2017-10-24T13:05:16Z
http://jacm.scu.ac.ir/?_action=export&rf=summon&issue=1480
Journal of Applied and Computational Mechanics
JACM
2016
2
3
Free Vibration of Annular Plates by Discrete Singular Convolution and Differential Quadrature Methods
Kadir
Mercan
Hakan
Ersoy
Omer
Civalek
Plates and shells are the significant structural components for many engineering and industrial applications. In this study, free vibration analysis of annular plates is investigated. For this, two different numerical methods such as differential quadrature and discrete singular convolution methods have been performed for numerical simulations. Frequency values have been obtained via these two methods. The performances of these two methods have been investigated.
Differential quadrature
discrete singular convolution
annular plate
free vibration
2016
08
01
128
133
http://jacm.scu.ac.ir/article_12364_66aa8eebb2e74725516ac9cea5679e78.pdf
Journal of Applied and Computational Mechanics
JACM
2016
2
3
Springbackward Phenomenon of a Transversely Isotropic Functionally Graded Composite Cylindrical Shell
V. R.
Manthena
N. K.
Lamba
G. D.
Kedar
This article gives an approach to predict the springbackward phenomena during post solidification cooling in a functionally graded hybrid composite cylindrical shell with transverse isotropic structure. Here the material properties are considered to be given with a general parabolic power-law function. During theoretical analysis, appropriate transform is introduced in the equilibrium equation which is resulting into hyper geometrical differential equation. Thermoelastic solutions are obtained and are investigated for homogeneous, nonhomogenous and elastic-plastic state. The solution is validated by applying it to a multilayered functionally graded cylindrical shell using transfer or propagator matrix method.
Thermoelasticity
Functionally Graded Hybrid Composites
Cylindrical shell
Spring Backward Effect
2016
08
01
134
143
http://jacm.scu.ac.ir/article_12453_14066a3efc617f6d41d988e9edfc84df.pdf
Journal of Applied and Computational Mechanics
JACM
2016
2
3
Conjugate and directional chaos control methods for reliability analysis of CNT–reinforced nanocomposite beams under buckling forces; a comparative study
Behrooz
Keshtegar
Zeng
meng
The efficiency and robustness of reliability methods are two important factors in first order reliability method (FORM). The conjugate choice control (CCC) and directional chaos control method (DCC) were developed to improve the robustness and efficiency of FORM formula using the stability transformation method. In this paper, the CCC and DCC methods are applied for reliability analysis of a complex engineering problem as a nanocomposite beam, which is reinforced by carbon nanotubes (CNTs) under buckling force. The probabilistic model for nanocomposite beam is developed using buckling failure mode which is computed using the Euler-Bernoulli beam model. The robustness and efficiency CCC and DCC are compared using stable solution and number of call limit state functions. The results demonstrate that the CCC method is more robust than DCC for this example, while the DCC method is simpler than the CCC.
Reliability analysis
Nanocomposite beam
Conjugate chaos control
Directional chaos control
2016
08
01
144
151
http://jacm.scu.ac.ir/article_12516_273f07c467d5255dde2bd72a94f4799f.pdf
Journal of Applied and Computational Mechanics
JACM
2016
2
3
Generalized Warping In Flexural-Torsional Buckling Analysis of Composite Beams
Amalia
Argyridi
Evangelos
Sapountzakis
The finite element method is employed for the ﬂexural-torsional linear buckling analysis of beams of arbitrarily shaped composite cross-section taking into account generalized warping (shear lag effects due to both ﬂexure and torsion). The contacting materials, that constitute the composite cross section, may include a finite number of holes. A compressive axial load is applied to the beam. The influence of nonuniform warping is considered by the usage of one independent warping parameter for each warping type, i.e. shear warping in each direction and primary as well as secondary torsional warping, multiplied by the respective warping function. The calculation of the four aforementioned warping functions is implemented by the solution of a corresponding boundary value problem (longitudinal local equilibrium equation). The resulting stress field is corrected through a shear stress correction. The equations are formulated with reference to the independent warping parameters additionally to the displacement and rotation components.
Nonuniform warping
Shear lag
Shear deformation
Composite beams
Flexural-torsional buckling
2016
08
01
152
173
http://jacm.scu.ac.ir/article_12525_cfcd6a2d7bf38582043a42498f071397.pdf
Journal of Applied and Computational Mechanics
JACM
2016
2
3
Deformation Characteristics of Composite Structures
Theddeus T.
AKANO
Omotayo. A
FAKINLEDE
Patrick
Olayiwola
Composites provide design flexibility because many of them can be moulded into complex shapes. Carbon fibre-reinforced epoxy composites exhibit excellent fatigue tolerance with high specific strength and stiffness. These properties led to their numerous advanced applications ranging from military and civil aircraft structures to consumer products. The modelling of beams undergoing arbitrarily large displacements and rotations, but small strains, is a common problem in the application of these engineering composite systems. This paper presents a nonlinear finite element model able to estimate the deformations of the fibre-reinforced epoxy composite beam. The governing equations are based on Euler-Bernoulli Beam Theory (EBBT) with a von Kármán type of kinematic nonlinearity. Anisotropic elasticity is employed for the material model of the composite material. Characterization of the mechanical properties of the composite material is achieved through tensile test while simple laboratory experiment is used to validate the model. Results reveal that composite fibre orientation; the type of applied load and boundary condition affect the deformation characteristics of composite structures. Nonlinear consideration is important in the analysis of fibre-reinforced epoxy composites.
Anisotropic elasticity
composite material
large displacement
2016
08
01
174
191
http://jacm.scu.ac.ir/article_12515_012626b5b1aa42624b3e4979ade796c5.pdf
Journal of Applied and Computational Mechanics
JACM
2016
2
3
Modified Rectangular Patch Antenna Loaded With Multiple C Slots for Multiple Applications
Amit
Jain
Monika
Surana
A new multiple C- slotted microstrip patch antenna is proposed. A patch antenna is a wide-beam narrowband antenna. Microstrip patch antenna consist of a very thin metallic strip (patch) placed a small fraction of a wavelength above a ground plane. The patch can be designed in any possible shape and normally made by conducting material copper or gold. This paper presents design of a C- Slotted microstrip patch antenna for multiple applications. The proposed antenna has low cost, easy fabrication and good isolation. The antenna has Quad different frequency bands, centered at 1.60 GHz, 2.50 GHz, 4.70 GHz and 5.50 GHz for parameter S11. The antenna is designed, simulated and optimized for Quad band performance using IE3D software. With C - slotted shapes patch antenna is designed on a FR4 substrate of thickness 1.59 mm and relative permittivity of 4.4. The proposed patch dimension is 16*16 mm and it utilizes microstrip line feed. By the simulated results parameter S11 and S12, shows that the antenna can cover the bands of several applications including GPS (1.2-1.6 GHz), GSM (1.8-1.9 GHz), WiMAX (2.3-5.8 GHz). Simulation results are presented in terms of Resonant Frequency, Return Loss, Voltage Standing Wave Ratio (VSWR) and Radiation Pattern.
Microstrip antenna
Slotted patch
GPS
GSM
WiMAX
2016
08
01
192
199
http://jacm.scu.ac.ir/article_12526_05757c3e6ba8ad3459696bbf7348aece.pdf