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| 1 | ON THE BURN RESISTANCE OF Ti-35V-15Cr-0.05C TITANIUM ALLOY显示文摘The Ti-35V-15Cr-0.05C (wt% is a new nonburning titanium alloy. The test for alloy combustibility was carried out by using CO2 laser. A 430 watt and 6mm diameter laser spot impinges directly on the sample within normal atmospheric pressure and temperature. The results show that the ignition time of the nonburning titanium alloy is the longest in the eight examined titanium alloys, and is 3.5 times that of TC4 alloy. The ignition tempeerature of the nonburning alloy is 2991° C, and is higher than that of TC4 alloy by 1976°C. On the condition of high tempeerature and rich oxygen,the surface of alloy forms a melting layer which plays roles of oxygen insulation, heat insulation and burning products insulation. This is the mechanism of combustion resistance. | G.P.Li D.Li Y.Y.Liu Q.J.Wang S.X.Guan Q.C.Li | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，3： | 2 |
| 2 | Nd-RICH PHASE PARTICLES IN AS-FORGED Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd ALLOY显示文摘TEM examination proves that the second phase particle within the as-forged Ti-55alloy consists of either bright or dark 'matrix' (nano-Nd3Sn) and some small dark blocks (SnO) dispersed in the 'matrix'. The HREM observation shows that the nanoNd3Sn phase is roughly spherical and about 3-15nm in diameter, and the grain boundaries with atout 1nm width are 'gas-like' structure. | G.P.Li D.Li Y.Y.Liu S.X. Guan and Q.J.Wang (Department of Titanium Alloys, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, China) | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，4： | 2 |
| 3 | 查看详情显示文摘 | S.H.Xie Y.Y.Liu J.Y.Li | | 0，，04： | 1 |
| 4 | 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 |
| 5 | 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 |
| 6 | 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 |
| 7 | Frequency Veering of Rotating Metal Porous Twisted Plate with Cantilever Boundary Using Shell Theory显示文摘The frequency veering of a metal porous rotating cantilever twisted plate with twist angle and stagger angle is investigated.Metal porous materials may have the characteristics of gradient or uniform distribution along the thickness direction.Based on the classical shell theory,considering the influence of centrifugal force produced by high-speed rotation,the free vibration equations of a rotating cantilever twisted plate are derived.Through the polynomial function and Rayleigh-Ritz method,the natural frequencies and mode shapes of the metal porous cantilever twisted plate in both static and rotating states are derived.The accuracy of the present theory and calculation results is confirmed by a comparison between them and the results available from the literature and those obtained from Abaqus.The influences of the thickness ratio,porosity,twist angle,stagger angle and rotational velocity on the frequency veering and mode shape shift of the rotating cantilever twisted plate with porous material under three different distributions are analyzed.It should be mentioned that the frequency veering accompanied by mode shape shift occurs in both static and dynamic states. | Y.Y.Liu Y.X.Hao W.Zhang L.T.Liu S.W.Yang Y.T.Cao | 2022 | Acta Mechanica Solida Sinica2022，35，2： | 0 |
| 8 | Natural vibration of cantilever porous twisted plate with variable thickness in different directions显示文摘In this paper,the blade is assumed to be a rotating variable thickness cantilever twisted plate structure,and the natural vibrations of variable thickness cantilever twisted plate made of metal porous material are studied.It is assumed that the thickness of the plate changes along spanwise direction and chordwise direction,respectively,and it changes in both directions.The classical thin shell theory,the first and second fundamental forms of surface and von Karman geometric relationship are employed to derive the total potential energy and kinetic energy of the cantilever twisted plate,in which the centrifugal force potential due to high rotational speed is included.Then,according to the Rayleigh-Ritz procedure and applying the polynomial functions which satisfy the cantilever boundary conditions,the dynamic system expressed by equations of motion is reduced to an eigenvalue problem.By numerical simulation,the frequency curves and the mode shapes of the twisted plate can be obtained to reveal the internal connection between natural vibration and the parameters.A series of comparison studies are performed to verify the accuracy of the present formulation and calculations,in which compared data come from experimental,finite element method and theoretical calculation,respectively.The influence of pre-twist angle,three different forms of thickness taper ratio and rotational speed on natural vibration,mode exchange and frequency veering phenomenon of the system is discussed in detail.In addition,the approach proposed here can efficiently extract analytical expressions of mode functions for rotating variable thickness cantilever twisted plate structures. | Y.X.Hao Y.Y.Liu W.Zhang L.T.Liu K.C.Sun S.W.Yang | 2023 | Defence Technology(防务技术)2023，27，9： | 0 |
| 9 | Construction of Non-Equilibrium Gas Distribution Functions through Expansions in Peculiar Velocity Space显示文摘Gas distribution function plays a crucial role in the description of gas flows at the mesoscopic scale.In the presence of non-equilibrium flow,the distribution function loses its rotational symmetricity,making the mathematical derivation difficult.From both the Chapman-Enskog expansion and the Hermite polynomial expansion(Grad’s method),we observe that the non-equilibrium effect is closely related to the peculiar velocity space(C).Based on this recognition,we propose a new methodology to construct the non-equilibrium distribution function from the perspective of polynomial expansion in the peculiar velocity space of molecules.The coefficients involved in the non-equilibrium distribution function can be exactly determined by the compatibility conditions and the moment relationships.This new framework allows constructing non-equilibrium distribution functions at any order of truncation,and the ones at the third and the fourth order have been presented in this paper for illustration purposes.Numerical validations demonstrate that the new method is more accurate than the Grad’s method at the same truncation error for describing non-equilibrium effects.Two-dimensional benchmark tests are performed to shed light on the applicability of the new method to practical engineering problems. | Z.Y.Yuan Z.Chen C.Shu Y.Y.Liu Z.L.Zhang | 2023 | Advances in Applied Mathematics and Mechanics2023，15，6： | 0 |
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