M. J. Khoshgoftar

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Recent Publications

Three Dimensional Design and Finite Element Analysis of Scaffold for Use in Damaged Bone Tissue

Three Dimensional Design and Finite Element Analysis of Scaffold for Use in Damaged Bone Tissue

Bending analysis of sandwich panel composite with a re-entrant lattice core using zig-zag theory - Scientific Reports

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Sensitivity analysis and study of parameters affecting auxetic cells with reentrant cell structureAuxetic materials and structures are a novel class of materials, which have negative Poisson's ratio. Unlike conventional materials, these materials b…

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Experimental and finite element analysis of the effect of geometrical parameters on the mechanical behavior of auxetic cellular structure under static load | Request PDFRequest PDF | Experimental and finite element analysis of the effect of geometrical parameters on the mechanical behavior of auxetic cellular structure under static load | The auxetic structures are structures with negative Poisson ratio that behave under tension or compression as opposed to ordinary materials. Due... | Find, read and cite all the research you need on ResearchGate

Tailoring vibrational behavior in hybrid cellular sandwich nanobeams: a multiscale computational study

Nonlinear Bending Analysis of a Laminated Composite Plate Using a Refined Zig-Zag Theory - Mechanics of Composite MaterialsA modified zig-zag theory was used to investigate the bending behavior of composite plates and sandwich structures. The theory is based on the first-order shear-deformation theory on some piecewise linear functions for in-plane displacements. This theory does not depend on the shear correction factor and can be applied to various engineering problems associated with the structural dynamics. The nonlinear strain terms in the von Kármán compatibility equation were taken into account to calculate accurate results at large deformation. The governing equations and associated boundary conditions were derived using the principle of virtual work. The calculated numerical results are compared with those of other theories, and an excellent agreement between them was found. The figures and tables presented illustrate the superiority of the model considered in predicting the stress and displacement fields. The model proposed is applicable to nonlinear problems with large deflections.

Tailoring vibrational behavior in hybrid cellular sandwich nanobeams: a multiscale computational study - Archive of Applied MechanicsThis study presents a novel approach to the design of sandwich nanobeams by investigating the vibrational behavior of a three-layer beam comprised of bi-dimensional functionally graded (2D-FG) porous material as the top and bottom face sheets and a hybrid cellular structure (HCS) as the core layer. The HCS is a unique configuration consisting of two separate parts with different unit cell angles, offering a wide range of Poisson ratios from negative to positive. Aluminum and alumina are assumed for face sheets as metal and ceramic, respectively. Also, aluminum is used as the base material for the cellular structure in the middle layer. An elasticity theory based on Eringen’s nonlocal theory is incorporated to account for the effects at small scales. Modified shear deformation theory (PSDBT) is implemented to derive the equations of motion based on the energy method. Afterward, they are solved by the Galerkin method. The possibility of achieving a unit natural frequency of sandwich HCS nanobeam has been conducted. It will be provided by changing the length of parts of the cellular structure core layer with distinct angles. Poisson’s ratios of the core can be adjusted from negative values to positive by altering the angle of cells. Another significant achievement is that sandwich beams with the same natural frequencies can be designed under different shape modes. By analyzing the effect of various parameters, such as material graduation indexes in both directions of thickness and length, the cellular angle of hybrid core, nonlocal parameter, porosity, and slenderness ratios (L/h), the study offers new insights into the design and potential applications of sandwich nanobeams with hybrid cellular structures.

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