Aerospace Science and Technology
Numerical Calculation of Fracture Parameters in Grooved Rotating Disc Containing Three-dimensional Semi-elliptical Crack Under Mixed Mode Loading

Seyed mohammad navid Ghoreishi; Bahar Salimi

Articles in Press, Accepted Manuscript, Available Online from 30 September 2023

https://doi.org/10.22034/jast.2023.398765.1151

Abstract
  In this study, a comprehensive investigation of the fracture parameters in a grooved rotating disc containing a three-dimensional semi-elliptical crack under different working conditions has been investigated. In this regard, three models of radial, circumferential and inclined crack with an angle of ...  Read More

Aerospace Science and Technology
Investigation of effective parameters on graphite distribution in FGM structure of A356/Al2O3/Gr composite

Ali Alizadeh; Mohsen Heydari Beni; Jafar Eskandari Jam

Articles in Press, Accepted Manuscript, Available Online from 27 January 2024

https://doi.org/10.22034/jast.2024.430111.1171

Abstract
  In this research, aluminum/alumina/graphite hybrid composite was prepared by horizontal centrifugal casting method, and the microstructure and distribution of alumina and graphite particles in the radial direction of the cross-sectional area of the samples were investigated. The distribution of graphite ...  Read More

Aerospace Science and Technology
Analyzing the effect of helicopter pilot cushion on body vibrations through numerical and analytical investigation

Heshmatollah MohammadKhanlo; Ali Nouri; Seyed Mohammad Kamali

Articles in Press, Accepted Manuscript, Available Online from 06 February 2024

https://doi.org/10.22034/jast.2024.419274.1164

Abstract
  Exposure to vibrations of certain frequencies can pose a risk to the pilot's body. During flight, the maneuvers performed by the pilot expose them to sudden and unfavorable accelerations, which can cause physical, physiological, and psychological problems. Research suggests that the use of seat suspension ...  Read More

Aerospace Science and Technology
Ionospheric electron density reconstruction over central Europe using neural networks: A comparative study

Seyyed Reza Ghaffari-Razin; Reza Davari-Majd; Behzad Voosoghi; Navid Hooshangi

Volume 17, Issue 1 , June 2024, , Pages 23-33

https://doi.org/10.22034/jast.2023.187660.1020

Abstract
  Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density image by computing Total Electron Content (TEC) values from the recorded GPS signals. Due to the poor spatial distribution of GPS stations, limitations of signal viewing angle and discontinuity of observations ...  Read More

Aerospace Science and Technology
On the Effects of Stiffness Ratio in Nonlinear Aeroelastic Stability of a Folding Wing

Sayed Hossein Moravej Barzani; Mahdi Mortazavi; Hossein Shahverdi

Volume 16, Issue 2 , October 2023, , Pages 33-39

https://doi.org/10.22034/jast.2023.396484.1149

Abstract
  In this paper, the effects caused by the combination of folding angles simultaneously with changing the stiffness ratio of different parts of a folding wing are investigated. The geometrically exact fully intrinsic equations are employed to simulated the wing nonlinear dynamic behavior. The important ...  Read More

Aerospace Science and Technology
Buckling Behavior of Functionally Graded Nano Clay-Reinforced Composite Beams

Mahdi Karami Khorramabadi; Ali Reza Nezamabadi

Volume 15, Issue 2 , October 2022, , Pages 110-117

https://doi.org/10.22034/jast.2022.341613.1118

Abstract
  In this paper, the buckling behavior of functionally graded simply supported nanocomposite beams reinforced by nano clay is studied. The specimens were prepared and the experimental tensile and buckling tests are carried out. The elastic modulus of epoxy/clay nanocomposite for functionally graded and ...  Read More

Aerospace Science and Technology
Mixed Mode (I/II/III) Stress Intensity Factors in Gas Turbine Blade Considering 3D Semi-elliptical Crack

