Acta Mechanica Sinica
The Journal covers all disciplines in the field of theoretical and applied mechanics, including solid mechanics, fluid mechanics, dynamics and control, and biomechanics. It explores analytical, computational and experimental progresses in all areas of mechanics. The Journal also encourages research in interdisciplinary subjects, and servess...
CN 11-2063/O3
ISSN 0567-7718(Print)
ISSN 1614-3116(Online)
Editors-in-Chief:
Professor Tian Jian Lu
Professor Wei Shyy
Professor Zhigang Suo
Impact Factor: 1.545
Citation: Acta Mech. Sin.
Frequency: Bimonthly
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Acta Mechanica Sinica--2018, 34 (4)   Published: 20 August 2018
FLUID MECHANICS
Application of particle splitting method for both hydrostatic and hydrodynamic cases in SPH
W.T. Liu, P.N. Sun, F.R. Ming, A.M. Zhang
Abstract

SPH method with numerical diffusive terms shows satisfactory stability and accuracy in some violent fluid-solid interaction problems. However, in most simulations, uniform particle distributions are used and the multi-resolution, which can obviously improve the local accuracy and the overall computational efficiency, has seldom been applied. In this paper, a dynamic particle splitting method is applied and it allows for the simulation of both hydrostatic and hydrodynamic problems. The splitti...

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Theoretical analysis for the mechanical behavior caused by electromagnetic cycle in ITER Nb3Sn Cable-In-Conduit conductors
Donghua Yue, Xingyi Zhang, You-He Zhou
Abstract

The central solenoid (CS) is one of key components of the International Thermonuclear Experimental Reactor (ITER) tokamak and which is often considered as the heart of this fusion reactor. This solenoid will be built by using Nb3Sn cable-in-conduit conductors (CICC), capable of generating 13 Tesla magnetic field. In order to assess the performance of the Nb3Sn CICC nearly the ITER condition,many short samples have been evaluated at the SULTAN test facility (the backgroun...

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An efficient unstructured WENO method for supersonic reactive flows
Wen-geng Zhao, Hong-wei Zheng, Feng-junLiu, Xiao-tian Shi, Jun Gao, Ning Hu, Meng Lv, Si-cong Chen, Hong-da Zhao
Abstract

An efficient high-order numerical method for supersonic reactive flows is proposed in this article. The reactive source term and convection term are solved separately by splitting scheme. In the reaction step, an adaptive time-step method is presented, which can improve the efficiency greatly. In the convection step, a third-order accurate weighted essentially non-oscillatory(WENO) method is adopted to reconstruct the solution in the unstructured grids. Numerical results show that our new met...

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Study of droplet flow in the T-shape microchannel with the bottom wall fluctuation
Yan Pang, Xiang Wang, Zhaomiao Liu
Abstract

The droplet generation in a T-shape microchannel with the main channel width of 50 μm, the side channel width of 25μm and the height of 50 μm, is simulated to study the effects of the forced fluctuation of the bottom wall. The periodic fluctuations of the bottom wallare applied on the near junction part of the main channel in the T-shape microchannel.Effects of bottom wall’s shape, fluctuation periods and amplitudes on the droplet generation are covered in the research of this ...

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A novel method for predicting the power outputs of wave energy converters
Yingguang Wang
Abstract

This paper focuses on realistically predicting the power outputs of wave energy converters operating in shallow water nonlinear waves. A heaving two-body point absorber is utilized as a specific calculation example, and the generated power of the point absorber has been predicted by using a novel method (a nonlinear simulation method) that incorporates a second order random wave model into a nonlinear dynamic filter. It is demonstrated that the second order random wave model in this article c...

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SOLID MECHANICS
Structural eigenvalue analysis under the constraint of fuzzy convex set model
Wencai Sun, Zichun Yang, Guobing Chen
Abstract

In small sample-size problems, determining and controlling the errors of ordinary rigid convex set models are difficult. Therefore, a new uncertainty model named fuzzy convex set (FCS) model is built and investigated in detail. An approach was developed to analyze the fuzzy properties of the structural eigenvalues with FCS constraints. Through this method, the approximate possibility distribution of the structural eigenvalue can be obtained. Furthermore, based on the symmetric F-prog...

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Three-point bending of honeycomb sandwich beams with facesheet perforations
Pengbo Su, Bin Han, Zhongnan Zhao, Qiancheng Zhang, Tianjian Lu
Abstract

A novel square honeycomb-cored sandwich beam with perforated bottom facesheet is investigated under three-point bending, both analytically and numerically. Perforated square holes in the bottom facesheet are characterized by the area ratio of the hole to intact facesheet (perforation ratio). While for large-scale engineering applications like the decks of cargo vehicles and transportation ships, the perforations are needed to facilitate the fabrication process (e.g., laser welding) a...

