Acta Mechanica Sinica
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Exact solutions for free vibration of transversely isotropic piezoelectric circular plates
Acta Mechanica Sinica - Tập 16 - Trang 141-147 - 2000
By employing the general solution for coupled three-dimensional equations of a transversely isotropic piezoelectric body, this paper investigates the free vibration of a circular plate made of piezoelectric material. Three-dimensional exact solutions are then obtained under two specified boundary conditions, which can be used for both axisymmetric and non-axisymmetric cases. Numerical results are ......
Time marching integral equation method for unsteady transonic flows
Acta Mechanica Sinica - Tập 6 - Trang 119-127 - 1990
In this paper, we have proposed a time marching intregral equation method which does not have the limitation of the time linearized integral equation method in that the latter method can not satisfactorily simulate the shock-wave motions. Firstly, a model problem—one dimensional initial and boundary value wave problem is treated to clarify the basic idea of the new method. Then the method is imple......
A simple algorithm to improve the performance of the WENO scheme on non-uniform grids
Acta Mechanica Sinica - Tập 34 - Trang 37-47 - 2017
This paper presents a simple approach for improving the performance of the weighted essentially non-oscillatory (WENO) finite volume scheme on non-uniform grids. This technique relies on the reformulation of the fifth-order WENO-JS (WENO scheme presented by Jiang and Shu in J. Comput. Phys. 126:202–228, 1995) scheme designed on uniform grids in terms of one cell-averaged value and its left and/or ......
Elastoplastic homogenization of particulate composites complying with the Mohr–Coulomb criterion and undergoing isotropic loading
Acta Mechanica Sinica - Tập 31 - Trang 392-405 - 2015
This work aims at determining the overall response of a two-phase elastoplastic composite to isotropic loading. The composite under investigation consists of elastic particles embedded in an elastic perfectly plastic matrix governed by the Mohr–Coulomb yield criterion and a non-associated plastic flow rule. The composite sphere assemblage model is adopted, and closed-form estimates are derived for......
Experimental and simulation optimization analysis of the Whipple shields against shaped charge
Acta Mechanica Sinica - Tập 28 - Trang 877-884 - 2012
Occasionally, the Whipple shields are used for the protection of a space station and a satellite against the meteoroids and orbital debris. In the Whipple shields each layer of the shield depletes part of high speed projectile energy either by breaking the projectile or absorbing its energy. Similarly, this investigation uses the Whipple shields against the shaped charge to protect the light armou......
Dissipation-induced instabilities and symmetry
Acta Mechanica Sinica - Tập 27 - Trang 2-6 - 2011
The paradox of destabilization of a conservative or non-conservative system by small dissipation, or Ziegler’s paradox (1952), has stimulated a growing interest in the sensitivity of reversible and Hamiltonian systems with respect to dissipative perturbations. Since the last decade it has been widely accepted that dissipation-induced instabilities are closely related to singularities arising on th......
The effect of discharge conditions of ICP etching reactor on plasma parameters
Acta Mechanica Sinica - Tập 25 - Trang 769-776 - 2009
This study investigated the inductively coupled plasma etching reactor and RF coils developed by North Microelectronic Corporation. Full three dimensional simulations were made at different discharge conditions. The simulations examined and compared the distribution and non-uniformity of several plasma parameters at a fixed position upon the wafer at different pressures and coil currents. These pa......
A thermo-viscoelastic model for particle-reinforced composites based on micromechanical modeling
Acta Mechanica Sinica - Tập 37 - Trang 402-413 - 2021
Micromechanics-based constitutive models offer superior ability to estimate the effective mechanical properties for the composites, which greatly promote the computational efficiency in the multiscale analysis for composite structures. In this work, a thermo-viscoelastic model for particle-reinforced composites is proposed to estimate their thermal–mechanical coupling behaviors in terms of a micro......
Magnetically induced electric potential in first-order composite beams incorporating couple stress and its flexoelectric effects
Acta Mechanica Sinica - Tập 37 - Trang 1509-1519 - 2021
A new model of a first-order composite beam with flexoelectric and piezomagnetic layers is developed. The new model is under a transverse magnetic field and can capture the couple stress and its flexoelectric effects. The governing equations are obtained through a variational approach. To illustrate the new model, the static bending problem is analytically solved based on a Navier’s technique. The......
An exact nonlinear hybrid-coordinate formulation for flexible multibody systems
Acta Mechanica Sinica - Tập 23 - Trang 699-706 - 2007
The previous low-order approximate nonlinear formulations succeeded in capturing the stiffening terms, but failed in simulation of mechanical systems with large deformation due to the neglect of the high-order deformation terms. In this paper, a new hybrid-coordinate formulation is proposed, which is suitable for flexible multibody systems with large deformation. On the basis of exact strain–displ......
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