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北京粘接学会第二十三届学术年会暨粘接剂、密封剂技术发展研讨会

作者： P.Jousset M.Rachik Sika Technology AG Tffenwies 168048 Zrich Switzerland Université de Technologie de Compiegne Lab. LRM60205 CompiegneFrance

This paper focuses on the quasi-static three-dimensional Finite Element(FE) analysis of structural bonded joints using an advanced material constitutive *** model predicts multi-axial pressure-dependent plasticity as well as damage and failure in confined adhesive *** formulation of plasticity,which considers the influence of hydrostatic pressure,is recalled and the implementation of damage and fracture,using Cohesive Zone(CZ) modelling is *** identification of material constitutive parameters is addressed using butt-bonded hollow cylinders loaded under different load paths,Double Cantilever Beams(DCB) and End Notched Flexure specimens(ENF).The set of material parameters identified is crossed-checked using modified Arcan specimens and finally validated by the FE analysis of an industrial *** methodology developed combines results accuracy and computational efficiency and is well adapted to the numerical simulations of large adhesively bonded industrial structures.

关键词： Tougnenea aanesives/epoxiaes finite Eiement stress Analysis Fracture mecnanics Elasto-plasticity Adhesive testing

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Fluid-structure interaction simulation of pathological mitral valve dynamics in a coupled mitral valve-left ventricle model

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Intelligent Medicine 2023年第2期3卷 104-114页

作者： Li Cai Tong Zhao Yongheng Wang Xiaoyu Luo Hao Gao NPU-UoG International Cooperative lab for Computation and Application in Cardiology School of Mathematics and StatisticsNorthwestern Polytechnical UniversityXi’anShaanxi 710129China Xi’an Key laboratory of Scientific Computation and Applied Statistics Xi’anShaanxi 710129China School of Mathematics and Statistics University of GlasgowGlasgowG128QQUnited Kingdom

Background Understanding the interaction between the mitral valve(MV)and the left ventricle(LV)is very important in assessing cardiac pump function,especially when the MV is *** dysfunction is a major medical problem owing to the essential role of the MV in cardiac pump *** modelling can provide new approaches to gain insight into the functions of the MV and *** In this study,a previously developed LV-MV model was used to study cardiac dynamics of MV leaflets under normal and pathological conditions,including hypertrophic cardiomyopathy(HOCM)and calcification of the *** coupled LV-MV model was implemented using a hybrid immersed boundary/finite element method to enable assessment of MV haemodynamic *** parameters of the HOCM and calcified valves were inversely determined from published experimental *** LV compensation mechanism was further studied in the case of the calcified *** Our results showed that MV dynamics and LV pump function could be greatly affected by MV *** example,the HOCM case showed bulged MV leaflets at the systole owing to low stiffness,and the calcified MV was associated with impaired diastolic filling and much-reduced stroke *** further demonstrated that either increasing the LV filling pressure or increasing myocardial contractility could enable a calcified valve to achieve near-normal pump *** The modelling approach developed in this study may deepen our understanding of the interactions between the MV and the LV and help in risk stratification of heart valve disease and in silico treatment planning by exploring intrinsic compensation mechanisms.

关键词： Mitral valve Left ventricle Valve disease Hybrid immersed boundary/finite element method Calcification Hypertrophic cardiomyopathy

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Waste biomass from production process co-firing with coal in a steam boiler to reduce fossil fuel consumption:A case study

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Journal of Energy Chemistry 2013年第3期22卷 413-419页

作者： Hongyan Gu Kai Zhang Yaodong Wang Ye Huang Neil Hewitt Anthony P Roskilly Electrical Engineering College Guizhou University National Engineering lab for Biomass Power Generation Equipment School of Renewable EnergyNorth China Electric Power University Sir Joseph Swan Centre for Energy Research Newcastle UniversityNewcastle Upon TyneNEl 7RUUK School of Built Environment University of UlsterNewtownabbey BT37 OQBUK

Waste biomass is always generated during the production process in industries. The ordinary way to get rid of the waste biomass is to send them to landfill or burn it in the open field. The waste may potentially be used for co-firing with coal to save fossil fuel consumption and also reduce net carbon emissions. In this case study, the bio-waste from a Nicotiana Tahacum （NT） pre-treatment plant is used as the biomass to co-fire with coal. The samples of NT wastes were analysed. It was found that the wastes were of the relatively high energy content which were suitable for co-firing with coal. To investigate the potential and benefits for adding NT wastes to a Fluidised Bed Combustion （FBC） boiler in the plant, detailed modelling and simulation are carried out using the European Coal Liquefaction Process simulation and Evaluation （ECLIPSE） process simulation package. The feedstock blending ratios of NT waste to coal studied in this work are varied from 0% to 30%. The results show that the addition of NT wastes may decrease the emissions of CO2 and SOx without reducing the boiler performance.

