Hassan Ijaz

Hassan Ijaz
Coventry University | CU · Department of Mechanical and Automotive Engineering

PhD

About

46
Publications
12,662
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478
Citations
Introduction
Dr. Hassan Ijaz has been working as a research scientist for the last 15 years and has a diverse and rich experience both at industrial and academia level. Currently, he is actively involved in Academic research, which mainly encompasses Damage mechanics, Failure analysis, Mechanics of composite materials and Finite element analysis for static, fatigue and dynamic loading conditions. He completed his PhD degree in 2009 from Ecole Centrale de Nantes (ECN), France and have industrial experience in

Publications

Publications (46)
Article
Cutting simulations for chamfered-edge and honed-edge tools for rough-to-semi finishing operations in machining an aerospace grade aluminum alloy AA2024 have been presented in this work. A finite element based approach has been developed to comprehend and investigate the relative effects of various cutting edge ge-ometries on chip morphology, end-b...
Article
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Magnesium alloys are widely used in numerous engineering applications owing to their superior structural characteristics. However, the machining of magnesium alloy is challenging because of its poor machinability characteristics. Therefore, this paper investigates the machining of magnesium alloys under different sustainable cooling conditions. The...
Article
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Magnesium alloys are biocompatible materials that are not only used in biomedical implants but also in many engineering load-bearing applications due to their high strength to density ratio. However, machining of these alloys is somehow challenging, for example, magnesium alloy (AZ31B) is prone to ignition risk at relatively low temperatures during...
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A finite element based numerical model to simulate orthogonal machining process and associated burr formation process has been developed in the presented work. To incorporate simultaneous effects of mechanical and thermal loadings in high speed machining processes, Johnson and Cook`s thermo-visco-plastic flow stress model has been adopted in the co...
Article
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This research work presents a numerical study of the orthogonal cutting process employing a finite element approach to optimize dry machining of aluminium alloy 2024. The main objective of the research work is to perform three-dimensional finite element simulations for a better understanding of temperature distribution and residual stresses develop...
Article
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Micro-turning is a micro-mechanical cutting method used to produce small diameter cylindrical parts. Since the diameter of the part is usually small, it may be a little difficult to improve the surface quality by a second operation, such as grinding. Therefore, it is important to obtain a good surface finish in the micro turning process using the i...
Article
An insight into comprehension and optimization of exit burr formation in orthogonal machining case is presented in the work. Formation of exit burr has been simulated using a three dimensional FE based machining model. Variation of “pivot-point” (point of maximum bending stress, appearing at workpiece exit edge) location on workpiece end and its ap...
Article
This research work deals with the numerical modeling and analysis of macro- to microscaled milling of a strain rate-sensitive alloy AA2024T351. The milling computations of a semicircular slot are performed in Abaqus/Explicit by employing the Johnson–Cook thermo-elasto viscoplastic material damage model. The Coulomb friction model is applied at the...
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This contribution presents three-dimensional turning operation simulations exploiting the capabilities of finite element (FE) based software Abaqus/Explicit. Coupled temperature-displacement simulations for orthogonal cutting on an aerospace grade aluminum alloy AA2024-T351 with the conceived numerical model have been performed. Numerically compute...
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Industrial boilers simulation can serve number of purposes like training, optimization, HAZOP studies, and incident investigation. Simulation including trip logics, interlockings, safety devices, start‐up and shutdown procedure is presented in this work. Simulation is directly accomplished in dynamic mode to benefit from the holdup approach to avoi...
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Delamination crack growth is a major source of failure in composite laminates under static and fatigue loading conditions. In the present study, damage mechanics based failure models for both static and fatigue loadings are evaluated via UMAT subroutine to study the delamination crack growth phenomenon in Glass Fiber Reinforced Plastic (GFRP) compo...
Article
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The identification and selection of different physical parameters greatly influence the machining of materials. Cutting speed, feed, tool rake angle and friction are important physical parameters that affect the machining of the materials. Selection of suitable cutting parameters can help to achieve the better machining quality and enhanced tool li...
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Timely accomplishment of production targets is a challenging task in low volume–high variety environment. Assessment of the manufacturing flexibility of a production system assists in achieving the desired objectives. In this research, the operational flexibility of a production system is investigated which operates under the low-volume high-variet...
Article
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Glass fibre-reinforced plastic (GFRP) composite laminates are used in many industries due to their excellent mechanical and thermal properties. However, these materials are prone to the initiation and propagation of delamination crack growth between different plies forming the laminate. The crack propagation may ultimately result in the failure of...