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Explicit frequency equations of free vibration of nonlocal timoshenko beam with surface effects
Hai-Sheng Zhao, Yao Zhang, Seng-Tjhen Lie
Abstract

Considerations of nonlocal elasticity and surface effects in micro-nano scale beams are both important on the accurate prediction of natural frequency. In this study, the governing equation of a nonlocal Timoshenko beam with surface effects is established by taking into account three types of boundary conditions: hinged-hinged, clamped-clamped and clamped-hinged ends. For a hinged-hinged beam, an exact and explicit natural frequency equation is obtained. However, for clamped-clamped and clamp...

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A refined finite element method for bending analysis of laminated plates integrated with piezoelectric fiber reinforced composite actuators
J. Rouzegar, A. Abbasi
Abstract

This research presents a finite element formulation based on four-variable refined plate theory for bending analysis of cross-ply and angle-ply laminated composite plate integrated with piezoelectric fiber reinforced composite (PFRC) actuator under electromechanical loading. The four-variable refined plate theory is a simple and efficient higher-order shear deformation theory (HSDT) which predicts parabolic variation of transverse shear stresses across the plate thickness and satisfies zero t...

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Numerical computation of central crack growth in active particle of electrodes influenced by multiple factors
Yuwei Zhang, Zhansheng Guo
Abstract

Mechanical degradation, especially the fractures in active particles in an electrode, is one of the major reasons why the capacity of lithium-ion batteries fades. This paper proposes a model that couples Li-ion diffusion, stress evolution, and damage mechanics to simulate the growth of central cracks in cathode particles (LiMn2O4) by an extended finite element method (X-FEM) by considering the influence of multiple factors. The simulation shows that particles are likely ...

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The study of reducing the anisotropy of brazilian disc generated in the bonded-particle model
Q. Zhang, X.P. Zhang, P.Q. Ji
Abstract

Brazilian test is widely used to determine the tensile strength of rocks and calibrate parameters in bonded-particle model (BPM). In previous studies, the Brazilian disc is usually trimmed from a compacted rectangular specimen. In the present study, it is found that the tensile strengths obtained from different compressive loading directions are different. Several measures are proposed to reduce the anisotropy of the disc. It reveals that the compactibility of the specimen trimmed into Brazil...

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Isogeometric analysis of free-form timoshenko curved beams including the nonlinear effects of large deformations
Seyed Farhad Hosseini, Ali Hashemian, Behnam Moetakef-Imani, Saied Hadidimoud
Abstract

In the present paper, the isogeometric analysis (IGA) of free-form planar curved beams is formulated based on the nonlinear Timoshenko beam theory to investigate the large deformation of beams with variable curvature. Based on the isoparametric concept, the shape functions of the field variables (displacement and rotation) in a finite element analysis are considered to be the same as the non-uniform rational basis spline (NURBS) basis functions defining the geometry. The validity of the prese...

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An improved dynamic model for silicone material beam with large deformation
Qiping Xu, Jinyang Liu
Abstract

Dynamic modeling for incompressible hyperelastic materials with large deformation effectively is an important issue in biomimetic applications. The previously proposed lower-order full parameterized absolute nodal coordinate formulation (ANCF) beam element employs cubic interpolation in the longitudinal direction and linear interpolation in the transverse direction, whereas it can not accurately describe the large bending deformation. On this account, a novel modeling method for studying dyna...

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DYNAMICS, VIBRATION, AND CONTROL
Review of deployment technology for tethered satellite systems
B.S. Yu, H. Wen, D.P. Jin
Abstract

Tethered satellite systems (TSSs) have attracted significant attention due to their potential and valuable applications for scientific research. With the development of various launched on-orbit missions, the deployment of tethers is considered a crucial technology for operation of a TSS. Both past orbiting experiments and numerical results have shown that oscillations of the deployed tether due to the Coriolis force and environmental perturbations are inevitable and that the impact between t...

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Multibody dynamic analysis using rotation-free shell element with corotational frame
Jiabei Shi, Zhuyong Liu, Jiazhen Hong
Abstract

Rotation-free shell formulation is a simple and effective method in modeling of shell with large deformation. Moreover, it can be compatible with the existing theories of finite element method. However, rotation-free shell is seldom employed in multibody systems. Using a derivative of rigid body motion, an efficient nonlinear shell model is proposed based on the rotation-free shell element and corotational frame. The bending and membrane strains of shell have been simplified by isolating defo...

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A frequency-domain method for solving linear time delay systems with constant coefficients
Mengshi Jin, Wei Chen, Hanwen Song, Jian Xu
Abstract

In an active control system, due to processes such as signal acquisition and transmission, calculation, and actuation, time delay will occur. Time delay systems are usually described by delay differential equations (DDEs). Since it is hard to obtain an analytical solution to a DDE, numerical solution is of necessity. This paper presents a frequency-domain method which uses a truncated transfer function to solve a class of DDEs. The theoretical transfer function is the sum of infinite items ex...

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