# Mehran MoradiIsfahan University of Technology | IUT · Department of Mechanical Engineering

Mehran Moradi

Doctor of Engineering

## About

62

Publications

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258

Citations

## Publications

Publications (62)

A High magnitude of von Mises stress is considered a source of plastic deformation, fatigue crack initiation, and surface defects. A Detailed finite element model (FEM) was proposed here to estimate the thermo-mechanical stress and residual stress components at an industrial hot rolling work roll during the rolling process. Also, a semi-analytical...

Boltzmann entropy equation is gained according to the statistical mechanics directly and general dependence between entropy and probability is obtained. Based on the second law of thermodynamics with a glance at the Boltzmann entropy equation, it can be deduced that physical processes are done in a direction that the probability of the system and t...

In this paper, an arbitrary angle waveguide bend made of a new heterostructure phononic crystal has been studied. By creation of line defects in the proposed heterostructure which is composed of square and rhombus phononic crystals, a simple structure waveguide bend with arbitrary angles is made. Analyzing the proposed bend showed that by creating...

III-conditioning at the inverse equation of integral method in ring-core residual stress measurement leads to high stress sensitivity to strain measurement error. The present paper aims to investigate the use of Chebyshev points and the least square methods to decrease residual stress uncertainties, in particular, near-surface and interior depth, w...

The uncertainty on the values of the measured residual stresses in hole-drilling integral method, the most widely used technique for measuring residual stress, will be called hereinafter as residual stress noises, which initiate high sensitivity of stress to strain measurement errors due to ill-conditioning of inverse integral equations. This study...

In this paper for the first time, an attempt is made to use the scaled boundary finite element method by considering hexagonal elements corresponding to the structure of graphene honeycomb. Equivalent energy criteria were also used in the simulation. The scale was presented in different boundary conditions for monolayer graphene and in different mo...

In this paper, a semi-analytical model was proposed to superimpose the initial residual stress components on the work roll surface and subsurface to minimize the maximum value of Von-Mises Stresses (MVMS) during the hot rolling process to reduce the possibility of roll wear and increase the fatigue life. A Finite Element Model (FEM) was proposed to...

In this paper, we investigate the movement of nanoplates using two approaches: extracting its differential equation, and extracting an integral equation based on the energy conservation principle. To extract the differential equation describing the free vibration of nanoplates in constant in-plane magnetic fields, we first use the theories develope...

The second law of thermodynamics is one of the most important physical laws that has been extracted by different formulations. In this paper, a new approach to study different formulations of the second law is extracted based on the energy components of the system as well as introducing the independent and dependent energy components concepts. Also...

In this paper, we investigate the movement of nanoplates using two approaches: extracting its differential equation, and extracting an integral equation based on the energy conservation principle. To extract the differential equation describing the free vibration of nanoplates in constant in-plane magnetic fields, we first use the theories develope...

The basis of the Energy Structure Theory can be introduced in references [1-5] presented in 2020. Energy Structure Theory explains some new thermo-physical concepts including energy space, energy structure equation, dependent and independent energy components, irreversibility components, irreversibility structure, etc. Since this theory is presente...

ABSRACT--- The basis of the Energy Structure Theory can be introduced in references [1-5] presented in 2020. Energy Structure Theory explains some new thermo-physical concepts including energy space, energy structure equation, dependent and independent energy components, irreversibility components, irreversibility structure, etc. Since this theory...

When a physical process is performed, identifying the generated entropy can be used to investigate the irreversibility. But for this mean, from the perspective of the Boltzmann equation, both all microstates and macrostates must be studied. In fact, it is needed that all particles energy level to be investigated. Therefore, to investigate entropy i...

From the perspective of statistical physics (Boltzmann equation), configurational entropy can be calculated using the study of the microstates of the system. When a physical process is performed, identifying the entropy production can be used to investigate the irreversibility, but from the perspective of the Boltzmann equation, to study entropy pr...

