Transient Combustion Analysis for Iron Micro-Particles in a Gaseous Oxidizing Medium Using Adomian Decomposition Method
Gbeminiyi
Sobamowo
Department of Mechanical Engineering, University of Lagos, Nigeria
author
Ahmed
Yinusa
Department of Mechanical Engineering, University of Lagos, Nigeria
author
text
article
2018
eng
The present study presents analytical solution to transient combustion analysis for iron micro-particles in a gaseous oxidizing medium using Adomian decomposition method. The analytical solutions obtained by the Adomian decomposition method are verified with those of the fourth order Runge–Kutta numerical method. Also, parametric studies are carried out to properly understand the chemistry of the process and the associated burning time. Thermal radiation effect from the external surface of burning particle and variations of density of iron particle with temperature are considered. Furthermore, the results show that by increasing the heat realized parameter, combustion temperature increased until a steady state is reached. This work will be useful in solving to a great extent one of the challenges facing industries on combustion of metallic particles such as iron particles as well as in the determination of different particles burning time.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
1
15
https://www.jcepm.com/article_61590_9c1de078386cf3d56f5b83ea8fe94d17.pdf
dx.doi.org/10.22115/cepm.2018.122052.1012
A Moving Cohesive Mesh Formulation to Predict Debonding Phenomena in Layered Structures
Marco Francesco
Funari
Department of Civil Engineering, University of Calabria, Via P. Bucci Cubo 39B, 87036, Rende, Cosenza, Italy
author
Paolo
Lonetti
Department of Civil Engineering, University of Calabria, Via P. Bucci Cubo 39B, 87036, Rende, Cosenza, Italy
author
Arturo
Pascuzzo
Department of Civil Engineering, University of Calabria, Via P. Bucci Cubo 39B, 87036, Rende, Cosenza, Italy
author
text
article
2018
eng
A new numerical formulation, which combines the Cohesive Zone Model (CZM) approach with the Arbitrary Lagrangian-Eulerian (ALE) methodology to investigate the crack onset and evolution of multilayer composite beams is presented. The CZM approach is used to calculate the main variables, which governs the conditions of onset and propagations of delamination, whereas the ALE formulation is employed to simulate the evolution of the crack growth. In spite of numerical methodologies based on pure CZM, the proposed formulation guarantees lower computational efforts since a reduced number of finite elements is required to reproduce delamination mechanisms. Moreover, the proposed model is able to introduce the nonlinearity only in a small region around the crack tip, whereas in the remaining one, linear equations to simulate perfect adhesion are introduced. In order to verify the accuracy and to validate the proposed formulations, comparisons with existing formulations available in literature are proposed. Moreover, a parametric study to evaluate the delamination phenomena in dynamic and the contributions arising from through-thickness reinforcements, such as Z-pin elements, is performed.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
16
26
https://www.jcepm.com/article_63631_936c80f8774464330030a262fed3aa82.pdf
dx.doi.org/10.22115/cepm.2018.132122.1028
Debonding and Fracture Behavior of Concrete Specimens Retrofitted by FRP Composite
Hadi
Abbaszadeh
M.Sc. Student, Faculty of Civil Engineering, Istanbul Technical University, Istanbul, Turkey
author
Ali
Ahani
M.Sc. Student, Faculty of Civil Engineering, Istanbul Technical University, Istanbul, Turkey
author
M.Reza
Emami Azadi
Assistant Professor, Faculty of Civil Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
author
text
article
2018
eng
The effects of FRP retrofitted concrete specimens with couple of notches on the fracture behavior have been investigated during an experimental and analytical test program in this study. This paper represents the fracture characteristics and parameters for three point bending tests on two distinguish retrofitted and plain condition for both intact and notched (couple notches) specimens. The experimental test results find out in the laboratory tests indicated that for intact concrete specimens, there would be approximately 285% increase in ultimate flexural strength tests. The experimental results also represents that for the tested couple notched concrete specimens, there might be approximately 318% increase in ultimate flexural strength. Based on the analytical study, it is found that the near failure behavior of the notched specimens have been significantly improved using FRP retrofit of such specimens. The system`s global energy balance and failure load prediction of FRP debonding are the couple of consideration by a developed fracture mechanics based model which made by energy dissipation major mechanisms characterizing while debonding. Model verification is provided using previous researches experimental data from literature. In addition, fracture mechanics parameters were found out for three point bending test in this paper for better understanding on fracture behavior and fracture properties of intended specimens.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
27
40
https://www.jcepm.com/article_63674_332a1a67f6a5607a03e3a8e9b0a29cf5.pdf
dx.doi.org/10.22115/cepm.2018.125309.1015
Efficient Configuration of Storage Rack System as Per Nonlinear Static Pushover Analysis under Triangular and Uniform Pattern of Lateral Loading Pattern
Chandrakant
Thombare
Applied Mechanics Department, Cusrow Wadia Institute of Technology Pune, Maharashtra, India
author
Keshav
Sangle
Professor, Structural Engineering Department, Veermata Jijabai Technological Institute, Matunga, Mumbai, India
author
Vinod
Mohitkar
Director, Maharashtra State Board of Technical Education, Bandra (East) Mumbai, India
author
Swapnil
Kharmale
Assistant Professor, Applied Mechanics, Government College of Engineering and Research, Avasari (Kd), Pune, Maharashtra, India
author
text
article
2018
eng
