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Effect of Pressure on the Fracture of Compacted Argillaceous Particles

Engineering（科研） 2012年第1期4卷 18-23页

作者： mohamed bouaziz Said Abid Hatem Ksibi 不详

The compaction of granulated powder is a common forming process used in ceramic and pharmaceutical industries. Argillaceous particles are used as a model system to investigate granule failure during cold compaction. In this work both experimental and numerical investigations have been focused on the fracture in powder compacts. This includes studies of crack propagation and determination of operating conditions to avoid the green body fracture. In fact, axial compaction tests have been performed to determine material parameters for hardening. The numerical modelling is implemented using a finite element method based on the Van Mises criterion. Simulation examples are presented to dem- onstrate the ability of the model to compute the distribution of the relative stresses in porous media.

关键词： Cold Compaction Powder Technology Fracture Scraped Surface Cracking Cone Numerical Simulation

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Effect of Insecticides on <i>Trichogramma</i>Parasitoids Used in Biological Control against <i>Prays oleae</i>Insect Pest

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Advances in Chemical Engineering and Science 2015年第3期5卷 362-372页

作者： Imen Blibech Mohieddine Ksantini Taieb Jardak mohamed bouaziz Laboratory of Genetic Resources Improvement and Protection of Olive Tree Olive Tree Institute Sfax Tunisia Electrochemistry and Environment Laboratory National School of Engineers of Sfax University of Sfax Sfax Tunisia

This study investigated the direct effect of the insecticides deltamethrin and spinosad on three egg parasitoids species: Trichogramma oleae, T. cacoeciae and T. bourarachae. The parasitoid pupae were exposed to pesticide residues on fresh olive tree leaves at recommended concentrations (RC) at different time intervals: 3, 10, 17, 24 and 31 days after pesticide applications. Parasitism viability (% emergence from parasitized eggs) and adult emergence time (developmental time from pupa to adult emergence) were evaluated. Regarding to the International Organization of Biological Control (IOBC) guidelines, results of toxicity effects of insecticides show that: Deltamethrin was moderately harmful to all Trichogramma species at RC (Decis®100 milliliters·ha−1), however, spinosad was harmless to moderately harmful at RC (Tracer®20 milliliters·ha−1). Trichogramma species revealed differences with regard to adult emergence time and exhibited significant changes in parasitism viability with increasing time after pesticide treatment. While deltamethrin residues affected parasitism viability 31 days after the product application, spinosad displayed similar viability for almost species 24 days after the application. The usefulness of Trichogramma parasitoids used as biological control agents, in olive tree ecosystem, was discussed in integrated pest management programs for Prays oleae control when parasitoid species were exposed during pupal stage to the insecticide residue.

关键词： Insecticide Effect Trichogramma Species Olive Tree Parasitism Viability Emergence Time

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ACOUSTIC ANALYSIS OF HYDRODYNAMIC AND ELASTO-HYDRODYNAMIC OIL LUBRICATED JOURNAL BEARINGS

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Journal of Hydrodynamics 2012年第2期24卷 250-256页

作者： bouaziz Slim FAKHFAKH Tahar HADDAR mohamed Dynamic of Mechanical Systems Research Unit (UDSM) University of Sfax Mechanics Modelling and Production Research Unit (U2MP) and National School of Engineers of Sfax (ENIS) BP.11733038University of Sfax

The purpose of the present paper is to investigate the effect of elastic deformation of bearing liner on the acoustic behavior of oil lubricated journal *** is performed for hydrodynamic（HD） and elasto-hydrodynamic （EHD） *** behavior and acoustical properties are investigated through an analysis of pressure fluctuation calculated from the Reynolds equation governing the flow in the clearance space of the journal *** is solved numerically using the finite difference method with the successive over relaxation *** elasto-hydrodynamic lubrication,the finite element method with in iteration scheme is adopted to solve both Reynolds equation and the three-dimensional elasticity equation representing the displacement field in the bearing *** results show that the sound pressure level of the bearing is markedly influenced by the flexibility of the bearing liner,the viscosity of lubricant and the load applied to *** analysis shows that the journal centre＇s orbit,from a disturbed position,converges to the static equilibrium position faster than EHD *** results of the present paper could aid in the design of low-noise rotor-bearing systems supported by oil lubricated journal bearings.

关键词： vibration amplitude pressure level lubricated bearing sound pressure

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HYDRODYNAMIC AND ELASTOHYDRODYNAMIC STUDIES OF A CYLINDRICAL JOURNAL BEARING

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Journal of Hydrodynamics 2010年第2期22卷 155-163页

作者： ATTIA HILI Molka bouaziz Slim MAATAR mohamed FAKHFAKH Tahar HADDAR mohamed Mechanics Modelling and Production Research Unit (U2MP)National School of Engineers of Sfax(ENIS)BP.11733038sfaxTunisia

In this article,the effect of the bearing elastic deformation on the performance characteristics of a cylindrical journal bearing is *** variety of simulation models covers hydrodynamic（HD） and elastohydrodynamic（EHD） lubrication *** Reynolds equations governing the flow in the clearance space of the journal bearing are obtained by considering the effect of mass transfer across the fluid *** finite element method with an iteration scheme was employed to solve both the Reynolds equation and the three-dimensional elasticity equation representing the displacement field in the bearing *** converged solutions for the lubricant flow and elastic deformation vector are *** characteristics of the journal bearing are computed for HD and EHD *** simulation results show that the flexibility of bearing liner has a significant influence on the performance of a cylindrical journal ***,the elastic deformations of the bearing liner extend the pressure area in the bearing and increase the minimum film ***,dynamic coefficient,load capacity and attitude angle decrease.

关键词： Reynolds equation hydrodynamic(HD) and elastohydrodynamic(EHD) lubrication theories dynamic coefficients relative eccentricity deformation coefficient

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锰对碳素马氏体钢的强度和应变硬化的影响

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水钢科技 2014年第1期 57-62页

作者： Artem ARLAZAROV Olivier bouaziz Alain HAZOTTE mohamed GOUNE Sebastien ALLAIN 张东升(译) 刘青(译) 高长益(译) 法国阿塞洛米塔尔钢铁研究与发展中心法国巴黎矿业大学材料研究中心法国洛林大学材料微观结构与性能实验室法国波尔多化学与材料研究所

应用各种碳锰钢的文献资料和试验数据分析研究了碳和锰对马氏体力学性能的复合效应，探讨了碳和锰对马氏体的强度和应变硬化的协同作用，并采用连续组合法建立了碳-锰协同作用模型，该模型经过一个参变量修正后，所预测的应力-应变曲线... 详细信息

应用各种碳锰钢的文献资料和试验数据分析研究了碳和锰对马氏体力学性能的复合效应，探讨了碳和锰对马氏体的强度和应变硬化的协同作用，并采用连续组合法建立了碳-锰协同作用模型，该模型经过一个参变量修正后，所预测的应力-应变曲线与试验得到的应力-应变曲线稳合。

关键词：马氏体碳中锰应变硬化建模

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