Seyed mohammad navid ghoreishi; Nabi Mehri-Khansari; Houman rezaei

Volume 15, Issue 1 , June 2022, , Pages 1-13

https://doi.org/10.22034/jast.2021.294317.1077

Abstract
  Regardless of the initiation or propagation procedure of crack in a gas turbine blade, the precise expectation of the fracture behavior, such as mixed-mode Stress Intensity Factors (SIF), plays a significant role in acquiring its operational life. Therefore, multilateral three-dimensional fracture solutions ...  Read More

Aerospace Science and Technology
Development of real-time aeroelastic flight simulation tool for primary design and stability analysis

Hossein Faveadi; Ali R. Davari; Farshad Pazooki; Majid Pouladian

Volume 15, Issue 1 , June 2022, , Pages 99-115

https://doi.org/10.22034/jast.2022.246477.1036

Abstract
  Flight simulation is a powerful and usefull instrument in design, testing, evaluation and validation of aircrafts; The results of aerolastic simulation along with rigid simulation can be used in the many areas of designs, such as modification or optimization, stability analysis and evaluating field test ...  Read More

Aerospace Science and Technology
Study on effects of different rotational speed functions in elastic-plastic analysis of annular thin disk of functionally graded material

Hadi Hamedani; Ahmad Mamandi

Volume 14, Issue 2 , October 2021, , Pages 30-51

Abstract
  In this paper, the effects of different rotational speed functions in the elastic-plastic deformation and stress analysis of a rotating annular thin disk of functionally graded material (FGM) in Reddy model is studied using the analytical and FEM methods. In this regard, differential equations governing ...  Read More

Aerospace Science and Technology
Nonlinear thermal buckling of functionally graded cylindrical panels via dynamic relaxation technique and incremental loading approach

M.E. Golmakani; M. Moravej; M. Sadeghian

Volume 14, Issue 2 , October 2021, , Pages 66-79

Abstract
  In this paper, the nonlinear thermal buckling of moderately thick functionally graded cylindrical panels is analyzed based on the first-order shear deformation theory (FSDT) and large deflection von Kármán equations. The highly coupled nonlinear governing equations are solved using the ...  Read More

Aerospace Science and Technology
Analysis of Composite Lattice Cylindrical Shells Under Transient Dynamic Loading

Ali Davar; Mahdi Mehrabani; MohammadReza Zamani; Mohsen Heydari Bani; Jafar Eskandari Jam

Volume 14, Issue 1 , June 2021, , Pages 30-44

https://doi.org/10.22034/jast.2021.133431

Abstract
  The composite lattice cylindrical shells are analyzed in this research while they are subjected to transient dynamic loading. The equilibrium equations for the composite cylindrical shell are expressed in terms of classical shell theory. Additionally, due to the discontinuous distribution of stiffness ...  Read More

Aerospace Science and Technology
Semi-analytical solution of a three-dimensional transient response of a functionally graded annular plate with a piezoelectric layer

Pooya Yousefi Khiabani; Ali Nouri; Enayatullah Hosseinian

Volume 14, Issue 1 , June 2021, , Pages 56-72

https://doi.org/10.22034/jast.2021.131307

Abstract
  In this paper, a semi-analytical solution for three-dimensional transient analysis of an annular plate with piezoelectric layers is investigated. The core is a functionally graded material with an exponential distribution. This method, which is a combination of the state space method, Laplace transform ...  Read More

Aerospace Science and Technology
Multi-scale modeling of thermal conductivity of carbon nanotube epoxy nanocomposites- CNT

ali Vahedi; Mohammad Homayoun Sadr; Saied Shakhesi

Volume 13, Issue 2 , October 2020, , Pages 1-6

https://doi.org/10.22034/jast.2021.128047

Abstract
  Epoxy is among the most important polymers, which is extensively employed in various technologies and applications. Nevertheless, epoxy polymers present low thermal conductivities and thus the enhancement of their thermal conductivity is an important research topic. Carbon nanotubes (CNTs) owing to their ...  Read More

