Search results for: M. Sadighi

Items from 1 to 20 out of 48 results

article

Dynamic crushing behavior of closed-cell aluminum foams based on different space-filling unit cells

S. Talebi, R. Hedayati, M. Sadighi

Archives of Civil and Mechanical Engineering > 2021 > Vol. 21, no. 3 > 231--245

Closed-cell metal foams are cellular solids that show unique properties such as high strength to weight ratio, high energy absorption capacity, and low thermal conductivity. Due to being computation and cost effective, modeling the behavior of closed-cell foams using regular unit cells has attracted a lot of attention in this regard. Recent developments in additive manufacturing techniques which have...

article

Numerical and experimental analysis of the closed-cell aluminium foam under low velocity impact using computerized tomography technique

S. Talebi, M. Sadighi, M. M. Aghdam

Acta Mechanica Sinica > 2019 > 35 > 1 > 144-155

In the present work, the response of closed-cell aluminum foams under low-velocity impact has been studied numerically and experimentally. Computerized tomography is employed to access three-dimensional (3D) microstructure of the closed-cell aluminum foam. Effective parameters including foam density and the velocity of impactor on foam dynamic behavior are investigated. In order to show the validity...

article

Low-velocity impact behaviour of open-cell foams

R. Hedayati, M. Sadighi

Journal of Theoretical and Applied Mechanics > 2018 > Vol. 56 nr 4 > 939--949

Metal foams are cellular solids that show some unique properties which cannot be found in other natural or human-made materials. While the impact characteristics of closed-cell foams under static and impact loadings appear to be well-studied in the literature, the impact behaviour of open-cell foams is not yet well-understood. In this study, open-cell foams with two different densities are impacted...

article

Free vibration analysis of thick viscoelastic composite plates on visco-Pasternak foundation using higher-order theory

H.A. Zamani, M.M. Aghdam, M. Sadighi

Composite Structures > 2017 > 182 > C > 25-35

Free vibration of laminated viscoelastic composite plates on Pasternak viscoelastic medium with simply supported edge conditions is investigated. The composite plate consists of linear viscoelastic polymeric matrix reinforced by transversely isotropic elastic fibers. Multi-cell micromechanical approach together with relaxation functions of bulk/shear moduli and Boltzmann superposition principle are...

article

An experimental study on the low velocity impact resistance of fibre metal laminates under successive impacts with reduced energies

M. Sadighi, M. Yarmohammad Tooski, R.C. Alderliesten

Aerospace Science and Technology > 2017 > 67 > C > 54-61

The response of Glare 3 and Glare 5 to repeated impacts and dropped tools was experimentally investigated using drop weight equipment. Two repetition sequences were tested. The first sequence consisted of successive impacts with the same impact energy, but lower than the first impact. In the second sequence the rebound energy of one impact was taken as the impact energy for the subsequent impact....

article

Analytical relationships for the mechanical properties of additively manufactured porous biomaterials based on octahedral unit cells

R. Hedayati, M. Sadighi, M. Mohammadi-Aghdam, A.A. Zadpoor

Applied Mathematical Modelling > 2017 > 46 > Complete > 408-422

Additively manufacturing (AM) techniques make it possible to fabricate open-cell interconnected structures with precisely controllable micro-architectures. It has been shown that the morphology, pore size, and relative density of a porous structure determine its macro-scale homogenized mechanical properties and, thus, its biological performance as a biomaterial. In this study, we used analytical,...

article

Mechanical behavior of unidirectional SiC/Ti composites subjected to off-axis loading at elevated temperatures

M.M. Aghdam, S.R. Morsali, S.M.A. Hosseini, M. Sadighi

Materials Science and Engineering: A > 2017 > 688 > C > 244-249

A micromechanical approach is used to study the damage initiation and nonlinear behavior of SiC/Ti composites subjected to a general complicated off-axis loading at elevated service temperatures. The effects of stress relaxation, interface damage together with fiber coating are considered. A cohesive zone model is applied to define the imperfect interface between the fiber and matrix. Introducing...

article

The influence of graphene reinforced electrospun nano-interlayers on quasi-static indentation behavior of fiber-reinforced epoxy composites

M. Goodarz, S. H. Bahrami, M. Sadighi, S. Saber-Samandari

Fibers and Polymers > 2017 > 18 > 2 > 322-333

The aim of this research is to investigate the development and evaluation of hybrid multi-scale aramid/epoxy composites interleaved with electrospun graphene nanoplatelets/nylon 66 (GNPs/PA66) mats. The reinforced nanofiber mats were explored for their best mechanical properties and PA66 nanofibers with 1 wt% GNPs were selected for composite production. Quasi-static indentation tests were performed...

article

How does tissue regeneration influence the mechanical behavior of additively manufactured porous biomaterials?

