The Experts below are selected from a list of 186 Experts worldwide ranked by ideXlab platform
F Z Kebbab - One of the best experts on this subject based on the ideXlab platform.
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effect of Shearing Deformation on the transient response of a traveling wave ultrasonic motor
Sensors and Actuators A-physical, 2009Co-Authors: Z Boumous, S Belkhiat, F Z KebbabAbstract:Some works take into account the Shearing Deformation of frictional material, but its effect on the transient response has not yet been considered. In this paper, optimal Deformation angle and resonance frequency of frictional material are investigated. Force expressions in the stator/rotor interface are developed. Mechanical characteristics taking into account the effect of Shearing Deformation are deduced and presented. It is shown that the Shearing Deformation affects the initial state as well as on the steady state. Also, the fast time response of the motor is deduced. Results of the simulation are validated using the measurements made by other researchers on traveling wave piezoelectric motor AWM90-X, Daimler-Benz type, and a prototype USM(AWM-90).
Z Boumous - One of the best experts on this subject based on the ideXlab platform.
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effect of Shearing Deformation on the transient response of a traveling wave ultrasonic motor
Sensors and Actuators A-physical, 2009Co-Authors: Z Boumous, S Belkhiat, F Z KebbabAbstract:Some works take into account the Shearing Deformation of frictional material, but its effect on the transient response has not yet been considered. In this paper, optimal Deformation angle and resonance frequency of frictional material are investigated. Force expressions in the stator/rotor interface are developed. Mechanical characteristics taking into account the effect of Shearing Deformation are deduced and presented. It is shown that the Shearing Deformation affects the initial state as well as on the steady state. Also, the fast time response of the motor is deduced. Results of the simulation are validated using the measurements made by other researchers on traveling wave piezoelectric motor AWM90-X, Daimler-Benz type, and a prototype USM(AWM-90).
S Belkhiat - One of the best experts on this subject based on the ideXlab platform.
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effect of Shearing Deformation on the transient response of a traveling wave ultrasonic motor
Sensors and Actuators A-physical, 2009Co-Authors: Z Boumous, S Belkhiat, F Z KebbabAbstract:Some works take into account the Shearing Deformation of frictional material, but its effect on the transient response has not yet been considered. In this paper, optimal Deformation angle and resonance frequency of frictional material are investigated. Force expressions in the stator/rotor interface are developed. Mechanical characteristics taking into account the effect of Shearing Deformation are deduced and presented. It is shown that the Shearing Deformation affects the initial state as well as on the steady state. Also, the fast time response of the motor is deduced. Results of the simulation are validated using the measurements made by other researchers on traveling wave piezoelectric motor AWM90-X, Daimler-Benz type, and a prototype USM(AWM-90).
Hamid Arastoopour - One of the best experts on this subject based on the ideXlab platform.
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effect of material non homogeneity on the inhomogeneous Shearing Deformation of a gent slab subjected to a temperature gradient
International Journal of Non-linear Mechanics, 2003Co-Authors: Ecevit Bilgili, Barry Bernstein, Hamid ArastoopourAbstract:Abstract It is well known that most rubber-like materials are non-homogeneous due to either imperfect manufacturing conditions or the action of severe thermo-oxidative environments in many practical applications. In this study, within the context of finite thermoelasticity, we theoretically analyze the inhomogeneous Shearing Deformation of a non-homogeneous rubber-like slab subjected to a thermal gradient across its thickness. The major objective of this study is to investigate the effect of the material non-homogeneity, which is the material-coordinate dependence of the material response functions, on the stress–strain fields for a given temperature gradient. First, we show the existence of a simple Shearing Deformation from which the generalized shear modulus and the generalized thermal conductivity of the slab could be obtained. Based on this information, the Gent material model is generalized to take the material non-homogeneity and the temperature dependence of the stress into account. To analyze the inhomogeneous Shearing Deformation of the non-homogeneous slab, Deformation and temperature fields are postulated; then the decoupled temperature field is obtained analytically by solving the local energy balance equation. Finally, the static equilibrium equations are solved considering the linear temperature field. Our results show that the spatial pattern and the degree of the material non-homogeneity have profound effects on the stress–strain fields. The shear strain becomes nearly homogeneous and the stresses are relatively small for a certain spatial variation of the material non-homogeneity. This result suggests the possibility of designing a novel class of materials: functionally graded rubber-elastic materials (FGREMs).
