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| 1 | Finite Element Simulation on Thermal Fatigue of a Turbine Blade with Thermal Barrier Coatings显示文摘In this paper,a finite element model was developed for a turbine blade with thermal barrier coatings to investigate its failure behavior under cyclic thermal loading.Based on temperature and stress fields obtained from finite element simulations,dangerous regions in ceramic coating were determined in terms of the maximum principal stress criterion.The results show that damage preferentially occurs in the chamfer and rabbet of a turbine blade with thermal barrier coatings and its thermal fatigue life decreases with the increase of thermal stress induced by high service temperature. | L.Yang Q.X.Liu Y.C.Zhou W.G.Mao C.Lu | 2014 | Journal of Materials Science & Technology2014，30，4： | 15 |
| 2 | Numerical Simulation of Temperature Distribution and ThermalStress Field in a Turbine Blade with Multilayer-Structure TBCs by a Fluid–Solid Coupling Method显示文摘To study the temperature distribution and thermal-stress?eld in different service stages,a twodimensional 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?eld.The maximum temperature with a value of 1030°C 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 leading edge may be more prone to failure on cooling. | W.Z.Tang L.Yang W.Zhu Y.C.Zhou J.W.Guo C.LU | 2016 | Journal of Materials Science & Technology2016，32，5： | 15 |
| 3 | Electrically Conductive Honeycomb Monolith of Nanolaminated Ti_3AlC_2:Preparation and Characterization显示文摘Nanolaminated Ti_3AlC_2 honeycomb monolith with parallel and uniform holes has been prepared through a facile extrusion route by using Ti_3AlC_2 powder as the main raw material.The fabricated honeycomb monolith has high compressive strength of 133 ± 11 and 59 ± 9 MPa,along and perpendicular to the extrusion direction,respectively.It also has good electrical conductivity,and excellent match of thermal expansion coefficient with the washcoat material of γ-AI_2O_3.These combined properties endow the honeycomb monolith a promising candidate as catalysis substrate for cleaning vehicle exhaust. | X.M.Fang X.H.Wang H.Zhang Y.C.Zhou | 2015 | Journal of Materials Science & Technology2015，31，1： | 5 |
| 4 | First-principles Study of Point Defects in Stoichiometric and Non-stoichiometric Y_4Al_2O_9显示文摘By using the first-principles calculation,we studied the mechanisms of point defects in Y4Al2O9(YAM),a promising ternary oxide with excellent optical and thermal properties.It is found that the predominant native defect species is closely dependent on the chemical potentials of each constituent.In the case of O-rich condition,the oxygen interstitial has the very low defect formation energy,followed by the anti-site defects and Al vacancy;in the case of Al-rich condition,the oxygen vacancy yields the lowest defect formation energy,followed by the anti-site defects and Al interstitial.The present result shows that in all the possible chemical potential ranges,anti-site defects have relatively low defect formation energy and might exist in high concentration in YAM.Furthermore,AlY anti-site has relatively lower defect formation energy than the YAl antisite throughout.The behaviors of defect complexes under non-stoichiometric condition,such as the Al2O3or Y2O3excess,are also investigated.The results provide helpful guide to optimize the experimental synthesizing of YAM. | Z.Li B.Liu J.M.Wang L.C.Sun J.Y.Wang Y.C.Zhou Z.J.Hu | 2013 | Journal of Materials Science & Technology2013，29，12： | 2 |
| 5 | Evaluating high-temperature modulus and elastic recovery of Ti3SiC2 and Ti3AlC2 ceramics显示文摘 | Y.W.Bao Y.C.Zhou | | 0，，： | 1 |
| 6 | 查看详情显示文摘 | S.H.Xie J.Y.Li Y.Qiao Y.Y.Liu L.N.Lan Y.C.Zhou and S.T.Tan | | 0，，06： | 1 |
| 7 | 查看详情显示文摘 | S.H.Xie J.Y.Li Y.Y.Liu L.N.Lan G.Jin and Y.C.Zhou | | 0，，02： | 1 |
| 8 | 查看详情显示文摘 | S.H.Xie J.Y.Li R.Proksch Y.M.Liu Y.C.Zhou Y.Y.Liu Y.Ou L.N.Lan and Y.Qiao | | 0，，22： | 1 |
| 9 | Investigation of the relationship betw een elastic modulus and hardness based on depth-sensing indentation measurements显示文摘 | Y.W.Bao W.Wang Y.C.Zhou | 2004 | 2004，，： | 1 |
| 10 | 查看详情显示文摘 | W.G.Mao Y.C.Zhou | | 0，，： | 1 |
| 11 | 查看详情显示文摘 | S.H.Xie A.Gannepalli Q.N.Chen Y.M.Liu Y.C.Zhou R.Proksch J.Y.Li | | 0，，： | 1 |
| 12 | MECHANICAL PROPERTIES OF Ti_3SiC_2 AT HIGH TEMPERATURE显示文摘Creep and stress relaxation behavior, the elastic modulus and fracture toughness of machinable Ti3SiC2 at various temperatures from 20 to 1250℃ were investigated by means of three-point bending tests. The experiments were performed respectively at: (i) fixed stress and changed temperatures, and (ii) fixed temperature and changed stresses. A creep resistance parameter that represents the probability of creep deformation in a given condition was defined as a function of both applied stress and the threshold stress, varying in a range from 0 to 1. Elastic modulus at high temperatures was measured through comparing relative slopes of loading curves in cyclic loading curve. The fracture toughness measured by SENB method showed a stable value in the range of 25-1000℃, but over 1000℃, it declined abruptly from ~6.7MPa.m^1/2 to~2.0MPa.m^1/2 at 1200℃. | Y.W.Bao Y.C.Zhou | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，4： | 1 |
