Searched for: author%3A%22Hedayati%2C+R.%22
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Talebi, S. (author), Hedayati, R. (author), Sadighi, M. (author), Ashoori, A. R. (author)
The aim of present work is to address nonlinear dynamic thermal buckling of shallow spherical functionally graded porous shells subjected to transient thermal loading using the first order shear deformation theory (FSDT). A power-law distribution as well as cosine-type porosity distribution are used to model the variation of constituents...
journal article 2022
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Shakibanezhad, R. (author), Sadighi, M. (author), Hedayati, R. (author)
Study of porous materials, in particular closed-cell foams, has always attracted researchers’ interest due to the advantages these materials offer in applications where low weight, buoyancy, insulation, or energy absorption is of importance. In this study, quasi-static compressive experimental tests are conducted for low-, medium-, and high...
journal article 2022
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Wu, Bin (author), Hedayati, R. (author), Li, Zhehua (author), Aghajanpour, Mahsa (author), Zhang, Guichang (author), Zhang, Junhong (author), Lin, Jiewei (author)
Bird strikes are one major accident for aircraft engines and can inflict heavy casualties and economic losses. In this study, a smoothed particle hydrodynamics (SPH) mallard model has been used to simulate bird impact to rotary aero-engine fan blades. The simulations were performed using the finite element method (FEM) at LS-DYNA. The...
journal article 2022
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Sheikhnejad, Yahya (author), Hedayati, R. (author), Nassab, Seyed Abdolreza Gandjalikhan (author)
This special issue aimed to contribute to the novelties and frontiers in porous media with a special focus on analytical models and their comparison with numerical and experimental approaches. The published papers included within this special issue help engineers and programmers to keep the models of real apparatus as simple and accurate as...
review 2022
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Sheikhnejad, Yahya (author), Hedayati, R. (author), Nassab, Seyed Abdolreza Gandjalikhan (author)
This special issue presents up-to-date studies on porous media with a special focus on analytical models and their capability in reconstructing numerical and experimental results. The published papers included within this special issue provide analytical and semi-analytical models for a wide range of problems including micro-polar liquid flow...
review 2022
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Hedayati, R. (author), Sheikhnejad, Yahya (author), Aghdam, Mohammad Mohammadi (author)
contribution to periodical 2022
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Hedayati, R. (author), Bodaghi, Mahdi (author)
Acoustic metamaterials are synthetic materials, made of repeating unit cells that are designed to address an acoustic problem, through the rational design of their micro-feature
contribution to periodical 2022
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Roudbarian, Nima (author), Jebellat, Ehsan (author), Famouri, Seyedfarzad (author), Baniasadi, Mahdi (author), Hedayati, R. (author), Baghani, Mostafa (author)
Triply periodic minimal surfaces (TPMS) metamaterials and shape-memory polymer (SMP) smart materials are known for their beneficial attributes in novel scientific and industrial fields. Through TPMS designs, low weight accompanied by high surface area are achievable, which are known as crucial parameters in many fields, such as tissue...
journal article 2022
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Hedayati, R. (author), Yousefi, Armin (author), Bodaghi, Mahdi (author)
With dramatic increase in 3D printing applications in industry, sandwich panels with 3D printed cores have gained a lot of attention recently. In harmony with global movement towards sustainability and low-carbon emission industries, sandwich panels with easy-to-repair and cost-effective cores would be very attractive structures. In this...
journal article 2022
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Wu, Bin (author), Lin, Jiewei (author), Hedayati, R. (author), Zhang, Guichang (author), Zhang, Junhong (author), Zhang, Lipeng (author)
To study the effect of a bird striking engine fan on the rotor system, a low-pressure rotor system dynamic model based on a real aero-engine structure was established. Dynamic equations were derived considering the case of the bird strike force which transferred to the rotor system. The bird strike force was obtained from the bird strike...