R. Hedayati, S. Janbaz, M. Sadighi, M. Mohammadi-Aghdam, more

Journal of the Mechanical Behavior of Biomedical Materials > 2017 > 65 > C > 831-841

Although the initial mechanical properties of additively manufactured porous biomaterials are intensively studied during the last few years, almost no information is available regarding the evolution of the mechanical properties of implant-bone complex as the tissue regeneration progresses. In this paper, we studied the effects of tissue regeneration on the static and fatigue behavior of selective...

article

Mechanical properties of additively manufactured octagonal honeycombs

R. Hedayati, M. Sadighi, M. Mohammadi-Aghdam, A.A. Zadpoor

Materials Science and Engineering: C > 2016 > 69 > C > 1307-1317

Honeycomb structures have found numerous applications as structural and biomedical materials due to their favourable properties such as low weight, high stiffness, and porosity. Application of additive manufacturing and 3D printing techniques allows for manufacturing of honeycombs with arbitrary shape and wall thickness, opening the way for optimizing the mechanical and physical properties for specific...

article

A new nonlinear model for studying a sandwich panel with thin composite faces and elastic–plastic core

M. Rezaeifard, S. Jedari Salami, M. Botshekanan Dehkordi, M. Sadighi

Thin-Walled Structures > 2016 > 107 > C > 119-137

In this paper elastic–plastic behavior of a sandwich beam with a transversely flexible core and thin faces is investigated. The elastic–plastic behavior of the core is described by a bilinear constitutive relation of the shear stress. The governing equations for linear and nonlinear regions are derived using higher order sandwich panel theory. The governing equations are solved by finite element method...

article

A micromechanical approach to numerical modeling of yielding of open-cell porous structures under compressive loads

R. Hedayati, M. Sadighi

Journal of Theoretical and Applied Mechanics > 2016 > Vol. 54 nr 3 > 769--781

Today, interconnected open-cell porous structures made of titanium and its alloys are replacing the prevalent solid metals used in bone substitute implants. The advent of additive manufacturing techniques has enabled manufacturing of open-cell structures with arbitrary micro-structural geometry. In this paper, rhombic dodecahedron structures manufactured using SLM technique and tested by Amin Yavari...

article

An advanced high-order theory for bending analysis of moderately thick faced sandwich beams

S. Jedari Salami, S. Dariushi, M. Sadighi, M. Shakeri

European Journal of Mechanics / A Solids > 2016 > 56 > Complete > 1-11

An advanced high order sandwich panel theory (AHSAPT) for bending analysis of moderately thick faced sandwich beams with soft core is introduced. In this new theory, stress compatibility conditions at the interface are satisfied. The transverse shear stresses and the transverse normal stresses vanish on the top and bottom surfaces. Considering mentioned concepts improves high order sandwich panel...

article

Computational prediction of the fatigue behavior of additively manufactured porous metallic biomaterials

R. Hedayati, H. Hosseini-Toudeshky, M. Sadighi, M. Mohammadi-Aghdam, more

International Journal of Fatigue > 2016 > 84 > Complete > 67-79

The mechanical behavior of additively manufactured porous biomaterials has recently received increasing attention. While there is a relatively large body of data available on the static mechanical properties of such biomaterials, their fatigue behavior is not yet well-understood. That is partly because systematic study of the fatigue behavior of these porous biomaterials is time-consuming and expensive...

article

Mechanical properties of regular porous biomaterials made from truncated cube repeating unit cells: Analytical solutions and computational models

R. Hedayati, M. Sadighi, M. Mohammadi-Aghdam, A.A. Zadpoor

Materials Science and Engineering: C > 2016 > 60 > C > 163-183

Additive manufacturing (AM) has enabled fabrication of open-cell porous biomaterials based on repeating unit cells. The micro-architecture of the porous biomaterials and, thus, their physical properties could then be precisely controlled. Due to their many favorable properties, porous biomaterials manufactured using AM are considered as promising candidates for bone substitution as well as for several...

article

Mechanical behavior of additively manufactured porous biomaterials made from truncated cuboctahedron unit cells