| 13 | Adaptive Finite Element Modeling Techniques for the Poisson-Boltzmann Equation显示文摘We consider the design of an effective and reliable adaptive finite element method(AFEM)for the nonlinear Poisson-Boltzmann equation(PBE).We first examine the two-term regularization technique for the continuous problem recently proposed by Chen,Holst and Xu based on the removal of the singular electrostatic potential inside biomolecules;this technique made possible the development of the first complete solution and approximation theory for the Poisson-Boltzmann equation,the first provably convergent discretization and also allowed for the development of a provably convergent AFEM.However,in practical implementation,this two-term regularization exhibits numerical instability.Therefore,we examine a variation of this regularization technique which can be shown to be less susceptible to such instability.We establish a priori estimates and other basic results for the continuous regularized problem,as well as for Galerkin finite element approximations.We show that the new approach produces regularized continuous and discrete problemswith the samemathematical advantages of the original regularization.We then design an AFEM scheme for the new regularized problem and show that the resulting AFEM scheme is accurate and reliable,by proving a contraction result for the error.This result,which is one of the first results of this type for nonlinear elliptic problems,is based on using continuous and discrete a priori L¥estimates.To provide a high-quality geometric model as input to the AFEM algorithm,we also describe a class of feature-preserving adaptive mesh generation algorithms designed specifically for constructing meshes of biomolecular structures,based on the intrinsic local structure tensor of the molecular surface.All of the algorithms described in the article are implemented in the Finite Element Toolkit(FETK),developed and maintained at UCSD.The stability advantages of the new regularization scheme are demonstrated with FETK through comparisons with the original regularization approach for a model problem.The convergence and accuracy of the overall AFEMalgorithmis also illustrated by numerical approximation of electrostatic solvation energy for an insulin protein. | M.Holst J.A.McCammon Z.Yu Y.C.Zhou Y.Zhu | 2012 | Communications in Computational Physics2012，11，1： | 0 |
| 14 | Coupled Effects of Temperature Gradient and Oxidation on the Thermal Barrier Coating Failure显示文摘 | Y.C.Zhou | 2000 | 材料科学与工程学报2000，20，z1： | 0 |
| 15 | Recent Progress in Numerical Methods for the Poisson-Boltzmann Equation in Biophysical Applications显示文摘Efficiency and accuracy are two major concerns in numerical solutions of the Poisson-Boltzmann equation for applications in chemistry and biophysics.Recent developments in boundary element methods,interface methods,adaptive methods,finite element methods,and other approaches for the Poisson-Boltzmann equation as well as related mesh generation techniques are reviewed.We also discussed the challenging problems and possible future work,in particular,for the aim of biophysical applications. | B.Z.Lu Y.C.Zhou M.J.Holst J.A.McCammon | 2008 | Communications in Computational Physics2008，3，5： | 0 |
| 16 | Pb-DOPING EFFECTS ON THE DIELECTRIC AND PYROELECTRIC PROPERTIES OF(Sr,Pb)TiO_(3)SYSTEM显示文摘Lead strontium titanate(Sr_(1-x)Pbx)TiO_(3)(0.20≤x≤0.45,step=0.05)ceramics were prepared by conventional mixed oxide method.The X-ray diffraction patterns indicate that the prepared samples have perovskite-type structure.With the increase of Pb content,there is a tendency from the cubic to tetragonal structure.The scanning electron microscopy micrographs reveal that the addition of Pb can affect microstructure.The dependent temperature dielectric permittivity and dielectric loss were investigated in the frequency range from 100 Hz to 1MHz.The maximum peak of the dielectric permittivity versus temperature curve was broadened and a frequency dispersion of the dielectric permittivity was observed for the(Sr_(0.8)Pb_(0.2))TiO_(3)ceramics.The results obtained at the frequency of 10 kHz reveal the Curie temperature linearly increased with the lead content.Thefitted curves of temperature versus inverse dielectric permittivity at 10 kHz for(Sr_(1-x)Pbx)TiO_(3)ceramics are consistent with Curie-Weiss law.The Pyroelectric properties were also investigated.The high pyroelectric coe±cients andfigure of merits indicate that the SPT ceramics are potential materials for pyroelectric sensors. | Y.P.JIANG X.G.TANG Y.C.ZHOU Q.X.LIU | 2012 | Journal of Advanced Dielectrics2012，2，1： | 0 |
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