The individual components of cold-formed storage rack system are most vulnerable to local and torsional buckling lateral loads in addition to under gravity. Deterministic allotment of strength and ductility in the structural components and performance evaluation of appropriate techniques is considered in the capacity based design of cold-formed pallet rack system. Nonlinear time history analysis (NTHA) and nonlinear static pushover analysis (NSPA) are most commonly followed techniques for seismic performance evaluation of any structural systems. Although, NTHA is the most correct technique of seismic demand forecasting and performance evaluation, it is computationally heavy and even requires the selection and application of relevant set of ground excitations. A simple method for the nonlinear static analysis of complicated structures subjected to gradually increasing lateral loads (pushover analysis) is presented here. This paper presents investigation of efficient configuration of conventional pallet racking system on the basis of seismic performance by using NSPA. Finite element models of two different configurations of conventional pallet racking system are prepared and analyzed on the general purpose FE platform using ABAQUS 6.12 under monotonic unidirectional lateral loads. Results show that conventional pallet racking system with horizontal and inclined bracing is more efficient as evidenced from a fair judgment of the overall displacement, base shear and yielding demands.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
41
58
https://www.jcepm.com/article_65567_1c8088ac32d344abbdeb62a93598af07.pdf
dx.doi.org/10.22115/cepm.2018.125616.1017
Buckling of Tapered Columns with Polygon Cross-Section
Magdy
Salama
Civil Engineering Dept., Faculty of Engineering, Kafrelsheikh University, Kafelshekh, Egypt
author
text
article
2018
eng
This paper is concerned with the elastic stability of slender tapered columns of regular polygon cross-section with constant volume is presented. Various end conditions of the tapered columns such as pinned ends, clamped -pinned ends and clamped ends are considered in this paper. The analysis is developed using finite element method for linear, parabolic and sinusoidal tapers assuming firstly circular cross-section. The polygon cross-sections other the circular one are studied by investigating a direct relation between the side number of the polygon cross-section and the critical load parameter. The main parameter in this study is the section ratio that defined as the ratio between the section depths at the mid-span of the considered column to that at the column ends. The obtained numerical results are introduced in many curves to describe the relation between the buckling load and the section ratio considering linear, parabolic and sinusoidal tapers and various side number of the polygon cross-section for each end conditions. The obtained results of the buckling factor are simple with satisfactory accuracy compared with results that obtained in other theoretical studies.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
59
69
https://www.jcepm.com/article_64828_756be46455f3ebb7cc5c83d556599fcc.pdf
dx.doi.org/10.22115/cepm.2018.136082.1032
Design and Evaluation of Drip Irrigation System for Date Palm Plantations in MAUTECH, Yola, Adamawa State, Northeastern Nigeria
Buba
Ankidawa
Department of Agricultural and Environmental Engineering, School of Engineering and Engineering Technology, Modibbo Adama University of Technology, Yola, Nigeria
author
D.
Zakariah
Department of Agricultural and Environmental Engineering, School of Engineering and Engineering Technology, Modibbo Adama University of Technology, Yola, Nigeria
author
text
article
2018
eng
Irrigation using dripping system is often considered more efficient method in terms of both water application and labour. The research is aimed at design and evaluating the drip irrigation system for the Date Palm Plantations in MAUTECH, Yola, Adamawa State, Northeastern Nigeria. The drip irrigation system was designed using locally available materials, installed and tested on an area of 400 m by 100 m dimensions in the research area. The result of the elevation survey using ProMark3 GPS System shows that the elevation across the research area gives a slope of 0.02% which moderately gives water flows by gravity through the pipes to the date palms. The particle size analysis result shows that the soil on the research area ranges from sand to sandy loam, this type of soil is suitable for the Date Palms. The result of the infiltration rate was estimated to be 208.27 mm/hr. The discharge of the dripper was estimated as 2.265 l/s through the velocity of 1.82 m/s under the pressure head of 8.02 m. The water application uniformity was found to be above 90% which describes that the drip irrigation system was designed on proper scale and dimensions. The performance evaluation of the drip irrigation system was carried out in the field after design process and the result shows that the emitters are discharging water effectively to the date palm plantations. However, some linkage problems were observed along the lateral pipes and were fixed to avoid water wastages.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
70
82
https://www.jcepm.com/article_65592_775680a6eef9d23b4ed2ed7f696d8ef3.pdf
dx.doi.org/10.22115/cepm.2018.134525.1030
Use of Tuned Mass Dampers in Controlling the Vibrations of Steel Structures with Vertical Irregularity of Mass
Mehdi
Babaei
Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
author
Alireza
Moniri
Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
author
text
article
2018
eng
One of the common methods of the inactively controlling structures subject to earthquakes is the use of Tuned Mass Damping (TMD) systems. These dampers consist of three major parameters, namely mass, damping and stiffness. TMDs generally reduce the response domain by influencing a mode, which is most often the first mode of the structure. Since the TMD parameters remain constant during vibrations, it is very important to tune them correctly and optimally. In this study, a ten-story structural model with mass irregularities has been investigated. The mass ratio for the mass damper is assumed to be at 2%. Considering a nonlinear structure, to tune the frequency of the mass damper to its optimum value, proposed experimental relationships have been used.Both regular and irregular structures have been subjected to seven near-field and far-field earthquakes and amplified dynamic analysis from 0.1g to 1.0g with 0.1g steps and mass dampers has been used to evaluate the structural behavior. Based on the analyses outcomes, it can be seen that the TMD in structures with mass irregularities shows a better performance in the first 5 floors compared to the absence of dampers. In addition, by creating mass irregularities in the floor levels, the structure becomes more prone to damages in near-field earthquakes and the performance of the TMDs is better in earthquakes of far-field nature.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
1
v.
2
no.
2018
83
94
https://www.jcepm.com/article_65078_f11bc5b96cc7ae0a257316bcb5229d3e.pdf
dx.doi.org/10.22115/cepm.2018.137303.1035