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Numerical Simulation of Temperature Distribution and ThermalStress Field in a Turbine Blade with Multilayer-Structure TBCs by a Fluid–Solid Coupling Method

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Journal of Materials Science & Technology 2016年第5期32卷 452-458页

作者： w.z.tang L.Yang w.zhu Y.C.zhou J.w.Guo C.LU Key Laboratory of Key Film Materials and Application for Equipment(Hunan Province) School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China Hunan Provincial Key laboratory of Thin Film Materials and Devices School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China School of Mechanical Engineering Xiangtan University Xiangtan 411105China Department of Mechanical Engineering Curtin UniversityPerthWA 6845Australia

To study the temperature distribution and thermal-stress field in different service stages, a two-dimensional model of a turbine blade with thermal barrier coatings is developed, in which the conjugate heat transfer analysis and the decoupled thermal-stress calculation method are adopted. Based on the simulation results, it is found that a non-uniform distribution of temperature appears in different positions of the blade surface, which has directly impacted on stress field. The maximum temperature with a value of 1030 ℃ occurs at the leading edge. During the steady stage, the maximum stress of thermally grown oxide （TGO） appears in the middle of the suction side, reaching 3.75 GPa. At the end stage of cooling, the maximum compressive stress of TGO with a value of-3.5 GPa occurs at the leading edge. Thus, it can be predicted that during the steady stage the dangerous regions may locate at the suction side, while the leadine edge mav be more Drone to failure on cooling.

关键词： Thermal barrier coatings Temperature distribution Thermal-stress field Conjugate heat transfer Decoupled thermal-stress calculation Fluid–solid coupling

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消毒副产物中的氯原子对其分子描述符的影响

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环境科学 2000年第5期21卷 51-54页

作者：蒋展鹏杨宏伟管运涛 w.z.tang A.J.Pierotti 清华大学环境科学与工程系美国佛罗里达国际大学土木与环境工程系

分析消毒副产物中氯原子数对分子描述符 ,辛醇 /水分配系数 L og P、最低空轨道能量 L UMO、前线轨道能量 HOMO、HO-MO- L UMO(ΔE)以及偶极矩的影响 .结果表明不同种类化合物对不同分子描述符的影响是不同的 ,其中以 L og P和 L UMO对... 详细信息

分析消毒副产物中氯原子数对分子描述符 ,辛醇 /水分配系数 L og P、最低空轨道能量 L UMO、前线轨道能量 HOMO、HO-MO- L UMO(ΔE)以及偶极矩的影响 .结果表明不同种类化合物对不同分子描述符的影响是不同的 ,其中以 L og P和 L UMO对氯原子数的相关性较好 ,HOMO次之 ,ΔE和偶极矩最差 .

关键词：消毒副产物氯原子数分子描述符饮用水

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氯化度对饮用水中消毒副产物安全标准的影响

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给水排水 2000年第1期26卷 22-25页

作者：杨宏伟蒋展鹏管运涛 w.z.tang A.J.Pierotti 清华大学环境科学与工程系美国佛罗里达国际大学土木与环境工程学系

研究了７种消毒副产物的单变量毒性ＱＳＡＲ模型。毒性指标采用了３种毒性安全标准，包括ＬＴＥＣ，ＬＴＥＡ和ＲｆＤ；分子描述符采用了３个物理化学常数，包括ｌｏｇＰ，ＨＯＭＯ，ＬＵＭＯ。分别研究了３个分子描述符与３个... 详细信息

研究了７种消毒副产物的单变量毒性ＱＳＡＲ模型。毒性指标采用了３种毒性安全标准，包括ＬＴＥＣ，ＬＴＥＡ和ＲｆＤ；分子描述符采用了３个物理化学常数，包括ｌｏｇＰ，ＨＯＭＯ，ＬＵＭＯ。分别研究了３个分子描述符与３个毒性安全标准之间的相关性，并得出了各自的ＱＳＡＲ方程。

