Resam Makvandi

Resam Makvandi
Otto-von-Guericke-Universität Magdeburg | OvGU · Institute of Mechanics

Doctor of Engineering

About

39
Publications
2,930
Reads
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108
Citations
Additional affiliations
November 2014 - December 2021
Otto-von-Guericke-Universität Magdeburg
Position
  • Research Assistant
Education
November 2014 - November 2021
Otto-von-Guericke-Universität Magdeburg
Field of study
  • Computational Mechanics
September 2011 - September 2013
Universiti Teknologi Malaysia
Field of study
  • Mechanical Engineering
October 2006 - December 2010
Islamic Azad University Ahvaz Branch
Field of study
  • Mechanical Engineering

Publications

Publications (39)
Article
The application of carbon nanotubes (CNTs) in innumerable areas of industry is increasing day-to-day. One of their most important applications is in composite materials as the reinforcing phase. Many researchers studied the behavior of composite materials reinforced with short fibers. This paper examines the effect of the position of short fibers o...
Article
The application of carbon nanotubes as the reinforcing phase in composite materials is considered. A literature review in regards to the simulation approaches that have been done in order to study the behavior of nanotube-reinforced composites from several aspects is provided. After that, a new approach for investigating the mechanical properties o...
Article
Full-text available
The elastic energy in the conventional Cauchy continuum model depends on the gradient of the displacement field, which is not adequate to show the behavior of a system under point and line forces. Applying these kinds of boundary conditions to the continuum will lead to singularities. To overcome this problem, a generalization of the Cauchy continu...
Article
Full-text available
The influences on the development of polymer blend microstructures are not yet fully understood in the manufacturing processes. The purpose of this paper is to give a closer look at the effect of the elastic energy on the decomposition process. The decomposition process of a melt consisting of two polymers with different shear moduli is investigate...
Preprint
Full-text available
The conventional phase-field crack propagation models utilize the classical Cauchy continuum theory to approximate the elastic energy contribution to the total potential energy. It is widely known that the stress fields in the classical theory suffer from singularities at the crack tips. Therefore, the inherent purpose of this contribution is to de...
Chapter
This chapter introduces first the theory to derive the elemental stiffness matrix of thick or shear deformable plate elements, i.e., elements which can be loaded and deformed perpendicular to the plane and which account for a shear distribution on the deformation. Then, the principal finite element equation of such shear deformable plate elements a...
Chapter
This chapter introduces first the theory to derive the elemental stiffness matrix of thin or classical plate elements, i.e., elements which can be loaded and deformed perpendicular to the plane. Then, the principal finite element equation of such classical plate elements and their arrangements as plane structures are covered. Only four-node element...
Book
This book is intended as a study aid for the finite element method. Based on the free computer algebra system Maxima, we offer routines to symbolically or numerically solve problems from the context of two-dimensional problems. For this rather advanced topic, classical ‘hand calculations’ are difficult to perform and the incorporation of a computer...
Chapter
This chapter provides the commented and structured source codes of the main Maxima library file which contains all the written routines, as well as the Python source code for the graphical user interface.
Chapter
This chapter introduces the application of a graphical user interface (GUI), which allows a different way of providing the required data to define a model and to execute the calculation. The GUI is written using wxPython, a cross-platform GUI API for the Python programming language, under consideration of particular libraries. The GUI allows to exp...
Chapter
This chapter summarizes a few basic operations of the computer algebra system Maxima, as well as the internet links to download the software. The few topics covered are basic arithmetics, definition of variables and functions. For a comprehensive introduction, the reader is referred to the available literature.
Chapter
This chapter introduces first the theory to derive the elemental stiffness matrix of plane elasticity elements, i.e., elements which can be loaded and deform only in-plane. Then, the principal finite element equation of such plane elements and their arrangements as plane element structures is covered. Four- and three-node elements are covered and t...
Article
Full-text available
Phase-field modelling has been shown to be a powerful tool for simulating fracture processes and predicting the crack path under complex loading conditions. Note that the total energy of fracture in the classical phase-field formulations includes the strain energy density from the linear elasticity theory resulting in singular stresses at the crack...
Thesis
Originally, the classical continuum mechanics theories are supposed to determine deformations in ranges from millimeter to meter at the so-called macroscopic scales. In fact, these models are approximations of physical systems neglecting the underlying microstructure. For instance, a Cauchy continuum, i.e., a continuum with an elastic energy determ...
Article
Full-text available
The application of generalized continuum mechanics is rapidly increasing in different fields of science and engineering. In the literature, there are several theories extending the classical first‐order continuum mechanics formulation to include size‐effects [1]. One approach is the strain gradient theory with the intrinsic features of regularizing...
Article
In this article, the condition number of the stiffness matrix κ(K) is compared for three high order finite element methods (FEMs), i.e., the p-version of the FEM, the spectral element method (SEM), and the NURBS-based isogeometric analysis (IGA). Note that only problems in linear elasticity are considered in the analysis. It is well-known that the...
Chapter
This chapter provides the commented and structured source code of the main Maxima file which contains all the written routines.
Chapter
The following Listing 6.1 shows the entire wxMaxima code for the determination of the minimum.
Chapter
This chapter introduces two classical methods for the numerical determination of the minimum of unimodal functions of one variable. The exterior and the interior penalty function methods are described. Based on a pseudo-objective function, the problem can be treated as an unconstrained problem as covered in the previous chapter.
