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| 1 | A new fatigue life prediction model considering the creep-fatigue interaction effect based on the Walker total strain equation显示文摘The performance of high-temperature components of aero-engines under the CreepFatigue Interaction(CFI)behavior gets more attention recently.In this research,the creepfatigue tests of two superalloys of Powder Metallurgy(PM)FGH96 and direct aging GH4169 were performed at 650°C with different types of dwell,and the fracture morphology of FGH96 specimens was observed by Scanning Electron Microscopy(SEM)to analyze the creep-fatigue fracture feature and crack initiation.Additionally,according to phenomenology,the effect of dwell was introduced to develop a new uniaxial fatigue life prediction model based on the total strain equation,which has capability to take dwell time and load ratio into account together.The equations were utilized to model the test data of PM FGH96 and GH4169,together with data of another superalloy PM FGH95 conducted previously.A prominent prediction ability of the model in creep-fatigue life prediction of different superalloys has been manifested.Most data points of test data and estimated data are located within two times scatter band,which is ideal in engineering. | Siyuan CHEN Dasheng WEI Jialiang WANG Yanrong WANG Xianghua JIANG | 2020 | Chinese Journal of Aeronautics2020，33，9： | 2 |
| 2 | Effect of Mg on Microstructure and Growth Kinetics of Zn-22.3Al-1.1Si Coating显示文摘The effects of Mg on the microstructure and growth kinetics of the hot-dip Zn-22.3 Al-1.1 Si-x Mg(x = 0, 0.2, 0.4, and 0.6) coatings were investigated in detail. Scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction studies revealed the presence of η-Zn, α-Al, Zn/Al eutectoid,(Si), Al/Si eutectic, and Zn/Al/Mg_2 Zn11 ternary eutectic on the top surface of these Mg-containing coatings. Especially, a small amount of MgZn2 phase appears in top surface of Zn-22.3 Al-1.1 Si-0.6 Mg coating. Five phases are found in the alloy layers, i e, Fe_2 Al_5, FeAl_3, τ_(5C), τ_(5H), and τ_1. The addition of 0.2% Mg can delay the emergence of FeAl_3 phase. When the Mg content is more than 0.2%, the outer layers of coating change from τ_(5C) to τ_(5H) phase. The growth of the inhibition layer is diffusion controlled for various Mg content baths. Mg improves the corrosion resistance of the Mg-containing coatings, and the Zn-22.3 Al-1.1 Si-0.6 Mg coating possesses the highest protective properties. | 涂浩 WEI Dasheng ZHOU Shengjie LIU Ya WU Changjun WANG Jianhua 苏旭平 | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，2： | 2 |
| 3 | On the diophantine equation x^2-Dy^2=n显示文摘We propose a method to determine the solvability of the diophantine equation x2-Dy2=n for the following two cases:(1) D = pq,where p,q ≡ 1 mod 4 are distinct primes with(q/p)=1 and(p/q)4(q/p)4=-1.(2) D=2p1p2 ··· pm,where pi ≡ 1 mod 8,1≤i≤m are distinct primes and D=r2+s2 with r,s ≡±3 mod 8. | WEI DaSheng | 2013 | Science China Mathematics2013，56，2： | 2 |
| 4 | Lock-in phenomenon of tip clearance flow and its influence on aerodynamic damping under specified vibration on an axial transonic compressor rotor显示文摘In this study,the lock-in phenomenon of Tip Clearance Flow(TCF)instabilities and their relationship to blade vibration are investigated numerically on an axial transonic rotor with a large tip clearance.The capabilities of simulating instability flow and lock-in phenomenon are verified on a transonic rotor and a NACA0012 airfoil by comparing with the test data,respectively.The lock-in phenomenon is first numerically confirmed that may occur to TCF instabilities when its frequency is close to the blade vibration frequency.The lock-in region becomes wider with the vibration amplitude increasing,and it is also affected by modal shapes.For the rotor at the simulation conditions in this study,the bending mode results in a wider lock-in region than the torsional mode.In