Modeling and investigating of energy distribution especially the wasted one is very important in viscoelastic problems. In this article, an applied energy model based on separation of energy components of the system is extracted and expanded to apply in linear viscoelastic problems, although this method is applicable in nonlinear problems as well....

This paper presents a macroscopic applied innovate modeling to study the performance effects of the second law of thermodynamics on the mechanical systems. To investigate the irreversibility in mechanical systems, the energy structure of the system can be studied. Some energy components relate to the reversible processes and remaining relate to the...

In this paper, using the combination of the first and second laws of thermodynamics, the work bounds in thermodynamic cycles are investigated generally and, to show the application, the results are extracted for some physical systems. Also, a new concept on the available work limits is extracted. To provide information on the maximum or minimum amo...

In this article, for the first time, probabilistic fracture of cracked nano-graphene sheets is investigated using stochastic fracture analysis and scaled boundary finite element method. Probabilities of fracture as well as the first four moments of stresses including average and variances are calculated for all bonds at different crack angles, assu...

In this article, for the first time, probabilistic fracture of cracked nano-graphene sheets is investigated using stochastic fracture analysis and scaled boundary finite element method. Probabilities of fracture as well as the first four moments of stresses including average and variances are calculated for all bonds at different crack angles, assu...

For the first time, making use of scaled boundary finite element method (SBFM), critical intensity factors for the first, second and effective modes of angled cracks in a Nano-graphene sheet were calculated. The results showed that by increasing the crack angle relative to the direction of the applied traction, the critical intensity factors decrea...

In this paper, the penetration of a hemispherical projectile into the targets with three adjacent layers (without air gap) with different arrangement and materials has been studied. To study the set parameters, some ballistic tests as well as FEM simulations had done and the numerical results compared with experimental ones. While defining ballisti...

In this paper, by using scaled boundary finite element method (SBFM), a perfect nanographene sheet or
cracked ones were simulated for the first time. In this analysis, the atomic carbon bonds were modeled by
simple bar elements with circular cross- sections. Despite of molecular dynamics (MD), the results obtained
from SBFM analysis are quite accep...

In this paper, the effects of post weld heat treatment (PWHT) by ceramic pad heater to relieve residual stresses of an A106GRB carbon steel pipe is presented. At first, the pipe was welded in 3 passes by GTAW and SMAW process. The thermal cycle was measured during welding with k-type thermocouple. Hole drilling method has been used for measuring re...

In order to obtain transmission spectra through a phononic crystal as well as its waveguide, a new algorithm is presented in this paper. By extracting displacement-based forms of elastic wave equations and their discretization, Displacement- Based Finite Difference Time Domain (DBFDTD) algorithm is presented. Two numerical examples are solvcd with...

In this paper, the deep drawing process of an automobile panel in order to select the appropriate amount of parameters has been investigated. The parameters include friction between the blank and die, blank width and length, blank thickness and gap between the blank and blank-holder. A multi-layer artificial neural network (ANN) trained by finite e...

In this paper, the effects of post weld heat treatment (PWHT) by ceramic pad heater to relieve residual stresses of an A106GRB carbon steel pipe is presented. At first, the pipe was welded in 3 passes by GTAW and SMAW process. The thermal cycle was measured during welding with k-type thermocouple. Hole drilling method has been used for measuring re...

In this paper, a new heterostructure phononic crystal is introduced. The new heterostructure is composed of square and rhombus phononic crystals. Using finite difference method, a displacement-based algorithm is presented to study elastic wave propagation in the phononic crystal. In contrast with conventional finite difference time domain method, a...

In this article, the free vibration behavior of viscoelastic orthotropic rectangular nanoplates resting on elastic foundation is studied. Using nonlocal elasticity and classical plate theories, the governing equations are derived for graphene oxide nanoplate. Analytical frequency equations for nanoplate with simply supported boundary condition are...