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inhomogeneous Shearing Deformation of a rubber like slab within the context of finite thermoelasticity with entropic origin for the stress
International Journal of Non-linear Mechanics, 2001Co-Authors: Ecevit Bilgili, Barry Bernstein, Hamid ArastoopourAbstract:This paper deals with inhomogeneous Shearing Deformation of an infinite rubber-like slab under a temperature difference across its thickness. The Deformation is analyzed within the context of finite thermoelasticity with entropic origin for the stress. The isothermal strain energy functions of Mooney and of Yeoh are generalized by incorporating them into the thermoelastic model. The energy balance equation, which is decoupled from the linear momentum balance equations, is solved for the temperature field using the Fourier's law of heat conduction. The derived linear temperature field and the equations of the thermoelastic model are inserted into the linear momentum balance equations, thus yielding an ordinary differential equation for the shear strain. The shear strain, the degree of inhomogeneity in the shear strain, the stress field, and the principal stresses are then determined using a finite difference method. The Mooney slab undergoes markedly greater shear strain near the colder boundary, thus exhibiting a boundary layer-like structure at higher temperature differences across the thickness. However, the Yeoh slab exhibits a relatively smaller variation of the shear strain even at the highest temperature difference. This difference in the behavior of the two slabs is attributed to the shear stiffening of the Yeoh slab, which counteracts the formation of a boundary layer-like structure. Both slabs experience constant shear stresses across the thickness, whereas they experience much greater normal stress differences varying across the thickness. The values of the major principal stress turn out to be close to those of the first normal stress difference. The presence of a large normal stress difference compared with a relatively smaller shear stress in the slabs creates the possibility for Mode I type fracture propagation.
S. Wang - One of the best experts on this subject based on the ideXlab platform.
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asymptotic analysis on flexural dynamic characteristics for a laminated composite plate with embedded and perforated periodically viscoelastic damping material core
Composite Structures, 2016Co-Authors: X. Q. Zhou, D Y Yu, S Q Zhang, Xinyu Shao, S. WangAbstract:Abstract In this paper, the flexural dynamic characteristics of a laminated composite plate (LCP) with fillers and perforated periodically viscoelastic damping material (VDM) core is researched, which is the succession research of refer (Zhou et al. 2015) that could obtain highly effects of vibration energy absorption and dissipation in medium and high frequency, and refer (Zhou et al. 2016), in low frequency. By considering the frequency and temperature properties of VDM, applying the zig-zag theory (ZZT), the equilibrium equations are built by the extended Hamilton’s principle (EHP), and the flexural and Shearing Deformation compatible equations, and then solved the equations by “rapid” second-order asymptotic expansion method (SAEM) according to the geometry characteristic of the constructed structures, and the opening ratio (OR), filling ratio (FR), the density of embedded material and the height of viscoelastic damping layer which affected the flexural dynamic characteristics of the composite structures are researched thoroughly, and the validity of the calculation is verified by finite element method and the advantages of the composite structures are demonstrated meanwhile.
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asymptotic analysis for composite laminated plate with periodically fillers in viscoelastic damping material core
Composites Part B-engineering, 2016Co-Authors: X. Q. Zhou, D Y Yu, S. Wang, Xinyu Shao, S Q ZhangAbstract:Abstract A novel functional structure which can generate large structural loss factor (LF) in low frequency is designed in this research. The free flexural dynamic characteristics of composite laminated plate (CLP) cored with viscoelastic damping material (VDM) are studied by considering its frequency- and temperature-dependent properties. The heavy-density-material-rods (HDMRs) are periodically embedded into CLP. CLP's in-plane variables are obtained by classic laminated plate theory (CLPT) first, and then substituted it into the equilibrium equations which are derived from the Hamilton's principle, the flexural and Shearing Deformation compatible equations according to the mechanism of a primitive cell. The analytical Deformation equation of the CLP is solved by the second order “rapid” asymptotic method, and LF is obtained, subsequently. The parameters that affect the LF are thoroughly analyzed. The validity of the research is verified by FEM. The research show the advantages of the presented CLP which could be applied in engineering under low frequency zone, especially in 1–200 Hz.