adsorption was 5.0 and 3.0,respectively,and the qeof AMBCAC was 161.78 mg g^-1 for Pb^2＋ and 83.26 mg g^-1 for MO under the optimal conditions in this *** kinetics and adsorption isotherm data of the sorption process were well fitted by pseudo-second-order kinetic model and Langmuir isotherm *** thermodynamic results（the Gibbs free energy change G〈0,the enthalpy change H〉0,the entropy change S〉0）implied that the adsorption process of Pb^2＋ and MO was feasible,endothermic and spontaneous in *** results support that the AMBCAC composite developed in this work can provide a cheap and efficient way for easy removal of both Pb^2＋ and MO as a promising adsorbent candidate for wastewater treatment.

关键词： Bacterial cellulose Activated carbon Pb^2+ Methyl orange Adsorption

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Multi-axial Fatigue of 2024-T4 Aluminum Alloy

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Chinese Journal of Mechanical Engineering 2011年第2期24卷 195-201页

作者： WANG xiaogui GAO Zengliang QIU Baoxiang WANG Limei JIANG Yanyao College of Mechanical Engineering Zhejiang University of Technology Hangzhou 310032 China Department of Mechanical Engineering University of Nevada Reno NV89557 USA

Only the fatigue initiation is considered by the safe-life design approach,while fatigue crack propagation is paid more attention by the damage tolerance *** reasonable fatigue design method and durability assessment standard should give these two phases equivalent *** develop a unified model of fatigue initiation and crack propagation,a great deal of baseline fatigue properties of a material should be obtained by fatigue ***,there is lack of thorough and comprehensive experiment study on the fatigue properties of 2024-T4 aluminum alloy,which is widely used as load-bearing components in aircraft *** this paper,strain-controlled uniaxial,torsion,and combined axial-torsion fatigue experiments are conducted on 2024-T4 aluminum alloy in ambient *** reversed uniaxial and pure torsion experiments employ solid cylindrical *** experiments under the fully reversed shear loading with a static axial stress,proportional axial-torsion loading,and 90°out-of-phase axial-torsion nonproportional loading are conducted by using thin-walled tubular *** experimental results show that the mean stress has a significant influence on the fatigue strength of the material.A tensile mean stress decreases the fatigue life dramatically,while a compressive mean stress increases the fatigue *** strain-life fatigue results obtained from the fully reversed uniaxial fatigue experiments can be represented by one smooth curve of a three-parameter ***,two fitting curves are needed for characterizing the results of the fully reversed pure torsion fatigue tests because of the existence of an obvious *** baseline fatigue properties of 2024-T4 aluminum alloy obtained from the fatigue experiments have applications for the fatigue design and safe assessment of engineering components.

关键词： 2024-T4 aluminum alloy fatigue life loading path multiaxial fatigue SWT fatigue parameter

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Light-Driven Oxidation of Pu(Ⅳ)to Pu(Ⅵ)Enables Green and Efficient Pu Recovery

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Chinese Journal of Chemistry 2021年第12期39卷 3399-3403页

作者： Xue Dong Zhipeng Wang Qiang Yan Jing Chen xiaogui Feng Chao Xu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Plutonium(Pu)is a key actinide in nuclear industry and is the only element in the periodic table known to date that could exist in four different oxidation states simultaneously in aqueous *** recovery of Pu in nuclear wastes relies greatly on the precise control of its oxidation ***,we introduce a light-driven oxidation approach that could effectively oxidize Pu(Ⅳ)to Pu(Ⅵ)in acidic solutions without the addition of extra chemical *** oxidation proceeds via the reaction of Pu(Ⅳ)with the oxidative species induced by UV light *** approach can help with the separation of Pu from other metals and can be further extended to a biphasic extraction system to achieve green and efficient stripping of Pu from an organic solvent.

