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EFFECT OF MEAN STRESS ON FATIGUE PERFORMANCE OF WELDED JOINTS TREATED BY UPT

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Chinese Journal of Mechanical Engineering 2004年第4期17卷 531-533页

作者： WangDongpo HuoLixing wangting LiJie ZhangYufeng DepartmentofMaterialEngineering TianjinUniversityTianjin300072China

The fatigue contrast tests of unload longitudinal direction comer joints asoriginal welded and treated by ultrasonic peening of Q235B in various stress ratio are directed. Theimprovements of fatigue performance of unload longitudinal direction corner joints resulted byultrasonic peening are studied. The effect pattern of stress ratio on fatigue performance of weldedjoints that are treated by ultrasonic peening is studied. As tests results indicate that: ① In thecondition of stress ratio .R=-l, the fatigue strength 'of specimen treated by ultrasonic peening isincreased by 165 percent of that of the original welded specimen. And the fatigue life of specimentreated by ultrasonic peening is as much as 75 approx 210 times of that of the latter. When R=0.1,the fatigue strength is increased by 87 percent and the fatigue life is extended by 21 approx 29times. When R=-0.5, the fatigue strength is increased by 123 percent and the fatigue life isextended by 42 approx 59 times. When R=0.45, the fatigue strength is increased by 51 percent and thefatigue life is extended by 3 approx 14 times. ② If the welded joints are treated by ultrasonicpeening, the fatigue strength is no longer independent on the applied mean stress. The more thestress ratio R, the less the fatigue stress range which can be sustained by the joints is. ③Whether the high value residual stress is in the joints or not, the dead load portion of the appliedload must be considered in the design of the joints which should be treated by ultrasonic peening.

关键词： Ultrasonic peening Welded joints Fatigue performance Mean stress

Exotic Structures of Odd-A Carbon Isotopes in the Deformed Relativistic Mean-FieldTheory

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Communications in Theoretical Physics 2004年第1期41卷 79-88页

作者： JIANGWei-Zhou RENZhong-Zhou ZHUZhi-Yuan wangting-Tai HEZe-Jun ShanghaiInstituteofNuclearResearch theChineseAcademyofSciencesShanghai201800ChinaCenterofTheoreticalNuclearPhysicsNationalLaboratoryofHeavyIonAcceleratorLanzhou730000China DepartmentofPhysics NanjingUniversityNanjing210093China ShanghaiInstituteofNuclearResearch theChineseAcademyofSciencesShanghai201800China

We study contributions of the pion meson and spatial component of the omega meson in the odd-A carbon isotopes. The pion and spatial omega provide small attractions in odd-A nuclei, giving rise to considerable influences on the single-particle energies rather than the bulk properties such as total binding energies, and root-mean-square (rms) radii. The ±? (spin) splittings, arising from the spatial omega, are large in 11C and 13C and drop as the isospin rises in odd-A carbon isotopes. As an isovector, the pion can shift slightly the relative potential depth of neutron and proton, contrary to the role of the rho meson. There is a general trend that both the pion and spatial omega fields reduce with the rise of isospin in the isotopic chain. From the normal nucleus to halo nucleus, an abnormal drop of the pion or spatial omega field may occur, as can be seen in 19C, 15C, and 21C.

关键词： halo nuclei relativistic mean-field theory

Terahertz propagation in metal templates

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Nuclear Science and Techniques 2004年第2期15卷 86-88页

作者： HANJia-Guang ZHANGWei ZHUZhi-Yuan WANGZhen-Xia YULi-Ping SUNLi-Tao wangting-Tai ShanghaiInstituteofAppliedPhysics theChineseAcademyofSciencesShanghai201800

Terahertz (THz) propagation in a metal template has been theoretically demonstrated. The possible propagating frequencies and power transmittance have been calculated. The power transmittance curves are displayed with different incident frequency and different geometric parameters. The oscillations of transmittance dependent on length of the template and the theoretical propagating bandwidth have been found.

关键词：金属样板传播频率功率透射率兆兆赫技术波导管

In_2O_3 Ultrafine Powder Synthesis by Sol0Gel Method

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Journal of Shanghai University(English Edition) 2001年第4期5卷 331-333页

作者： wangting－fu PANQing－yi 等 SchoolofScience ShanghaiUniversityShanghai200436China

The precursor of ultrafine In 2O 3 powder was prepared by the hydrolysis, peptization and gelation of InCl 3·4H 2O used as raw material. After calcination, ultrafine In 2O 3 powder was obtained. The particles were characterized by the methods of thermo gravimetric and differential thermal analysis (TG DTA), X ray diffractometry (XRD) and transmission electron microscopy (TEM), respectively.

