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RISS 인기검색어
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- 저자 : Haipeng Song (검색결과 4 건)
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Experimental and numerical research on cavitating flows around axisymmetric bodies
Wei Haipeng,Fu Song,Wu Qin,Huang Biao,Wang Guoyu 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
We investigated the cavitating flows around different axisymmetric bodies based on experiments and numerical simulation. In the numericalsimulation, the multiphase Reynolds averaged Navier Stokes equations (RANS) were solved via the commercial computationalfluid dynamics code CFX. The modified k-w SST turbulence model was used along with the transport equation-based cavitation model. In the experiments, a high-speed video technique was used to observe the unsteady cavitating flow patterns, and the dynamic force measurementsystem was used to measure the hydrodynamics of the axisymmetric bodies under different cavitation conditions. Results areshown for the hemisphere bodies, conical bodies and blunt bodies. Reasonable agreements were obtained between the computational andexperimental results. The results show that for the hemispherical body, the cavity consists of quasi-steady transparent region and unsteadyfoggy water-vapor mixture region, which contains small-scale vortices and is dominated by bubble clusters, causing irregulardisturbances at the cavity interfaces. The curvature at the front of the conical body is larger, resulting in that the flow separates at theshoulder of the axisymmetric body. The cavity stretches downstream and reaches to a fixed cavity length and shape. For blunt bodies, theincipient cavitation number is larger than that for the hemispherical body. A large cloud cavity is formed at the shoulder of the blunt bodyin the cores of vortices in high shear separation regions and the re-entrant jet does not significantly interact with the cavity interface whenit moves upstream. As to the dynamic characteristics of unsteady cavitating flows around the axisymmetric bodies, the pulsation frequencyfor the hemispherical body is larger than that for the blunt body. For the hemispherical body, the pulsation is mainly caused bythe high-frequency, small-scale shedding at the rear end of the cavity, while for the blunt body, the main factor for the pulsation frequencyis the periodically shedding of large-scale vortex cavities.
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Emission properties of sequentially deposited ultrathin CH3NH3PbI3/MoS2 heterostructures
Shao Ziyi,Xiao Junting,Guo Xiao,You Siwen,Zhang Yangyang,Li Mingjun,Song Fei,Zhou Conghua,Xie Haipeng,Gao Yongli,Sun Jiatao,Huang Han 한국물리학회 2022 Current Applied Physics Vol.36 No.-
Hybrid organic-inorganic perovskite materials have obtained considerable attention due to their exotic optoelectronic properties and extraordinarily high performance in photovoltaic devices. Herein, we successively converted the ultrathin PbI2/MoS2 into the CH3NH3PbI3/MoS2 heterostructures via CH3NH3I vapor processing. Atomic force microscopy (AFM)、Scanning electron microscopy (SEM) and X-ray photoemission spectroscopy (XPS) measurements prove the high-quality of the converted CH3NH3PbI3/MoS2. Both MoS2 and CH3NH3PbI3 related photoluminescence (PL) intensity quenching in CH3NH3PbI3/MoS2 implies a Type-II energy level alignment at the interface. Temperature-dependent PL measurements show that the emission peak position shifting trend of CH3NH3PbI3 is opposite to that of MoS2 (traditional semiconductors) due to the thermal expansion and electron-phonon coupling effects. The CH3NH3PbI3/TMDC heterostructures are useful in fabricating innovative devices for wider optoelectronic applications.
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Hao Zhang,Chang Xu,Tao Gao,Xunpeng Li,Haipeng Song 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
This study proposes an inverse methodology for determining the strain hardening behaviors at large deformation of titanium alloys using uniaxial tensile and notched tests with finite element analysis. Various hardening laws and data fitting range are considered to characterize the stress-strain relationships of commercially pure titanium (CP-Ti) and Ti6Al4V alloys which can increase the flexibility of identifying the proper models. A new hybrid HHSL hardening model is presented for CP-Ti and its parameters are obtained by iteratively minimizing the difference between the finite element simulation and experimental data. The hardening behavior of Ti6Al4V alloy is predicted by the weighted HSV model. The results show that mechanical response and loading curves from the identified numerical models are consistent with the experimental results of titanium alloys, demonstrating the validity and effectiveness of the proposed inverse approach in practical use.
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Study on the Tensile and Shear Behaviors of Selective Laser Melting Manufactured Ti6Al4V
Hao Zhang,Tao Gao,Chang Xu,Lingyu Zhao,Haipeng Song,Ganyun Huang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
The deformation and failure of Ti6Al4V produced by Selective Laser Melting (SLM) under tensile and shear stress states have been experimentally investigated with different types of the samples. The digital image correlation (DIC) method was applied to observe the deformation, crack initiation and propagation behavior. The effects of building direction on the mechanical behavior were studied. The experimental results show that the yield strength and tensile strength of SLM manufactured Ti6Al4V along the build direction is slightly lower than the horizontal one, but the vertical samples have a higher ductility than horizontal samples. Fractographic analyses were conducted to investigate the damage mechanism and fracture mode of Ti6Al4V under different loading conditions. The defects and stress states have a significant influence on damage and failure behaviors of addictively manufactured Ti6Al4V alloy. The tensile stress tends to open up the defects in the vertically built specimen while the defects tend to be closed in the horizontally built specimen due to the building orientation. The nucleation, growth and coalescence of micro voids are the main damage mechanism of SLM fabricated Ti6Al4V alloy under tensile loading condition, and the void shearing mechanism dominates the failure of shear samples.
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