One of the most important topics in designing procedure of FG structures is dynamic analysis and tracking of elastic waves. In the recent years, some researches have been carried out in wave propagation and dynamic analysis fields for structures made of FGMs. The stress wave propagation [1], analysis of one dimensional wave propagation [2], designing of FGMs based on management of stress waves [3] and dynamic analysis of FG structures under impulsive loading [4] can be listed as some of previous works. The dispersion behavior of waves in a functionally graded elastic plate was studied using laminate plate theory by Chen et al. [5]. Also, Hosseini et al. [6] studied dynamic response and radial wave propagation velocity in thick hollow cylinder made of FGMs. They are solved the Navier equation using a hybrid numerical method based on composition of Galerkin finite element and Newmark finite difference methods. They obtained scattering relations by considering the continuity conditions at the interfaces between any two layers and the boundary conditions at the inner and outer surfaces of FG cylinder. The vibration and dynamic buckling control of imperfect hybrid FGM plates was studied by Shariyat [7]. He investigated vibration and dynamic buckling of FGM rectangular plates with surface-bonded or embedded piezoelectric sensors and actuators subjected to thermo-electro-mechanical loadings. The vibration and stability behavior of freely supported FGM conical shells subjected to external pressure were studied in details by Sofiyev [8].
Also, there are some analytical methods to simulate the elastic wave propagation in FG structures that one of them was presented by Hosseini and Abolbashari [9]. In their paper, an analytical method propos...
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... patterns of microstructures and also mechanical properties can be designed with two direction variations. This kind of FGMs is called
This paper deals with the dynamic analysis of functionally graded thick cylindrical panels with mechanical properties of 2D-FG panel are simulated by using a nonlinear power function with two dimensional volume fractions. The elastic wave fronts are tracked in two dimensional (r-θ) domains for various kinds of grading patterns. Also, the time history of displacement and propagation of displacement waves are discussed in details for various values of exponents in
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MLPG method is a very effective method with high accuracy for two dimensional wave propagation analyses in FGMs with one or two dimensional grading patterns.
Today, engineers rely on damping systems to counteract nature's forces. There are many types of damping systems that engineers can now use for structures, automobiles, and even tennis rackets! This site focuses on damping systems in structures, mainly architectural variations of the tuned mass damper.
Parts, when in service and while forming, are subjected to forces. It is necessary to know the characteristics of the material to design and form the component so that any resulting deformation will not result in failure of the component in service and while forming.
Soa T. “Numerical simulations of a sea ice beam in four-point bending” Master’s Thesis, Aalto University, Finland, 2011.
"The Physics of the Acoustic Guitar - Body." The Physics of the Acoustic Guitar - Body. N.p., n.d. Web. 26 May 2014. .
Saitoh M. On the performance of lumped parameter models with gyro-mass elements for the impedance function of a pile-group supporting a single-degree-of-freedom system. Earthq Eng Struct Dyn. 2012;41(4):623–41.
EBG based antenna is also examined under bent as well as crumpling condition. Performance of EBG based antenna and simple CPW antenna is done. Bending and crumpling effect in EBG based antenna is lesser than simple CPW antenna [5].
In the present work, the finite element method was used to study the elastic-plastic indentation in layered materials. Finite element analysis (FEA) software package ABAQUS version 6.14 was used in the indentation simulation which is a commercial product. One of the major topics within Finite Element Analysis (FEA) is how to present results and verify whether the results accurately illustrate the loading condition. Inaccuracies within the FEA results can stem from various sources including modeling, input of material properties, mesh density, unrealistic stress concentrations, loading conditions, environment, etc.
The core of the program HFSS is based on the finite element method (FEM) (its practical application often known as finite element analysis (FEA)) where it is a numerical technique for finding approximate solutions to partial differential equations (PDE) and their systems, as well as (less often) integral equations.
The results all show how metallic materials have elastic and plastic properties which can be observed on the stress vs strain curve. The Results also indicate that denser metal such as steel have greater strength than the lighter materials such as brass. The energy of rupture is in pascals which is also J/m3.
Tillery, B. (2012). Wave Motions and Sound. Physical science (9th ed., pp. 115-134). New York,
One of the major concerns in the design of marine infrastructures is the navigation safety adjacent to the breakwaters. In many cases, it is important to keep the amount of wave reflection in front of the breakwater to the minimal. The majority of the abovementioned breakwaters mainly serve as wave reflectors. It is hoped that the free surface semicircular breakwater considered for the present research would yield better performance characteristics by producing low reflection and desirable wave attenuation.
The bending stress due to the torsion moment Mx is uniformly distributed along the circumferential direction and maximum at the outer surface of the pipe. The
The channel section (both C and I) have higher bending stiffness as compared to solid square bar with equal cross section area. Considering the bending stiffness of solid square section as 1, the relative bending stiffness of other sections are:
Objects in equilibrium state are defined as isolated objects with precise constant properties such as pressure, temperature and volume. In addition to that the total net force a nd acceleration must be equal to zero (1). Achieving equilibrium state requires knowledge in all object’s properties and behavior. The following research paper will carry the outcomes of our research in the topic, starting with a simple description of the types of the equilibrium state, followed by engineering and mathematical explanations to the topic. After that it will show examples from mechanical engineering classwork and world applications of the topic. The paper will close with the problems faced while completing the research.
Experimental Mechanics involves the experimental investigations of the static and dynamic response of structures and machines, and in the development of improved techniques to obtain and analyze experimental data.