关键词：消毒副产物 QSAR模型毒性安全标准

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利用神经网络模型建立有机物厌氧生物降解性定量结构关系

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给水排水 2002年第4期28卷 10-13页

作者：欧阳军杨宏伟蒋展鹏师绍琪 w.z.tang 清华大学环境科学与工程系 100084 美国佛罗里达国际大学土木与环境工程系

利用三层前馈型BP神经网络 ,对试验测得的有机物厌氧生物降解性的定量指数和有机物分子连接性指数进行建模 ,得到有机物厌氧生物降解性定量结构关系 (QSBR)模型。探索了新的QSBR建模方法。

关键词： QSBR 神经网络模型有机物厌氧生物降解性定量结构关系

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Dynamic Deformation of Frozen Soil at a High Strain Rate:Experiments and Damage-Coupled Constitutive Model

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Acta Mechanica Solida Sinica 2021年第6期34卷 895-910页

作者： z.w.zhu w.R.tang G.z.Kang Applied Mechanics and Structural Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu610036China Northwest institute of Eco-Environment and Resources State Key Laboratory of Frozen Soil EngineeringChinese Academy of SciencesLanzhou730000China

The dynamic compressive deformation of frozen soil was investigated by conducting the split-Hopkinson pressure bar(SHPB)experiments at three temperatures and different high strain rates,and the dynamic stress–strain responses and failure modes of the frozen soil were *** experimental results demonstrate that the frozen soil exhibits evident dependence on the strain rate and temperature under the dynamic loading *** dynamic compressive stress–strain curve of the frozen soil was divided into three parts:the linear,nonlinear rising,and strain softening *** nonlinear rising and strain softening parts were both caused by the damage attributed to the debonding between the ice particles and soil matrix,from which a rate-dependent damage evolution equation was ***,a damage-coupled dynamic viscoelastic constitutive model of frozen soil at high strain rate was derived.A comparison between the theoretically predicted results and the experimental ones showed that the developed dynamic viscoelastic model could well describe the dynamic mechanical behavior of frozen soil at high strain rate.

关键词： Frozen soil Dynamic compression High strain rate Damage Constitutive model

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Dynamic experiment and numerical simulation of frozen soil under confining pressure

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Acta Mechanica Sinica 2020年第6期36卷 1302-1318,I0004页

作者： w.R.tang z.w.zhu T.T.Fu z.w.zhou z.H.Shanggua Applied Mechanics and Structural Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu610036China Northwest Institute of Eco-Environment and Resources State Key Laboratory of Frozen Soil EngineeringChinese Academy of SciencesLanzhou730000China

with the development of cold region engineering,it is crucial to study the mechanical properties of frozen *** practice,frozen soil is inevitably subject to impact loading,making the study of frozen soil under impact loading necessary for engineering in cold *** split–Hopkinson pressure bar(SHPB)is an important experimental means for obtaining the dynamic performance of *** this study,an SHPB experiment was conducted on frozen soil under confining *** frozen soil exhibited an evident strain rate effect and temperature effect under confining *** SHPB experiment on frozen soil under confining pressure was simulated numerically using LS-DYNA software and the Holmquist–Johnson–Cook(HJC)material model.A loading simulation with passive confining pressure and active confining pressure was completed by adding an aluminum sleeve and applying a constant *** simulation results obtained using the above methods were in good agreement with the experimental *** strength of the frozen soil under confining pressure was greater than that of the uniaxial impact,and there was an evident confining pressure ***,the confining pressure provided by passive confinement was larger than that provided by active *** passive confining pressure energy absorption efficiency was higher than for the active confining pressure due to the need to absorb more energy under the same damage *** frozen soil exhibited viscoplastic failure characteristics under confining pressure.