关键词： Actinides Photooxidation Radiochemistry Plutonium Separation

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Expression and Antigen Activity Determination of Human Thyroid Peroxidase in Silkworm and Yeast

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Wuhan University Journal of Natural Sciences 2016年第6期21卷 531-536页

作者： GUO Baodang GAO Wanli Lü Huifang ZHANG Xiaoliang YAO xiaogui YAO Lunguang Henan Provincial Engineering Laboratory of Insects Bio-reactor Nanyang Normal University Nanyang 473000Henan China Autobio Diagnostics Company Limited Zhengzhou 450016Henan China Shaoyang Central Hospital Shaoyang 422000 HunanChina

In this study,we report the expression of human thyroid peroxidase（TPO） in silkworm larvae and Pichia pastoris GS115. Recombinant TPO is sequentially purified from the hemolymph of infected silkworm larvae and yeast using a Ni-NTA resin kit. The concentration of yield of recombinant TPO is 4.87 mg per thousand larvae and 40.83 mg per liter yeast culture. However,the recombinant TPO produced in silkworm show similar binding ability with the specific anti-TPO serum to standard human TPO purified from insect cells. The lower antigen activity indicates the TPO expressed in yeast is not suitable to be used as the coating antigen in enzyme linked immunosorbent assay（ELISA）. The cost of TPO expressed in B. mori is about 1/4 that of in insect cells,and the cost of TPO purified from silkworm for ELISA is only 1/8 that of TPO produced from Sf9 cells. It indicates the Bm NPV-silkworm expression system is a cost-effectiv e platform for producing TPO with high antigen activity.

关键词： human thyroid peroxidase silkworm larvae Pichia pastoris antigen activity cost effective

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从伐由到乌悉帕卡:中古祆教风神的印度风

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敦煌研究 2021年第3期 32-39页

作者：张小贵暨南大学历史系广东广州510632

阿维斯陀经中的风神伐由不仅是自然之风,更象征万物生命的气息。伐由传到中亚地区后,借鉴了当地的湿婆形象,变成了贵霜祆教风神乌悉。萨珊人征服巴克特里亚地区后,对乌悉形象进行了一系列改变,使他更接近了伐由的“琐罗亚斯德教”特征... 详细信息

阿维斯陀经中的风神伐由不仅是自然之风,更象征万物生命的气息。伐由传到中亚地区后,借鉴了当地的湿婆形象,变成了贵霜祆教风神乌悉。萨珊人征服巴克特里亚地区后,对乌悉形象进行了一系列改变,使他更接近了伐由的“琐罗亚斯德教”特征。三头乌悉的形象在粟特继续存在,称为乌悉帕卡,比伊朗本土的伐由地位更重要了。传到中土的乌悉帕卡以三尊神之一的形象出现,唐宋文献清楚地记载了这一披着湿婆外衣的祆教风神,生动再现了祆教与印度教、佛教之间的交流图景。

关键词：祆教伐由乌悉乌悉帕卡湿婆

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康国别院“令狗食人肉”辨

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西域研究 2007年第3期 77-85页

作者：张小贵广州暨南大学历史系

本文考察了狗在琐罗亚斯德教中的角色和功能,认为其在葬仪中主要负责驱除尸魔,而并不具备食死者尸肉的功能。中古时期,粟特祆教仍与波斯本土的琐罗亚斯德教保持联系,而且还就葬俗的方面进行请教。因此史载康国别院"令狗食人肉"并不可信... 详细信息

本文考察了狗在琐罗亚斯德教中的角色和功能,认为其在葬仪中主要负责驱除尸魔,而并不具备食死者尸肉的功能。中古时期,粟特祆教仍与波斯本土的琐罗亚斯德教保持联系,而且还就葬俗的方面进行请教。因此史载康国别院"令狗食人肉"并不可信,乃作者不了解当地风俗的误记。

关键词：祆教琐罗亚斯德教狗康国

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Application of Liquid Solid Semi-moving Bed to Fractionation of Cesium Ion in Wastewater

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Chinese Journal of Chemical Engineering 2007年第5期15卷 654-660页

作者：徐聪冯孝贵景山 Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

A liquid solid semi-moving bed with non-mechanical particle transport system is proposed and used for fractionation of cesium ion in wastewater. The particle transport system, which consists of a suction chamber, a mixing chamber, a nozzle and a riser tube, is designed to be controlled completely by hydraulic force. Experiments show that continuous feeding and discharging of resin can be realized by the transport system. The removal of cesium ion from wastewater is realized, The concentration of cesium ion in effluent liquid remains below 0,1g·L^-1 （the initial concentration is 5,3g·L^-1） during the 73 hours＇ experiment. The average exchange capacity of resin discharged from the bed is 0.57mmol,（g dry resin）^-1, which is close to the saturated capacity of 0.65mmol·g^-1. And it is also proved that the non-homogeneity of particle vertical velocity along the radial direction can seriously influence the ion-exchange process.

关键词： semi-moving bed ion-exchange wastewater disposal particle transport cesium ion

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