journal article 2021
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Ghavidelnia, Naeim (author), Bodaghi, Mahdi (author), Hedayati, R. (author)
Stress shielding and micromotions are the most significant problems occurring at the bone-implants interface due to a mismatch of their mechanical properties. Mechanical 3D metamate-rials, with their exceptional behaviour and characteristics, can provide an opportunity to solve the mismatch of mechanical properties between the bone and...
journal article 2021
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Hedayati, R. (author), Ghavidelnia, Naeim (author), Sadighi, Mojtaba (author), Bodaghi, Mahdi (author)
Permeable porous implants must satisfy several physical and biological requirements in order to be promising materials for orthopaedic application: they should have the proper levels of stiffness, permeability, and fatigue resistance approximately matching the corresponding levels in bone tissues. This can be achieved using designer materials...
journal article 2021
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Jarrah, Hamid Reza (author), Zolfagharian, Ali (author), Hedayati, R. (author), Serjouei, Ahmad (author), Bodaghi, Mahdi (author)
This paper presents nonlinear finite element (FE) models to predict time-and tempera-ture-dependent responses of shape memory polymer (SMP) foams in the large deformation regime. For the first time, an A SMP foam constitutive model is implemented in the ABAQUS FE package with the aid of a VUMAT subroutine to predict thermo-visco-plastic...
journal article 2021
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Yousefi, Armin (author), Jolaiy, Saman (author), Hedayati, R. (author), Serjouei, Ahmad (author), Bodaghi, Mahdi (author)
Bonded patches are widely used in several industry sectors for repairing damaged plates, cracks in metallic structures, and reinforcement of damaged structures. Composite patches have optimal properties such as high strength‐to‐weight ratio, easiness in being applied, and high flexibility. Due to recent rapid growth in the aerospace industry,...
journal article 2021
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Ghavidelnia, Naeim (author), Bodaghi, Mahdi (author), Hedayati, R. (author)
Mechanical metamaterials are man-made rationally-designed structures that present un-precedented mechanical properties not found in nature. One of the most well-known mechanical metamaterials is auxetics, which demonstrates negative Poisson’s ratio (NPR) behavior that is very beneficial in several industrial applications. In this study, a...
journal article 2021
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Yousefi, Armin (author), Serjouei, Ahmad (author), Hedayati, R. (author), Bodaghi, Mahdi (author)
In the present study, the fatigue behavior and tensile strength of A6061-T4 aluminum al-loy, joined by friction stir spot welding (FSSW), are numerically investigated. The 3D finite element model (FEM) is used to analyze the FSSW joint by means of Abaqus software. The tensile strength is determined for FSSW joints with both a probe hole and a...
journal article 2021
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Hedayati, R. (author), Güven, Aysun (author), van der Zwaag, S. (author)
Materials with a negative Poisson's ratio, also known as auxetics, have attracted a lot attention as they have shown innovation potential in applications for energy damping, modern fasteners, biomedical implants, piezoelectric sensors, and soft actuators. In this study, we introduce different patterns of graded distribution of unit cells with...
journal article 2021
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Talebi, S. (author), Hedayati, R. (author), Sadighi, M. (author)
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journal article 2021
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Mohammadi, Kaivan (author), Movahhedy, Mohammad R. (author), Shishkovsky, Igor (author), Hedayati, R. (author)
Pentamode metamaterials are a type of extremal designer metamaterials, which are able to demonstrate extremely high rigidity in one direction and extremely high compliance in other directions. Pentamodes can, therefore, be considered as building blocks of exotic materials with any arbitrarily selected thermodynamically admissible elasticity...
journal article 2020
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Zhang, Junhong (author), Liu, Zhiyuan (author), Dai, Huwei (author), Hedayati, R. (author), Yuan, Y. (author), Zhang, Guichang (author)
Bird impact on fan blades poses a serious threat to the operational safety of aircraft engines.In this study, a real bird model of mallard duck was developed using the smooth particle hydrodynamics method based on a CT scan of a mallard duck.The accuracy of the real bird model was verified by comparing the simulation results of the impact on...
journal article 2020
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