Free vibration analysis of angle-ply laminated composite and soft core sandwich plates

Meriem Sahla,Hayat Saidi,Kada Draiche,Abdelmoumen Anis Bousahla,Fouad Bourada,Abdelouahed Tounsi 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.33 No.5

In this work, a simple four-variable trigonometric shear deformation model with undetermined integral terms to consider the influences of transverse shear deformation is applied for the dynamic analysis of anti-symmetric laminated composite and soft core sandwich plates. Unlike the existing higher order theories, the current one contains only four unknowns. The equations of motion are obtained using the principle of virtual work. The analytical solution is determined by solving the eigenvalue problem. The influences of geometric ratio, modular ratio and fibre angle are critically evaluated for different problems of laminated composite and sandwich plates. The eigenfrequencies obtained using the current theory are verified by comparing the results with those of other theories and with the exact elasticity solution, if any.

The Qur'an and the Culture of Knowledge

Anis, Ahmad 이슬람문화연구소 1999 이슬람문화 Vol.3 No.1

Analytical investigation of the cyclic behaviour of I-shaped steel beam with reinforced web using bonded CFRP

Anis I. Mohabeddine,Cyrus Eshaghi,José A.F.O. Correia,José M. Castro 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.4

Recent experimental studies showed that deep steel I-shaped profiles classified as high ductility class sections in seismic design international codes exhibit low deformation capacity when subjected to cyclic loading. This paper presents an innovative retrofit solution to increase the rotation capacity of beams using bonded carbon fiber reinforced polymers (CFRP) patches validated with advanced finite element analysis. This investigation focuses on the flexural cyclic behaviour of I-shaped hot rolled steel deep section used as beams in moment-resisting frames (MRF) retrofitted with CFRP patches on the web. The main goal of this CFRP reinforcement is to increase the rotation capacity of the member without increasing the overstrength in order to avoid compromising the strong column-weak beam condition in MRF. A finite element model that simulates the cyclic plasticity behavior of the steel and the damage in the adhesive layer is developed. The damage is modelled using the cohesive zone modelling (CZM) technique that is able to capture the crack initiation and propagation. Details on the modelling techniques including the mesh sensitivity near the fracture zone are presented. The effectiveness of the retrofit solution depends strongly on the selection of the appropriate adhesive. Different adhesive types are investigated where the CZM parameters are calibrated from high fidelity fracture mechanics tests that are thoroughly validated in the literature. This includes a rigid adhesive commonly found in the construction industry and two tough adhesives used in the automotive industry. The results revealed that the CFRP patch can increase the rotation capacity of a steel member considerably when using tough adhesives.

Syngas production via CO2 reforming of methane using Co-Sr-Al catalyst

Anis Hamza Fakeeha,Ahmed Sadeq Al-Fatesh,Muhammad Awais Naeem,Wasim Ullah Khan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2

The effect of addition of strontium in Co based catalysts during CO2 reforming of methane wasinvestigated in the temperature range 500–700℃. The Co/γ-Al2O3 supported catalysts with strontiumas a promoter (0–2.25 wt%) were prepared by incipient wet impregnation method. Numeroustechniques such as N2 adsorption–desorption isotherm, H2 temperature-programmed reduction (TPR),temperature-programmed desorption (TPD), X-ray diffraction (XRD), thermogravimetric analysis (TGA),Transmission Electron Microscopy (TEM), pulse chemisorption and temperature-programmed oxidation(TPO) were applied for characterization of fresh and spent catalysts. The results of characterizations andcatalyst activity test revealed that introduction of Sr in Co/γ-Al2O3 catalyst had significant effect onstability and coke suppression. The Sr addition improves the metal–support interaction as well asenhances the Lewis basicity of the catalyst. The improvement in basicity helps the chemisorption anddissociation of CO2 over the catalyst which in turn reduces carbon deposition.

Unsteady Single-Phase Natural Circulation Flow Mixing Prediction Using CATHARE Three-Dimensional Capabilities

Anis Bousbia Salah,Jacques Vlassenbroeck 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3

Coolant mixing under natural circulation flow regime constitutes a key parameter that mayplay a role in the course of an accidental transient in a nuclear pressurized water reactor. This issue has motivated some experimental investigations carried out within the OECD/NEA PKL projects. The aim was to assess the coolant mixing phenomenon in the reactorpressure vessel downcomer and the core lower plenum under several asymmetric steadyand unsteady flow conditions, and to provide experimental data for code validations. Formerstudies addressed the mixing phenomenon using, on the one hand, one-dimensionalcomputational approaches with cross flows that are not fully validated under transientconditions and, on the other hand, expensive computational fluid dynamic tools thatare not always justified for large-scale macroscopic phenomena. In the current framework,an unsteady coolant mixing experiment carried out in the Rossendorf coolant mixingtest facility is simulated using the three-dimensional porous media capabilities ofthe thermalehydraulic system CATHARE code. The current study allows highlighting thecurrent capabilities of these codes and their suitability for reproducing the main phenomenaoccurring during asymmetric transient natural circulation mixing conditions.