Aerospace Science and Technology
Investigating the Effects of Noise and Parameter Changing on Modeling of Jet Transport Aircraft

Sina Jahandari; Ahmad Kalhor; Babak Nadjar Araabi

Volume 13, Issue 2 , October 2020, , Pages 47-52

https://doi.org/10.22034/jast.2021.128049

Abstract
  This paper presents a novel approach to modeling of jet transport aircraft. Initially, basic mathematical models of jet transport are derived. Afterwards by focusing on the bank angle system of the jet transport, considering the aileron as the input, adverse methods of identification are utilized to ...  Read More

Aerospace Science and Technology
Design of Deterministic Self-Tuning Regulators for the Pitch Angle of an Aircraft

Sina Jahandari; Ahmad Kalhor; Babak nadjar Araabi

Volume 13, Issue 2 , October 2020, , Pages 61-65

https://doi.org/10.22034/jast.2021.128031

Abstract
  This paper addresses the adaptive control problem of an aircraft and focuses on the task that the pitch angle of the aircraft is required to follow the desired path. Considering the elevator deflection angle as the input and the pitch angle as the output, a mathematical model of the aircraft is derived ...  Read More

Aerospace Science and Technology
Analytical and Numerical Investigation of Effective Parameters on Energy Absorption Circular Composite Tube under Internal Pressure and Axial

Milad Noorabadi; Rahnama Malihe; Ghasemi Mohammad Amin; Jafar Eskandari Jam

Volume 12, Issue 2 , October 2019, , Pages 1-9

Abstract
  In this paper the energy absorption capacity of stiffened circular composite tube is considered. The governing equations and dynamic equilibrium are first derived and then solved. Additionally, a finite element model of reinforced circular composite tube structure is modeled. At the following, the effects ...  Read More

Aerospace Science and Technology
A Comparison Study on Various Finite Element Models of Riveted Lap Joint by the Use of Dynamic Model Updating

Sajjad hajirezayi; Ali nouri; Enayatollah Hosseinian

Volume 12, Issue 2 , October 2019, , Pages 49-60

Abstract
  Till now, various models have been proposed in literature to simulate the behavior of riveted structures. In order to find the most accurate analytical method in modeling the dynamic behavior of riveted structures, a comparison study is performed on several of these models, in this research. For this ...  Read More

Aerospace Science and Technology
Post-buckling response of thin composite plates under end-shortening strain using Chebyshev techniques

S. Amir M. Ghannadpour; M. Barekati

Volume 12, Issue 1 , March 2019, , Pages 15-26

Abstract
  In this paper, a method based on Chebyshev polynomials is developed for examination of geometrically nonlinear behaviour of thin rectangular composite laminated plates under end-shortening strain. Different boundary conditions and lay-up configurations are investigated and classical laminated plate theory ...  Read More

Aerospace Science and Technology
Multi-objective optimization of buckling load for a laminated composite plate by coupling genetic algorithm and FEM

Mahdi Fakoor; Seyed Mohammad Navid Ghoreishi; Mohamad Aminjafari

Volume 12, Issue 1 , March 2019, , Pages 27-37

Abstract
  In this paper, a combination method has been developed by coupling Multi-Objective Genetic Algorithms (MOGA) and Finite Element Method (FEM). This method has been applied for determination of the optimal stacking sequence of laminated composite plate against buckling. The most important parameters in ...  Read More

Aerospace Science and Technology
Nonlinear Vibration Analysis of Piezoelectric Functionally Graded Porous Timoshenko Beams

Enayatollah Hosseinian; Ali Nouri; Majid Zia

Volume 12, Issue 1 , March 2019, , Pages 53-63

Abstract
  In this paper, nonlinear vibration analysis of functionally graded piezoelectric (FGP) beam with porosities material is investigated based on the Timoshenko beam theory. Material properties of FG porous beam are described according to the rule of mixture which modified to approximate material properties ...  Read More