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Rock Mechanics Bulletin 2024年第3期3卷 69-80页

作者： Erdi Abi Qifu Zeng Lin Fu Mingjing Jiang Jie Zhang Fayou Wu Mingwei Liu Yafeng Han National Engineering Research Center for Inland Way Regulation Key Laboratory of Geological Hazards Mitigation of Mountainous Highway and WaterwayChongqing Jiaotong UniversityChongqing400074China school of civilengineering Suzhou University of Science and TechnologySuzhouJiangsu215009China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai200092China school of Engineering Tibet UniversityLhasa850013China

Utilizing a bespoke CO_(2) phase transition pulse pressure experimental system,we conducted pulse pressure characterization tests across various activator masses,CO_(2) filling pressures,and energy discharge plate *** approach enabled us to ascertain the pulse pressure's response characteristics and variation patterns under diverse *** formula for calculating the peak supercritical CO_(2)pulse pressure was deduced by modeling the ultimate load calculation of the clamped circular plate,and then the time-course expression of the supercritical CO_(2)phase transition pulse pressure and energy was carried out by introducing the time factor and taking into account the parameters of the activator mass and the thickness of the energy discharging *** findings reveal a four-stage pressure evolution in the cracking tube during initiation:a gradual increase,a rapid spike,swift attenuation,and eventual negative pressure *** activator mass and discharge plate thickness critically influence the peak pressure's timing and ***,increased activator mass hastens peak pressure onset,while a thicker discharge plate amplifies *** errors between calculated and experimental values for peak supercritical CO_(2) phase transition pressure fall within5%–5%.Furthermore,the pressure peak and arrival time model demonstrates less than 10%error compared to experimental data,affirming its strong *** insights offer theoretical guidance for controlling phase transition pressure and optimizing energy in supercritical CO_(2) systems.

关键词： Supercritical CO_(2)phase transition Pressure-energy characterization test Pulsed peak pressure Pulsed pressure-energy time-course computational modeling

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Preparation and anti atomic oxygen erosion properties of OPPOSS/PI composites

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 994-1000页

作者： Wei-ping Li Hui-cong Liu Li-li Feng school of Materials Science and Engineering Beihang University Key Laboratory of Urban Stormwater System and Water Environment (Ministry of Education) Beijing University of CivilEngineering and Architecture

Atomic oxygen （AO） found in low earth orbit can cause serious erosion to polyimide （PI） materials, which greatly limits their lifetime. 8-phenyl silsesquioxane （OPPOSS） was synthesized, and OPPOSS/PI composites were pre- pared by physical blending, followed by thermal imidization to enhance the AO erosion resistance of PI materials. The morphology, composition, and structure of the composites were analyzed before and after AO exposure in a ground sim- ulated facility of atomic oxygen. After 16 h AO exposure, the OPPOSS/PI composite with 5wt% OPPOSS addition shows an erosion rate of about 1.4×10-24 cm3/atom with only 48% mass loss of that of PI without OPPOSS addition. The mixture of OPPOSS nano molecules is assembled into a kind of regular square structure and distributed evenly in OPPOSS/PI composites. Some SiO2 particles are formed in the composites during AO exposure, which can act as ＂inert points＂ to reduce the AO erosion rate of OPPOSS/PI composites.

关键词： composite materials polyimides silsesquioxanes atomic oxygen erosion

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The anelastic origin of mechanical cycling induced rejuvenation in the metallic glass

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Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 93-100页

作者： Langting Zhang Yunjiang Wang Yong Yang Jichao Qiao school of Mechanics CivilEngineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 70072China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China school of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Department of Mechanical Engineering College of EngineeringCity University of Hong KongHong Kong 999077China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongHong Kong 999077China Innovation Center NPU-ChongqingChongqing 401135China

Mechanical cycling is one of the effective methods to rejuvenate metallic glasses(MGs)and improve their mechanical *** anelastic origin of the rejuvenation by mechanical cycling in a La_(30)Ce_(30)Ni_(10)Al_(20)Co_(10) MG was investigated via differential scanning calorimetry(DSC)and dynamic mechanical analysis(DMA).We demonstrate that mechanical cycling promotes the activation of flow defects with short relaxation times,leading to anelastic strains and therefore considerable energy storage,which manifests itself as larger relaxation enthalpy on the DSC curves of ***,the MGs release the excess relaxation enthalpy caused by anelastic strain with time,thus suppressing atomic mobility and elevating β relaxation activation *** strategy of mechanical cycling at small strains,as demonstrated in the current work,can expand the energy states of MGs over a wide range of relaxation enthalpies.

关键词： metallic glass mechanical cycling rejuvenation anelastic strain structural heterogeneity

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Compressible effect on the cavitating flow:A numeric study

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Journal of Hydrodynamics 2017年第6期29卷 1089-1092页

作者：张伟柏晓东马峥陈刚 Yong Wang Science and Technology on Water Jet Propulsion Laboratory Marine Design and Research Institute of ChinaShanghai 200011China Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of CivilEngineeringHarbin Institute of TechnologyHarbin 150090China China Ship Scientific Research Center Wuxi 214082China Max Planck Institute for Dynamics and Self-Organization Am Faflberg 17Gottingen 3 7077Germany

To understand the effect of the compressibility on the cavitating flow, a compressible, multiphase, single component Reynolds averaged Navier-Stokes（RANS） solver is used to study the cavitating flow on a wedge in the present work. A barotropic equation of status is used. A non-linear model for compressibility in the mixture is adopted to capture the effect of the compressibility within the complex cavitation bubbly mixtures. An unsteady cavitation phenomenon is found in the numerical simulation. The numerical results of local compressibility and Mach number in the bubbly mixture are given. The mechanism responsible for the unsteady shedding of the bubbly mixture is discussed based on the numerical results.

关键词： Cavitation compressibility barotropic flow

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