R. Hedayati, M. Sadighi, M. Mohammadi-Aghdam, A.A. Zadpoor

International Journal of Mechanical Sciences > 2016 > 106 > C > 19-38

Fueled by continuous improvements in the additive manufacturing and 3D printing technologies, additively manufactured porous biomaterials have been receiving increasing attention during the last few years particularly for application in orthopedics. The mechanical properties of porous biomaterials are of paramount importance for any such application, as both osseointegration and implant performance...

article

Buckling optimisation of sandwich cylindrical panels

M. Abouhamzeh, M. Sadighi

Curved and Layered Structures > 2016 > 3 > 1

In this paper, the buckling load optimisation is performed on sandwich cylindrical panels. A finite element program is developed in MATLAB to solve the governing differential equations of the global buckling of the structure. In order to find the optimal solution, the genetic algorithm Toolbox in MATLAB is implemented. Verifications are made for both the buckling finite element code and also the results...

article

Effect of mass multiple counting on the elastic properties of open-cell regular porous biomaterials

R. Hedayati, M. Sadighi, M. Mohammadi-Aghdam, A.A. Zadpoor

Materials & Design > 2016 > 89 > C > 9-20

Low-density open-cell porous structures are widely researched due to their mechanical properties that are close to natural bone and their open-cell interconnected structure that allows for ingrowth of new bone tissue. Different studies have shown that apparent density dominates the mechanical properties of porous lattice structures. Surveying the literature revealed that in the previously published...

article

Mechanics of additively manufactured porous biomaterials based on the rhombicuboctahedron unit cell

R. Hedayati, M. Sadighi, M. Mohammadi-Aghdam, A.A. Zadpoor

Journal of the Mechanical Behavior of Biomedical Materials > 2016 > 53 > C > 272-294

Thanks to recent developments in additive manufacturing techniques, it is now possible to fabricate porous biomaterials with arbitrarily complex micro-architectures. Micro-architectures of such biomaterials determine their physical and biological properties, meaning that one could potentially improve the performance of such biomaterials through rational design of micro-architecture. The relationship...

article

Numerical and experimental study of the mechanical response of aluminum foams under compressive loading using CT data

A. A. Mohammadi Nasrabadi, R. Hedayati, M. Sadighi

Journal of Theoretical and Applied Mechanics > 2016 > Vol. 54 nr 4 > 1357--1368

Metal foams are relatively novel materials that due to excellent mechanical, thermal, and insulation properties have found wide usage in different engineering applications such as energy absorbers, bone substitute implants, sandwich structure cores, etc. In common numerical studies, the mechanical properties of foams are usually introduced to FE models by considering homogenized uniform properties...

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Search results for: M. Sadighi

Dynamic crushing behavior of closed-cell aluminum foams based on different space-filling unit cells

Numerical and experimental analysis of the closed-cell aluminium foam under low velocity impact using computerized tomography technique

Low-velocity impact behaviour of open-cell foams

Free vibration analysis of thick viscoelastic composite plates on visco-Pasternak foundation using higher-order theory

An experimental study on the low velocity impact resistance of fibre metal laminates under successive impacts with reduced energies

Analytical relationships for the mechanical properties of additively manufactured porous biomaterials based on octahedral unit cells

Mechanical behavior of unidirectional SiC/Ti composites subjected to off-axis loading at elevated temperatures

The influence of graphene reinforced electrospun nano-interlayers on quasi-static indentation behavior of fiber-reinforced epoxy composites

How does tissue regeneration influence the mechanical behavior of additively manufactured porous biomaterials?

Mechanical properties of additively manufactured octagonal honeycombs

A new nonlinear model for studying a sandwich panel with thin composite faces and elastic–plastic core

A micromechanical approach to numerical modeling of yielding of open-cell porous structures under compressive loads

An advanced high-order theory for bending analysis of moderately thick faced sandwich beams

Computational prediction of the fatigue behavior of additively manufactured porous metallic biomaterials

Mechanical properties of regular porous biomaterials made from truncated cube repeating unit cells: Analytical solutions and computational models

Mechanical behavior of additively manufactured porous biomaterials made from truncated cuboctahedron unit cells

Buckling optimisation of sandwich cylindrical panels

Effect of mass multiple counting on the elastic properties of open-cell regular porous biomaterials

Mechanics of additively manufactured porous biomaterials based on the rhombicuboctahedron unit cell

Numerical and experimental study of the mechanical response of aluminum foams under compressive loading using CT data

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