关键词： Frozen soil-Dynamic experiment Confining pressure Split-Hopkinson pressure bar Numerical simulation

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Electron localization of H_2^+ in a dc electric field

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Chinese Physics B 2017年第1期26卷 170-175页

作者： z M Jia z N zeng w T tang R X Li State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Signal and Information Processing Jingchu University of Technology Jingmen 448000 China

A dc electric field is utilized to steer the electron motion after the molecular ion H2-＋ is excited by an ultrashort ultraviolet laser pulse. The numerical simulation shows that the electron localization distribution and the dissociation control ratio are dependent on the polarization direction and amplitude of the dc electric field. Most electrons of the dissociation state move opposite to the dc electric field and stabilize at the dressed-up potential well, for the dressed-down well is occupied by the electrons of the 1 sσg state.

关键词： dissociation localization time dependent Schrdinger equation Coulomb potential ultraviolet laser pulse

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Surface modification of tungsten oxide by oxygen vacancies for hydrogen adsorption

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Journal of Materials Science & Technology 2022年第22期117卷 23-35页

作者： Q.zhang F.w.tang z.zhao z.R.Nie X.Y.Song Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China

A model for describing the adsorption process of hydrogen on surface of tungsten oxide was proposed based on the first-principle calculations. Multiple factors such as type of active surface, adsorption site and distribution of oxygen vacancies were considered to evaluate the hydrogen adsorption capability of tungsten oxide. The adsorption Gibbs free energies, electronic structures and bonding characteristics under various conditions were examined to reveal the influence of oxygen vacancies on the surface. It is found that the capability of hydrogen adsorption of tungsten oxide can be significantly enhanced by adjusting the oxygen vacancy on the outermost layer of certain active surfaces. The modeling predicts that the surface structure stability and gas adsorption ability of tungsten oxide can be simultaneously improved through the formation of w–H bonds. The proposed strategy for moderating surface provides a new approach to obtain excellent gas-sensitive metal oxide materials.

关键词： Metal oxide Gas-sensitive material Surface adsorption Oxygen vacancy First-principles calculation

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Improving the strength and SCC resistance of an Al-5Mg-3zn alloy with low-angle grain boundary structure

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Journal of Materials Science & Technology 2023年第30期161卷 63-73页

作者： z.C.tang w.Xu D.Y.zhao B.zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The strength of traditional Al-Mg alloys is relatively low because it mainly relies on solid solution *** a third component to form precipitation can improve their strength,but it usually leads to high-stress corrosion cracking(SCC)sensitivity due to the formation of high-density precipitates at grain boundaries(GBs).So far,it is still challenging to improve the strength of Al-Mg alloys without re-ducing SCC ***,a nanostructured Al-5Mg-3 zn alloy with a good yield strength of 336 MPa and good elongation was successfully *** dynamic plastic deformation and appropriate anneal-ing treatment,near-equiaxed nanograins were introduced in the nanostructured Al-5Mg-3 zn alloy with a high proportion(71%)of the low-angle grain *** statistical investigations show that the pre-cipitation of active T’phase at GBs has been greatly suppressed in the nanostructured Al-5Mg-3 zn alloy at sensitized conditions,and the area fraction of GB precipitates is reduced from 72%to 21%,which sig-nificantly decreases the SCC *** study provides guidance for developing advanced Al-Mg alloy with high SCC resistance.

关键词： Al-5Mg-3 zn alloy Stress corrosion cracking Low angle grain boundary Nanostructured Dynamic plastic deformation

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BOUNDARY ELEMENT APPROXIMATION OF STEKLOV EIGENVALUE PROBLEM FOR HELMHOLTz EQUATION

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Journal of Computational Mathematics 1998年第2期16卷 165-178页

作者： tang, wJ Guan, z Han, HD Inst Appl Phys & Computat Math Lab Computat Phys Beijing 100088 Peoples R China Tsing Hua Univ Dept Appl Math Beijing 100084 Peoples R China

Steklov eigenvalue problem of Helmholtz equation is considered in the present paper. Steklov eigenvalue problem is reduced to a new variational formula on the boundary of a given domain, in which the self-adjoint property of the original differential operator is kept and the calculating of hyper-singular integral is avoided. A numerical example showing the efficiency of this method and an optimal error estimate are given.

关键词： Steklov eigenvalue problem differential operator error estimate boundary element approximation

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