关键词： coal waste biomass co-firing nicotiana tabacum waste emissions reduction

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A Review on Discrete Element Method simulation in Laser Powder Bed Fusion Additive Manufacturing

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第1期1卷 70-82页

作者： Hui Chen Yajing Sun Weihao Yuan Shengyong Pang Wentao Yan Yusheng Shi State Key lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore Department of Mechanical Manufacturing and Biomedical EngineeringTrinity College Dublinthe University of DublinDublin 2Ireland

Laser powder bed fusion(LPBF)is a popular metal additive manufacturing ***,the materials employed for LPBF are discrete and particulate metal ***,the discontinuous behaviors exhibited by the powder materials cannot be simulated solely using conventional continuum-based computational approaches,such as finite-element or finite-difference *** discrete element method(DEM)is a proven numerical method to model discrete matter,such as powder particles,by tracking the motion and temperature of individual ***,DEM simulation has gained popularity in LPBF ***,it has not been widely *** study reviews the existing applications of DEM in LPBF processing,such as powder spreading and fusion.A review of the existing literature indicates that DEM is a promising approach in the study of the kinetic and thermal fluid behaviors of powder particles in LPBF additive manufacturing.

关键词： Laser powder bed fusion Discrete element method Additive manufacturing modelling Numerical simulation

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Physio-chemical modeling of the NO_(x)-O_(3) photochemical cycle and the air pollutants’ reactive dispersion around an isolated building

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Building simulation 2023年第9期16卷 1735-1758页

作者： Yunfei Fu Xisheng Lin Xing Zheng Liangzhu Wang Chun-Ho Liu Xuelin Zhang Cruz Y.Li K.T.Tse Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Future Cities lab Global Singapore-ETH CentreSingapore 138602 Department of Building Civil and Environmental Engineering at Concordia UniversityMontrealQuebecCanada Department of Mechanical Engineering The University of Hong KongPok-fu-lam RoadHong KongChina Department of Civil Engineering Chongqing UniversityChongqingChina School of Atmospheric Sciences Sun Yat-sen UniversityZhuhaiChina

A numerical physio-chemical model of the NO_(x)-O_(3) photochemical cycle in the near-wake region of an isolated residential/office building has been presented in this *** investigation delves into the dispersion of reactive air pollutants through the lens of fluid phenomenology and its impact on chemical reactivity,formation,transport,deposition,and *** fluid dynamics(CFD)simulations were conducted for the ground-point-source(GES)and roof-pointsource(RES)*** show that the Damköhler number(Da),which quantifies pollutants’physio-chemical timescales,displays a strong inverse proportionality with the magnitude and spread of NO–increasing Da reduces human exposure to the toxic NO and NO_(2) *** different wind directions were considered,the dispersion range of NO exhibited varying shrinking directions as Da ***,as Da increases,the concentration ratio KNO_(2)/KNO_(x),which quantifies the production of NO_(2) resulting from NO depletion,forms sharp high-low gradients near emission *** GES,the dispersion pattern is governed by the fluid’s phenomenological *** RES,the intoxicated area emanates from the building’s leading-edge,with the lack of shielding inhibiting pollutant interactions in the near-wake,resulting in scant physio-chemical *** NO_(2)/NO_(x) distribution follows a self-similar,stratified pattern,exhibiting consistent layering gradients and attributing to the natural deposition of the already-reacted pollutants rather than in-situ *** the end,building design guidelines have been proposed to reduce pedestrian and resident exposure to NO_(x)-O_(3).

关键词： reactive pollutant dispersion NO_(x)-O_(3)cycle air pollution isolated building physio-chemical modelling

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