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analytical model for predicting time-dependent lateral deformation of geosynthetics-reinforced soil walls with modular block facing

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 711-725页

作者： Luqiang Ding Chengzhi Xiao Feilong Cui School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China

To date,few models are available in the literature to consider the creep behavior of geosynthetics when predicting the lateral deformation(d)of geosynthetics-reinforced soil(GRS)retaining *** this study,a general hyperbolic creep model was first introduced to describe the long-term deformation of geosynthetics,which is a function of elapsed time and two empirical parameters a and *** conventional creep tests with three different tensile loads(Pr)were conducted on two uniaxial geogrids to determine their creep behavior,as well as the a-Pr and b-Pr *** test results show that increasing Pr accelerates the development of creep deformation for both ***,a and b respectively show exponential and negatively linear relationships with Pr,which were confirmed by abundant experimental data available in other *** on the above creep model and relationships,an accurate and reliable analytical model was then proposed for predicting the time-dependent d of GRS walls with modular block facing,which was further validated using a relevant numerical investigation from the previous *** evaluation and comparison of the proposed model with six available prediction models were *** a parametric study was carried out to evaluate the effects of wall height,vertical spacing of geogrids,unit weight and internal friction angle of backfills,and factor of safety against pullout on d at the end of construction and 5 years *** findings show that the creep effect not only promotes d but also raises the elevation of the maximum d along the wall ***,the limitations and application prospects of the proposed model were discussed and analyzed.

关键词： Geosynthetics Creep behavior Geosynthetics-reinforced soil(GRS)walls Lateral deformation analytical model

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analytical model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles

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Chinese Journal of Chemical Engineering 2013年第10期21卷 1114-1120页

作者： Alireza Rahbari Fatemeh Ebrahiminasab Mehdi Bidabadi Department of Mechanical Engineering Shahid Raj aee Teacher Training University (S RTTU) Tehran lran Deigartment of Mechanical Englneering. Iran University of Science and Technology Combustion Research LaboratoryNarmak Tehran Iran

This paper presents the combined influence of heat-loss and radiation on the pyrolysis of biomass particles by considering the structure of one-dimensional, laminar and steady state flame propagation in uniformly premixed wood particles. The assumed flame structure consists of a broad preheat-vaporization zone where the rate of gas-phase chemical reaction is small, a thin reaction zone composed of three regions: gas, tar and char combustion where convection and the vaporization rate of the fuel particles are small, and a broad convection zone. The analysis is performed in the asymptotic limit, where the value of the characteristic Zeldovich number is large and the equivalence ratio is larger than unity(i.e.u≥1). The principal attention is made on the determination of a non-linear burning velocity correlation. Consequently, the impacts of radiation, heat loss and particle size as the determining factors on the flame temperature and burning velocity of biomass particles are declared in this research.

关键词： analytical model heat loss radiation particle size pyrolysis tlame temperature burning velocity

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analytical model of tilted driver–pickup coils for eddy current nondestructive evaluation

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Chinese Physics B 2018年第3期27卷 125-131页

作者： Bing-Hua Cao Chao Li Meng-Bao Fan Bo Ye Gui-Yun Tian School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment China University of Mining and TechnologyXuzhou 221116China School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Faculty of Information Engineering and Automation Kunming University of Sciance and TechnologyKunming 650500China School of Electrical and Electronic Engineering Newcastle UniversityNewcastle upon Tyne NE17RUUK

A driver-pickup probe possesses better sensitivity and flexibility due to individual optimization of a *** is fre-quently observed in an eddy current(EC)array *** this work,a tilted non-coaxial driver-pickup probe above a multilayered conducting plate is analytically modeled with spatial transformation for eddy current nondestructive ***,the core of the formulation is to obtain the projection of magnetic vector potential(MVP)from the driver coil onto the vector along the tilted pickup coil,which is divided into two key *** first step is to make a projection of MVP along the pickup coil onto a horizontal plane,and the second one is to build the relationship between the pr,ojected MVP and the MVP along the driver ***,an analytical model for the case of a layered plate is established with the reflection and transmission theory of electromagnetic *** calculated values from the resulting model indicate good agreement with those from the finite element model(FEM)and experiments,which validates the developed analytical model.