Functionally graded materials (FGMs) are a subgroup of composite materials. Exact bending solution of a thick FGM rectangular plate is investigated by using three-dimensional elasticity theory. The Young's modulus of the plate is assumed to vary exponentially along the thickness direction, while the value of Poisson's ratio is constant. The Lévy so...

In this research, the effect of reprocessing of acrylonitrile–butadiene–styrene (ABS) on the mechanical properties of the polymer was studied through a five-stage reprocessing. To this end, the injection mold of the standard samples was manufactured. Then, using an injection molding machine, all of the virgin material was processed. After sampling,...

Processing material in the semisolid state has the advantage of a low energy requirement in comparison to processing in the solid state. In this study, a simple rod compression test of AL6061 alloy in the semisolid state is experimentally investigated with solid volume fractions of 0.6, 0.7, 0.8, and 0.9 and various ram speeds of 2, 5, and 7 mm/min...

The aim of studying and analysing vibrational characteristics of structures using power flow is to control the noise and vibration within the structure and prevent it from being transmitted into the environment. The power flow within a cylindrical shell is investigated because of its importance in designing spacecraft and marine structures. In this...

In this paper, by using four accelerometers in line on a cylindrical shell, structural wave intensity was measured based on frequency response approach. A FFT analyzer was employed to calculate four-point as well as two-point flexural and shear power flow in order to investigate their effects on the total power flow. The results show that the effec...

Austenitic stainless steels are widely used in high temperature performance. In this paper, first a short discussion with the steels is presented. The behavior has been stirdied under hot working. An experimental test on Type 321 stainless steel machining is done. Experiments using two different tool geometries and cutting parameters are different....

One of the bellows producing methods is hydro forming process. Some factors of hydro forming process such as internal pressure and velocity of die close, can affect final characteristic of produced bellows such as thickness distribution. One of the most important parametersof control in bellows is wall thickness distribution. In this paper, the thi...

In this paper, different features of " deep drawing with ABS (Anti-lock Braking System) " was investigated through finite element simulation and analysis. Different blank holder gap and oscillation amplitude were used in the analysis of deep drawing of a cylindrical cup. A Sine profile was considered for the oscillation of the blank holder. Circula...

The aim of this research is to investigate the effect of basis functions order, on the error norm, in EFG method. For this
purpose, a cantilever elastic beam is considered. To get rid of the singularity, the essential boundary conditions, based
on analytical solution, are applied by using both Lagrange Approach and Penalty Function, separately. In...

A thick-walled cylinder of strain hardening material with closed ends, which is assumed to obey Von-Mises yield criterion is considered. An elastoplastic and residual stress analysis of thick-walled cylinders is performed with the incremental theory of plasticity. Critical pressures of direct and reverse yielding are investigated using the Von-Mise...

An independent kinematic hardening material model in which the reverse yielding point is defined by the Bauschinger effect
factor (BEF), has been defined for stainless steel SUS 304. The material model and the BEF are obtained experimentally and
represented mathematically as continuous functions of effective plastic strain. The material model has b...

A thick- walled cylinder of isotropic, homogeneous, strain hardening material with closed ends, which is assumed obey Von-Mises yield criterion is considered in this study. Loading is also assumed to consist of a temperature gradient as well as an internal pressure. A generalized plane strain case in which the material obeys Von Mises criterion is...

This paper deals with a new boundary element method for analysis of the quasistatic problems in coupled thermoelasticity. Through some mathematical manipulation of the Navier equation in elasticity, the heat conduction equation is transformed into a simpler form, similar to the uncoupled-type equation with the modified thermal conductivity which sh...

Due to the material property requirements for severe performance condition of gas turbine blades could not be fulfilled in conventional forging process, some special care should be taken. In this paper, a forging process with simultaneous heat treatment in two steps is designed to manufacture nickel-based alloy 718 turbine blades from an initial cy...