Article
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Turning modeling and simulation of different metallic materials using the commercially available Finite Element (FE) softwares is getting prime importance because of saving of time and money in comparison to the costly experiments. Mostly, the numerical analysis of machining process considers a purely isotropic behavior of metallic materials; howev...
Article
Cost and recyclability are among the primary factors on exploiting the engineering materials for their new applications. In this context, glass/pp based sandwich panel has been studied experimentally and numerically with the aims of its potential applications in the automotive structures. The first part of this work presents the experimental result...
Article
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Copper/diamond (Cu/D) composites are famous in thermal management applications for their high thermal conductivity values. They, however, offer some interface related problems like high thermal boundary resistance and excessive debonding. This paper investigates interfacial debonding in Cu/D composites subjected to steady-state and transient therma...
Article
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In dry turning operation, various parameters influence the cutting force and contribute in machining precision. Generally, the numerical cutting models are adopted to establish the optimum cutting parameters and results are substantiated with the experimental findings. In this paper, the optimal turning parameters of AA2024-T351 alloy are determine...
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The purpose of this article is to present a simplified methodology for analysis of sandwich structures using the homogenization method. This methodology is based upon the strain energy criterion. Normally, sandwich structures are composed of hexagonal core and face sheets and a complete and complex hexagonal core is modeled for finite element (FE)...
Article
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Mechanical properties of the metals and their alloys are influenced by the material grain size at microscale. In the present study, the Johnson-Cook (JC) material model is modified to incorporate the effect of material's grain size along with the plasticity coupled damage model. 2D finite element (FE) simulations of turning process of an aerospace...
Article
Dimensional instability in machined aerospace parts is a complex engineering problem which is contributed by many factors. Mainly, the machining stresses developed during the part’s material cutting, cause dimensional imperfections. The complex interaction of mechanical, thermal, and metallurgical transformations makes it difficult to establish the...
Article
Aerospace aluminum alloys have gained the prime significance due to their excellent machining characteristics. Numerous experimental and numerical studies have been conducted to establish the optimum cutting parameters of these alloys. In the numerical cutting models, the authenticity of computational results is suspected particularly because of th...
Article
This work presents a computational method for the identification of the thermal conductivity of a powdered composite. The thermo-physical properties of powdered composites depend not only upon the intrinsic material properties of the filler and the matrix, but also upon several other parameters including the packing density, the particle shape fact...
Article
Full-text available
The understanding of physical parameters of machining processes of aerospace grade aluminium alloy is always of prime importance. The main concern is always to understand the chip formation process and the resultant cutting force experienced by the tool due to different parameters like cutting speeds, feed rate, friction coefficient and tool rake a...
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Preforming simulation for structural composite processing can significantly assist in the development of forming tools, prediction of manufacturing issues, optimization of process parameters and structural design analysis. The present study is aimed at investigating the influence of some important parameters in composite forming using a hypoelastic...
Article
Preforming simulation for structural composite processing can significantly assist in the development of forming tools, prediction of manufacturing issues, optimization of process parameters and structural design analysis. The present study is aimed at investigating the influence of some important parameters in composite forming using a hypoelastic...
Article
Full-text available
Materials for thermal management application require better control over the thermophysical properties, which has largely been achieved by fabricating powdered composite. There are, however, several factors like filler volume fraction, shape morphology, inclusion size, and interfacial thermal resistance that limit the effective properties of the me...
Article
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The use of composite laminates is increasing in these days due to higher strength and low density values in comparison of metals. Delamination is a major source of failure in composite laminates. Damage mechanics based theories are employed to simulate the delamination phenomena between composite laminates. These damage models are inherently local...
Article
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The fatigue life of a large-scale 5MW composite wind turbine blade is carried out in accordance with the simplified stress-based fatigue life estimation method recommended by Germanischer-Lloyd regulations. Two kinds of composite layups, ply-level and laminate-level, for the blade are developed and evaluated. The fatigue loads are computed from aer...
Article
Structural topology optimization (STO) has emerged a thriving technique to determine the optimal concept design of mechanically loaded structures. Optimized configuration can be evolved by meeting the objective of optimal material distribution in allocated design domains under strength and stiffness constraints. In this paper, STO technique is emph...