Experimental investigation of particle distribution in a flow through a stenosed artery

Anis Shuib,Peter Hoskins,William Easson 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2

The particle distribution of a dilute solid-liquid suspension through a stenosed arterial geometry was investigated. Particle image velocimetry (PIV) was used to determine the velocity as well as to acquire the flow images. The light intensity scattered by particles was evaluated to determine the particle distribution. Flow separation exists where the flow emerges from the stenosis throat. From the PIV images, the particle density distribution exhibited differing non-uniform characteristics which vary with flow rate, particle size and particle concentration. At low flow rates, a particle-free layer is formed. As the flow rate is increased, particles accumulate in concentric recirculation orbits within the downstream vortex. Particles with larger size and higher concentration tend to accumulate more towards the center of the vortex.

Alumina Recovery From Industrial Waste: Study on the Thermal, Tensile and Wear Properties of Polypropylene/Alumina Nanocomposites

Anis Sofia Sufian,Noorasikin Samat,Meor Yusoff Meor Sulaiman,Wilfred Paulus 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1

The investigation on the influences of alumina (Al2O3) particles in nano-sized retrieved from Aluminium (Al) dross was conducted on the tensile, thermal and wear properties of polypropylene (PP) composites. The thermal decomposition method was used to synthesise the micro α-Al2O3 particles from Al-dross, was followed by the wet-milling method to produce the nano α-Al2O3. The PP composites (nano and micro α-Al2O3 particles) were prepared via melt compounding followed by compression molding. The coupling agent was also added to facilitate the particle dispersion. The tensile tests showed the maximum tensile strength and Young’s modulus of both composites to be corresponding to the samples containing 5 wt% of α-Al2O3. The superiority of nano α-Al2O3 on improving the property of PP had also been evident in the abrasive wear performance. A small amount of α-Al2O3 had been adequate in enhancing the thermal stability of PP than that of neat PP. The study on tensile and worn surface with SEM had revealed better adhesion and interaction between the filler and matrix in composites that were treated with coupling agent. The recovery of nano α-Al2O3 particles from Al-dross potentially decreases the quantity of harmful solid waste and can be an effective alternative filler for thermoplastics.

Exploring English Teachers’ Challenges at Indonesian Vocational Schools amid the COVID-19 Pandemic: A Photovoice Study

Anis Rahmawati,Suwarno,Dina Rafidiyah,Fazri Nur Yusuf,Ahmad Kailani 아시아테플 2022 The Journal of Asia TEFL Vol.19 No.4

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Modification of alumina support with TiO2-P25 in CO2 reforming of CH4

Anis H. Fakeeha,Ahmed E. Abasaeed,Ahmed S.A. Al-Fatesh 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1

Catalyst activity and stability for CO2 reforming of CH4 depends specifically upon the support and the active metal. A side reaction of dry reforming of methane is the decomposition to carbon that covers the Ni particles causing catalyst deactivation. Hence, an appropriate combination of Ni with support is needed to allow for long term stable operation. In this paper, CO2 reforming of CH4 is studied by investigating the effect of addition of TiO2-P25 separately to g-Al2O3 and a-Al2O3 supports used for nickel based catalyst. The reforming reactions are performed using (CO2:CH4) feed ratio of 1:1 and reaction temperature range of 500–800 8C. Both fresh and used catalysts are characterized by SEM and TGA techniques. It is found when a-Al2O3 support is modified with 20 wt% TiO2-P25, the catalyst activity and stability is enhanced. The conversion rates of CH4 and CO2 without and with 20 wt% TiO2-P25,respectively, are changed from 72.3% to 76.7% and 73.3% to 81.2%, respectively, and, most importantly,carbon formation is reduced from 28.1 to 12.8, respectively. However, when g-Al2O3 support is modified with TiO2-P25, the catalyst activity is enhanced with simultaneous increase in carbon formation.

Some Insights on Combined Turning-Burnishing (CoTuB) Process on Workpiece Surface Integrity

Anis Rami,Fathi Gharbi,Salem Sghaier,Hedi Hamdi 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.1

This paper deals with a combined manufacturing process called Combined Turning-Burnishing (CoTuB) that performs turning and ball-burnishing simultaneously on the same machine tool. This innovative process aimed to enhance surface quality and integrity by exploiting rough turning conditions. Consequently, this implies an increase in productivity when compared to conventional surface treatment processes. For this reason, a device was manufactured in order to hold both commercial cutting and burnishing tools to carry out the removal material and the surface mechanical treatment processes simultaneously and under the same operation. As the design of CoTuB device sets the cutting tool ahead of the ball, turning is followed by burnishing operation along the manufactured surface. It has been depicted experimentally that a considerable improvement in surface quality could be achieved using the new combined process under suitable process parameters. Burnishing force, Ball burnishing diameter and depth of cut are independent parameters. In order to carry out a parametric process study, several experiments based on Taguchi method were performed. The aim is to identify the optimal turning/burnishing parameters when treating AISI 4140 steel. This helps to get a compromise between the optimal arithmetic surface roughness (Ra), the compressive residual stress state and the micro-hardness (μH).