关键词： nondestructive evaluation eddy currents tilted coils analytical model

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analytical model for straight hemming based on minimum energy method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 532-542页

作者： Qian WANG Xiang-huai DONG He-zong LI Hai-ming ZHANG National Engineering Research Center of Die & Mold CAD Shanghai Jiao Tong University Shanghai 200030 China

An analytical model for straight hemming was developed based on minimum energy method to study the effect of flanging die corner radius on hemming *** order to calculate plastic strain and strain energy more exactly,the neutral layer of specimen corner after hemming is assumed to be a half ellipse with its major semi-axis *** hardening rule is adopted to describe bending and reverse bending processes neglecting Bauschinger *** model takes into account the material property parameters in order to satisfy a wide application range of different *** profile,creepage/growing(roll-in/roll-out) and maximum equivalent strain are predicted,which are greatly influenced by the flanging die corner *** facilities were designed and hemming experiments were *** predicted results of the present analytical model were compared to experimental data as well as finite element(FE) simulation *** was confirmed that they are in good agreement,and the model can be used to evaluate whether the material used as an outer panel for hemming is appropriate and to optimize process parameters when the material used for hemming is changed.

关键词： analytical model Minimum energy method Defects Large deformation Hemming

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analytical model including the fringing-induced barrier lowering effect for a dual-material surrounding-gate MOSFET with a high-κ gate dielectric

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Chinese Physics B 2012年第4期21卷 605-611页

作者：李聪庄奕琪张丽包军林 School of Microelectronics Xidian UniversityXi'an 710071China

By solving Poisson＇s equation in both semiconductor and gate insulator regions in the cylindrical coordinates, an analytical model for a dual-material surrounding-gate （DMSG） metal-oxide semiconductor field-effect transistor （MOSFET） with a high-k gate dielectric has been developed. Using the derived model, the influences of fringing-induced barrier lowering （FIBL） on surface potential, subthreshold current, DIBL, and subthreshold swing are investigated. It is found that for the same equivalent oxide thickness, the gate insulator with high-k dielectric degrades the short-channel performance of the DMSG MOSFET. The accuracy of the analytical model is verified by the good agreement of its results with that obtained from the ISE three-dimensional numerical device simulator.

关键词： high-k gate dielectric fringing-induced barrier lowering analytical model

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analytical model of cutting force in axial ultrasonic vibration-assisted milling in-situ TiB_(2)/7050Al PRMMCs

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Chinese Journal of Aeronautics 2021年第4期34卷 160-173页

作者： Xiaofen LIU Wenhu WANG Ruisong JIANG Yifeng XIONG Kunyang LIN Junchen LI Chenwei SHAN Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

Ultrasonic vibration-assisted milling has been widely applied in machining the difficultto-cut materials owing to the remarkable improvements in reducing the cutting ***,analytical models to reveal the mechanism and predict the cutting force of ultrasonic vibrationassisted milling metal matrix composites are still needed to be *** this paper,an analytical model of cutting force was established for ultrasonic vibration-assisted milling in-situ TiB_(2)/7050 Al metal matrix *** modeling,change of motion of the cutting tool,contact of toolchip-workpiece and acceleration of the chip caused by ultrasonic vibration was considered based on equivalent oblique cutting ***,material properties,tool geometry,cutting parameters and vibration parameters were taken into ***,the developed analytical force model was validated with and without ultrasonic vibration milling experiments on in-situ TiB_(2)/7050 Al metal matrix *** predicted cutting forces show to be consistent well with the measured cutting ***,the relative error of instantaneous maximum forces between the predicted and measured data is from 0.4%to 15.1%.The analytical model is significant for cutting force prediction not only in ultrasonic-vibration assisted milling but also in conventional milling in-situ TiB_(2)/7050 Al metal matrix composites,which was proved with general applicability.

关键词： Al-MMCs analytical model Cutting force In-situ Milling TiB_(2)particles Ultrasonic vibration

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analytical model of 2D leakoff in waterflood-induced fractures

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1713-1733页

作者： Igor Reznikov Dimitry Chuprakov Ilmir Bekerov Schlumberger Moscow Research MoscowRussia

Waterflood-induced fractures,also known as self-induced fractures,spontaneously form at injection wells during *** fractures propagate long distances through rock,allowing injected fluids to travel far away from a well,both within and outside the flooding ***,the me-chanics of waterflood-induced fracture propagation is similar to that of hydraulic fractures,which are intentionally created for reservoir *** models developed for hydraulic fractures can also be applied to waterflood-induced ***,waterflood-induced fractures are typically pumped with much larger volumes of water or brine and grow much longer in *** a result,fluid leakoff from waterflood fractures into the formation is more extensive and two-dimensional(2D),a characteristic that is often ignored in a majority of modern fracturing simulators,making their appli-cation to waterflood fractures *** this work,we revisit the problem of leakoff for long-growing waterflood-induced fractures and develop a new analytical model for fluid leakoff that provides improved predictions of fracture geometry and can be easily implemented in fracturing *** incorporate the developed solution into the classical Perkins-Kern-Nordgren(PKN)model of fracture growth,which shows that the choice of the Carter or a 2D leakoff model greatly impacts fracture ge-ometry at large *** conducted parametric study shows while a toughness-dominated regime af-fects fracture evolution,most of fracture lifetime occurs in a viscosity-and-leakoff-dominated *** also develop an asymptotic solution for a leakoff profile in the limiting case of 2D leakoff domination(~~M and~~K).Finally,we study 3D fracture growth and out-of-zone injection with three layers and a complex structure of *** study shows that ignoring the 2D leakoff during simulation results in a significant overestimation of fracture geometry *** present work,thus,plays an impor