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The purpose of present study is to present a methodology to determine the effective elastic properties of sandwich structures. This methodology is based on strain energy based criteria. Sandwich structures contain core material and face sheet. Earlier work in this domain contains the homogenization of core material and determining its equivalent...
Article
Full-text available
The use of composite laminates is increasing in these days due to desired directional properties and low densities in comparison of metals. Delamination is a major source of failure in composite laminates where a crack like entity can initiate and propagate between different layers of composite laminates under given loading conditions. Damage mecha...
Article
Full-text available
For qualitative prediction of chip morphology and quantitative prediction of burr size, 2D and 3D finite element (FE) based turning models have been developed in this paper. Coupled temperature-displacement machining simulations exploiting the capabilities of Abaqus (R) with a particular industrial turning insert and a newly proposed geometrical ve...
Article
Full-text available
The purpose of present study is to present a methodology to determine the effective elastic properties of sandwich structures. This methodology is based on strain energy based criteria. Sandwich structures contain core material and face sheet. Earlier work in this domain contains the homogenization of core material and determining its equivalent or...
Article
Full-text available
This article presents the development of two-dimensional and three-dimensional finite element–based turning models, for better prediction of chip morphology and machined surface topology. Capabilities of a commercial finite element code Abaqus�/Explicit have been exploited to perform coupled temperature–displacement simulations of an aerospace grad...
Article
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The global behavior of composite materials is strongly influenced by the quality of adhesion between different components. A component can be single phase, like fibers or particles used as reinforcement in a homogenous matrix, or a multiphase material like a layer in long-fiber laminate. In the latter case the degradation of adhesion implies the se...
Article
Internally pressurized tape wound composite shells of revolution with plugged ends are immensely utilize in commercial and aerospace applications. The focus of present endeavor is the realistic design of composite shells. A balanced symmetric stacking sequence of glass/epoxy has been considered. Its mechanical properties are determined from the exp...
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This paper presents the mathematical modelling of fatigue damage able to carry out simulation of evolution of delamination in the laminated composite structures under cyclic loadings. A new elastic fatigue damage evolution law is proposed here. A classical interface damage evolution law, which is commonly used to predict static debonding process, i...
Article
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: This article presents the development of a fatigue damage model which helps to carry out simulation of the evolution of delamination in the laminated composite structures under cyclic loadings. A classical interface damage evolution law, which is commonly used to predict the static debonding process, is modified further to incorporate fatigue del...
Article
This paper presents the development of a fatigue damage model able to carry out simulation of evolution of delamination in the laminated composite structures under cyclic loadings. A classical interface damage evolution law, which is commonly used to predict static debonding process, is modified further to incorporate fatigue delamination effects d...
Conference Paper
Full-text available
Among all different failure mechanisms, 'Delamination' is considered to be the most prominent mode of failure in fiber-reinforced laminates as a result of their relatively weak inter-laminar strength. When laminated structures are subjected to static, dynamic or cyclic loadings, the inter-laminar adhesion strength between individual plies tends to...
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This article presents the implementation of a new inelastic damage model able to carry out simulation of initiation and evolution of damage in the Z-pinned laminated composite structures with friction effects. The classical elastic damage model is modified to an inelastic model with friction effects obeying the simple Coulomb friction criterion. Th...
Thesis
Full-text available
Composites are engineered materials made from the addition of different materials called matrix and reinforcements. The function of the reinforcement is to take into account the mechanical strength and the role of the matrix is a complementary one since it has to set cohesion between reinforcements. The greatest advantage of composite materials is...
Article
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Un modèle d'interface inter-laminaire est proposé pour modéliser les phénomènes de délaminage survenant sous l'action des sollicitations de fatigue dans les matériaux composites stratifiés carbone époxy. Les paramètres de ce modèle sont identifiés à l'aide d'essais DCB, ENF et d'essais en mode mixte réalisés sur des matériaux unidirectionnels HTA/6...
Conference Paper
Full-text available
RESUME L'objectif de ce travail est de proposer et de mettre en oeuvre des modèles numériques destinés à décrire le renforcement hors plan des stratifiés carbone époxy par un réseau de Z-fiber (T300/BMI). Ces modèles sont identifiés pour les matériaux unidirectionnels IM7/977-2 et AS4/8552. L'interface est une entité surfacique qui assure le transf...

Questions

Question (1)
Question
In fact i want to simulate a situation where a stationary nozzle is spraying cold liquid on moving body OR in opposite case we can say that a moving nozzle is spraying cold liquid on stationary body.
My Target is to apply this thermal load assuming convection heat transfer problem in Abaqus without using any user subroutine.
Thank you for your time and response.

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