关键词： In 2O 3 ultrafine powder sol gel method

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MMF:Outlook for 2007

China Textile 2007年第4期 50-51页

作者： wangting

As experts estimated that MMF industry in China has already stepped into a new uptrend period

关键词： Outlook MMF PTA

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Having on Pineapple

China Textile 2007年第4期 54-55页

作者： wangting

January 13th,2007,in CEBU,Philippines,the 12th ASEAN summit-focused attention not only on those Southeast Asian

关键词： Having on Pineapple

A continuous simulation of Holocene effective moisture change represented by variability of virtual lake level in East and Central Asia

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Science China Earth Sciences 2020年第8期63卷 1161-1175页

作者： Yu LI Yuxin ZHANG Xinzhong ZHANG wangting YE Lingmei XU Qin HAN Yichan LI Hebin LIU Simin PENG Key Laboratory of Western China s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesCenter for Hydrologic Cycle and Water Resources in Arid RegionLanzhou UniversityLanzhou 730000China

The fluctuation of a single lake level is a comprehensive reflection of water balance within the basin, while the regional consistent fluctuations of lake level can indicate the change of regional effective moisture. Previous researches were mainly focused on reconstructing effective moisture by multiproxy analyses of lake sediments. We carried out a series of experiments, including a transient climate evolution model, a lake energy balance model and a lake water balance model to simulate continuous Holocene effective moisture change represented by variability of virtual lake level in East and Central *** virtual lake level, area, water depth and salinity are not equivalent to actual values, but we estimated relative changes of the regional effective moisture. We also explored the driving mechanisms of effective moisture change in different geographical regions. Our results indicated that gradually falling effective moisture during the Holocene in northern China was due to the combined effects of high lake evaporation caused by longwave and shortwave radiation, and low precipitation caused by reductions of summer solar insolation. A decline in effective moisture through the Holocene in the Tibetan Plateau and southern Central Asia resulted from decreased precipitation because of the weakening of the Asian summer monsoon. Increased precipitation induced by the strengthening of the westerly circulation contributed to the effective moisture rise during the Holocene in northern Central Asia.

关键词： Effective moisture Virtual lake level Continuous simulation Holocene Solar radiation

Promoted catalytic performance of Ag-Mn bimetal catalysts synthesized through reduction route

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Journal of Environmental Sciences 2024年第3期137卷 358-369页

作者： Wenkai Hu Tao Guo Kaiyao Ma Xu Li wangting Luo Mingzhi Wu Hao Guo Yaxin Zhang Wenfeng Shangguan School of Chemical Engineering and Technology Xinjiang UniversityUrumchi 830017China Research Center for Combustion and Environmental Technology Shanghai Jiao Tong UniversityShanghai 200240China

VOCs can exert great harm to both human and environment,and catalytic oxidation is believed to be an effective technique to eliminate these *** this paper,Ag-Mn bimetal catalysts with 10 wt.%of silver were synthesized using doping,impregnation,and reduction methods respectively,and then they were applied to the catalytic oxidation of *** series of characterizations it showed that the loading of silver using reduction method significantly resulted in improved physico-chemical properties of manganese oxides,such as larger surface area and pore volume,higher proportion of surface Mn~(3+)and Mn~(4+),stronger reducibility and more active of surface oxygen species,which were all beneficial to its catalytic *** a result,the Ag-Mn catalysts synthesized by reduction method showed a lower T_(90)value(equals to the temperature at which 90%of initial benzene was removed)of 203℃.Besides,both the used and fresh Ag-Mn catalysts synthesized by reduction method showed preferable stability in this research.

关键词： Ag-Mn Benzene oxidation Catalytic performance Reduction route

Highlight Anhui:Gained＄8.4 b Investment in May

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China Textile 2007年第6期 40-41页

作者： wangting

About 4,700 domestic and overseas visitors,106 Fortune 500 enterprises, 530 investment projects...central China became eye-catching again in May,during the day of May 18th to 20th,2007,another expo feast-the Investment & Trade EXPO 2007 Anhui China was held in the city of Hefei,in Anhui province ebulliently authorized by the People’s Government of Anhui Province,which aims at exerting the EXPOCA brand,fully presenting the favorable investment environment of Anhui,strengthening the economic and technical cooperation between Anhui and abroad,broadening the opening up and promoting the great-leap-forward development of Anhui.

关键词： In Highlight Anhui b Investment in May