关键词： Waterflooding Leakoff analytical model Hydraulic fracturing Two-dimensional flow

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analytical model for Underwater Wireless Sensor Network Energy Consumption Reduction

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Computers, Materials & Continua 2022年第7期72卷 1611-1626页

作者： Huma Hasan Rizvi Sadiq Ali Khan Rabia Noor Enam Kashif Nisar Muhammad Reazul Haque Computer Science Department UBIT Karachi UniversityKarachi75270Pakistan Sir Syed University of Engineering and Technology Karachi75300Pakistan Faculty of Computing and Informatics University Malaysia SabahJalan UMS88400Kota KinabaluSabahMalaysia Faculty of Computing&Informatics Multimedia UniversityPersiaran Multimedia63100CyberjayaSelangorMalaysia

In an Underwater Wireless Sensor Network(UWSN),extreme energy loss is carried out by the early expiration of sensor nodes and causes a reduction in efficiency in the submerged acoustic sensor *** based on clustering strategies,instead of each node sending information by itself,utilize cluster heads to collect information inside the clusters for forwarding collective information to *** can effectively minimize the total energy loss during *** environment of UWSN is 3D architecture-based and follows a complex hierarchical clustering strategy involving its most effecting unique parameters such as propagation delay and limited transmission *** base clustering strategy works in rounds,where each round comprises three fundamental stages:cluster head selection,grouping or node association,and data aggregation followed by forwarding data to the *** UWSN,the energy consumed during the formation of clusters has been considered casually or completely evaded in the previous *** this paper,the cluster head setup period has been considered the main contributor to extra energy utilizer.A numerical channel model is proposed to compute extra *** is performed by using a UWSN broad *** results have shown that extra maximum energy consumption is approximately 12.9 percent of the system total energy consumed in information transmissions.

关键词： analytical model submerged acoustic sensor systems energy loss round base clustering UWSN extra energy

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analytical model of Elastic Modulus and Coefficient of Thermal Expansion for 2.5D C/SiC Composite

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 494-499页

作者：孔春元孙志刚 NIU Xuming SONG Yingdong College of Energy and Power Engineering and State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

To make better use of 2.5D C/SiC composites in industry, it is necessary to understand the mechanical properties. A finite element model＇of 2.5D composites is established, by considering the fiber undulation and the porosity in 2.5D C/SiC composites. The fiber direction of warp is defined by cosine function to simulate the undulation of warp, and based on uniform strain assumption, analytical model of the elastic modulus and coefficient of thermal expansion （CTE） for 2.5D C/SiC composites were established by using dual- scale model. The result is found to correlate reasonably well with the predicted results and experimental results. The parametric study also demonstrates the effects of the fiber volume fraction, distance of warp yarn, and porosity in micro-scale on the mechanical properties and the coefficients of thermal expansion.

关键词： 2.5D C/SiC composites finite element model analytical model elastic modulus coefficient of thermal expansion

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analytical model OF CERAMIC/METAL ARMOR IMPACTED BY DEFORMABLE PROJECTILE

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Applied Mathematics and Mechanics(English Edition) 2006年第3期27卷 287-294页

作者：张晓晴杨桂通黄小清 College of Traffic and Communications South China University of Technology Guangzhou 510640P. R. China Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024P. R. China

A new analytical model was established to describe the complex behavior of ceramic/metal armor under impact of deformable projectile by assuming some hypotheses. Three aspects were taken into account： the mushrooming deformation of the projectile, the fragment of ceramic tile and the formation and change of ceramic conoid and the deformation of the metal backup plate. Solving the set of equations, all the variables were obtained for the different impact velocities： the extent and particle velocity in rigid zone; the extent, cross-section area and particle velocity in plastic zone; the velocity and depth of penetration of projectile to the target; the reduction in volume and compressive strength of the fractured ceramic conoid; the displacement and movement velocity of the effective zone of backup plate. Agreement observed among analytical result, numerical simulation and experimental result confirms the validity of the model, suggesting the model developed can be a useful tool for ceramic/metal armor design.

关键词： ceramic/metal armor deformable projectile analytical model

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