the lock-in region,the phase difference between the Tip Clearance Vortex(TCV)and the blade vibration changes with the flow condition and the frequency ratio of the blade vibration and the TCV instabilities.The frequency of the TCV instabilities reduces with the mass flow decreasing.Therefore,reducing mass flow and increasing frequency ratio have similar effects on the TCV phase,which causes a significant variation on the unsteady pressure amplitude in the blade tip area.Thus,the aerodynamic damping changes significantly with the TCV phase.The aerodynamic damping displays a nonlinear relationship with the vibration amplitude,and it changes from negative to positive with the vibration amplitude increasing at the same frequency ratio.The negative damping is mainly provided by the tip area of the blade.For unlocked conditions,the period of the TCF instabilities fluctuates over time,and it cannot be directly separated by their frequency features.Inter Blade Phase Angle(IBPA)also has an important influence on the feature of the TCV instabilities.The occurrence of frequency lock-in also requires“appropriate”IBPA.For the examined working conditions,the frequency lock-in occurs under 0 ND(Nodal Diameter),but not under 8 ND.However,no matter 0 ND or 8 ND,the phase of TCV always locks onto the IBPA at the examined conditions. | Le HAN Dasheng WEI Yanrong WANG Mingchang FANG | 2022 | Chinese Journal of Aeronautics2022，35，3： | 2 |
| 5 | Investigation and modeling of low cycle fatigue behaviors of two Ni-based superalloys under dwell conditions显示文摘 | WEI Dasheng YANG Xiaoguang | 2009 | International Journal of Pressure Vessels and Piping2009，86，9： | 1 |
| 6 | On the sum of two integral squares in the imaginary quadratic field Q(-2p)^(1/2)显示文摘We determine the sum of two integral squares over imaginary quadratic fields Q(√-2p),where p≡1 mod 8 is a prime satisfying 2p=r2+s2with r,s≡±3 mod 8. | WEI DaSheng | 2014 | Science China Mathematics2014，57，1： | 1 |
| 7 | The change of serum leptin and its relationship with platelet membrane glycoprotein Ib in patients with coronary heart disease显示文摘The aim of this paper was to investigate the change of serum leptin and its relationship with platelet mem-brane glycoprotein Ib(GP Ib)in patients with coronary heart disease(CHD).The enrolled included 50 patients with CHD(CHD group)and 30 patients without CHD(control group)who were diagnosed by coronary angiography.The positive percentage and the average fluorescence intensity of platelet membrane GP Ib were detected by full-blood flow cytometry.Serum leptin was detected by enzyme linked immunosorbent assay.The positive percentage and the average fluorescence intensity of platelet membrane GP Ib in the CHD group were significantly lower than those in the control group(P<0.05).After correcting the differences of systolic blood pressure,body mass index(BMI),low-density lipoprotein cholesterol(LDL-C),high-density lipoprotein cholesterol(HDL-C),fasting glucose,PPBS,fasting insulin and quantita-tive insulin sensitive index,serum leptin level in the CHD group was significantly higher than that in the control group(P<0.05).Single factor correlative analysis revealed that serum leptin in CHD patients was negatively correlated with the average fluorescence intensity of platelet membrane GP Ib(P<0.05).Multifactorial stepwise regression analysis showed that serum leptin in CHD patients was independently negatively correlated with the average fluorescence intensity of platelet membrane GP Ib(P<0.05).Logistic analysis demonstrated that serum leptin was independently correlated with the risk of CHD(P<0.05).Hyperleptinemia was veri-fied in CHD patients.The increase of serum leptin could affect blood platelet activation.Hyperleptinemia may play an important role in the pathogenesis of CHD. | XIA Dasheng SONG Yanqiu LI Chao ZHANG Feng WEI Minxin | 2007 | Frontiers of Medicine2007，1，4： | 0 |
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