Chapter
This chapter introduces two classical numerical methods to find the minimum of a unimodal function of several variables. The first method, i.e., the steepest descent method, is a typical representative of first-order methods which requires functional evaluations of the objective function and the calculation of the gradient operator. The second meth...
Chapter
This chapter introduces three classical numerical methods to find the minimum of a unimodal function of one variable. The first two methods, i.e., the golden section algorithm and the brute-force algorithm, are typical representatives of zero-order methods which only require functional evaluations of the objective function. The third method, i.e.,...
Chapter
This chapter introduces a classical method for the numerical determination of the minimum of unimodal functions of several variable. The exterior penalty function method is described as a typical and efficient method to numerically solve such problems. Based on a pseudo-objective function, the problem can be treated as an unconstrained problem as c...
Book
This study aid on numerical optimization techniques is intended for university undergraduate and postgraduate mechanical engineering students. Optimization procedures are becoming more and more important for lightweight design, where weight reduction can, for example in the case of automotive or aerospace industry, lead to lower fuel consumption an...
Article
Full-text available
The simulation of crack propagation has always been a challenging task from a computational point of view. In the past, many mathematical and mechanical assumptions had to be taken into account to successfully simulate this process. The problem of tracking the sharp crack surface was among the first issues which was alleviated by the introduction o...
Article
Full-text available
The classical continuum mechanics theories are originally supposed to determine deformations in ranges from millimeter to meter, the so‐called macroscopic scale. In fact, these theories are approximations of physical systems neglecting the underlying microstructure. For instance, a Cauchy continuum, i.e. a continuum with an elastic energy determine...
Article
The conventional phase-field crack propagation models utilize the classical Cauchy continuum theory to approximate the elastic energy contribution to the total potential energy. It is widely known that the stress fields in the classical theory suffer from singularities at the crack tips. Therefore, the inherent purpose of this contribution is to de...
Chapter
This chapter summarizes a few basic operations of the computer algebra system Maxima, as well as the internet links to download the software. The few topics covered are basic arithmetics, definition of variables and functions etc. For a comprehensive introduction, the reader is referred to the available literature.
Chapter
This chapter provides the commented and structured source code of the main Maxima file which contains all the written routines.
Chapter
This chapter introduces first the theory to derive the elemental stiffness matrix of Timoshenko beam elements for an arbitrary number of nodes and assumptions for the displacement and rotation fields. Then, the principal finite element equation of such beam elements and their arrangements as plane frame structures are briefly covered. Furthermore,...
Chapter
This chapter introduces first the theory to derive the elemental stiffness matrix of rod elements. Then, the principal finite element equation of such rod elements and their arrangements as plane truss structures is briefly covered. Based on a comprehensive example, the solution procedure is explained for a ‘hand calculation’ and corresponding comm...
Chapter
This chapter introduces first the theory to derive the elemental stiffness matrix of Euler–Bernoulli beam elements. Then, the principal finite element equation of such beams and their arrangements as plane frame structures are briefly covered. Furthermore, a combination of Euler–Bernoulli beam and rod element is introduced as a generalized beam and...
Chapter
This chapter provides the commented and structured source code of the main Maxima file which contains all the written routines.
Chapter
This chapter briefly introduces to the theory of single rod elements and their arrangements as plane truss structures. Based on a comprehensive example, the solution procedure is explained for a ‘hand calculation’ and corresponding comments on the computer implementation are provided. The chapter concludes with detailed Maxima examples which allow...
Chapter
This chapter briefly introduces to the theory of single Timoshenko beam elements and their arrangements as plane frame structures. Furthermore, a combination of Timoshenko beam and rod element is introduced as a generalized beam and frame element. Comments on the computer implementation of the corresponding Maxima modules are provided. The chapter...
Chapter
This chapter briefly introduces to the theory of single Euler–Bernoulli beam elements and their arrangements as plane frame structures. Furthermore, a combination of Euler–Bernoulli beam and rod element is introduced as a generalized beam and frame element. Comments on the computer implementation of the corresponding Maxima modules are provided. Th...
Chapter
This chapter summarizes a few basic operations of the computer algebra system Maxima, as well as the internet links to download the software. The few topics covered are basic arithmetics, definition of variables and functions. For a comprehensive introduction, the reader is referred to the available literature.
Book
This book provides a study aid on the finite element method. Based on the free computer algebra system “Maxima”, it presents routines to symbolically or numerically solve problems in the context of plane truss and frame structures. This allows readers to not only check classical “hand calculations” but also understand the computer implementation of...
Article
Metallic hollow-sphere structures are a new type of advanced materials with promising mechanical properties for multifunctional applications. A simple computational model to consider damage in the sphere-matrix interphase is presented. Two types of damage distributions, i.e., localized and randomized, are investigated. The procedure is applied to s...
Article
New applications for carbon nanotubes (CNTs) are emerging every day. CNTs are mostly used as the reinforcing phase in polymer composites. Recently, their application in improving the conductivity of these composites has attracted a lot of researchers. Considering helping to have a more realistic view of their reinforcing ability, this paper investi...