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: 0.832
Citation: Acta Mech. Sin.
Frequency: Bimonthly
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Acta Mechanica Sinica--2016, 32 (6)   Published: 20 November 2016
THEMED ARTICLE ON FLUID-STRUCTURE INTERACTIONS WITH APPLICATIONS TO BIOLOGY
Fluid-structure interactions with applications to biology Hot!
Wei-Xi Huang, Silas Alben
Abstract
Self-propulsion of flapping bodies in viscous fluids: Recent advances and perspectives Hot!
Shizhao Wang, Guowei He, Xing Zhang
Abstract

Flapping-powered propulsion is used by many animals to locomote through air or water. Here we review recent experimental and numerical studies on self-propelled mechanical systems powered by a flapping motion. These studies improve our understanding of the mutual interaction between actively flapping bodies and surrounding fluids. The results obtained in these works provide not only new insights into biolocomotion but also useful information for the biomimetic design of artificial flyers and ...

Flapping dynamics of a flexible propulsor near ground Hot!
Jaeha Ryu, Sung Goon Park, Boyoung Kim, Hyung Jin Sung
Abstract

The flapping motion of a flexible propulsor near the ground was simulated using the immersed boundary method. The hydrodynamic benefits of the propulsor near the ground were explored by varying the heaving frequency (St) of the leading edge of the flexible propulsor. Propulsion near the ground had some advantages in generating thrust and propelling faster than propulsion away from the ground. The mode analysis and flapping amplitude along the Lagrangian coordinate were examined to an...

Biomimetic flexible plate actuators are faster and more efficient with a passive attachment Hot!
Peter D. Yeh, Alexander Alexeev
Abstract

Using three-dimensional computer simulations, we probe biomimetic free swimming of an internally actuated flexible plate in the regime near the first natural frequency. The plate is driven by an oscillating internal moment approximating the actuation mechanism of a piezoelectric macro fiber composite (MFC) bimorph. We show in our simulations that the addition of a passive attachment increases both swimming velocity and efficiency. Specifically, if the active and passive sections are of simila...

On the gating of mechanosensitive channels by fluid shear stress Hot!
Zhangli Peng, On Shun Pak, Zhe Feng, Allen P. Liu, Yuan-Nan Young
Abstract

Mechanosensation is an important process in biological fluid-structure interaction. To understand the biophysics underlying mechanosensation, it is essential to quantify the correlation between membrane deformation, membrane tension, external fluid shear stress, and conformation of mechanosensitive (MS) channels. Smoothed dissipative particle dynamics (SDPD) simulations of vesicle/cell in three types of flow configurations are conducted to calculate the tension in lipid membrane due to fluid ...

An IB-LBM study of continuous cell sorting in deterministic lateral displacement arrays Hot!
Qiang Wei, Yuan-Qing Xu, Xiao-Ying Tang, Fang-Bao Tian
Abstract

The deterministic lateral displacement (DLD) is an important method used to sort particles and cells of different sizes. In this paper, the flexible cell sorting with the DLD method is studied by using a numerical model based on the immersed boundary-lattice Boltzmann method (IB-LBM). In this model, the fluid motion is solved by the LBM, and the cell membrane-fluid interaction is modeled with the LBM. The proposed model is validated by simulating the rigid particle sorted with the DLD method,...

FLUID MECHANICS
Instability of the interface in two-layer flows with large viscosity contrast at small Reynolds numbers
Jiebin Liu, Jifu Zhou
Abstract

The Kelvin-Helmholtz instability is believed to be the dominant instability mechanism for free shear flows at large Reynolds numbers. At small Reynolds numbers, a new instability mode is identified when the temporal instability of parallel viscous two fluid mixing layers is extended to current-fluid mud systems by considering a composite error function velocity profile. The new mode is caused by the large viscosity difference between the two fluids. This interfacial mode exists when the fluid...

A note on general solution of Stokes equations
B. Sri Padmavati, T. Amaranath
Abstract

Li et al. (2015) claim that it is sufficient to use two harmonic functions to express the general solution of Stokes equations. In this paper, we demonstrate that this is not true in a general case and that we in fact need three scalar harmonic functions to represent the general solution of Stokes equations (Venkatalaxmi et al., 2004).

SOLID MECHANICS
Analytical solutions for elastic binary nanotubes of arbitrary chirality
Lai Jiang, Wanlin Guo
Abstract

Analytical solutions for the elastic properties of a variety of binary nanotubes with arbitrary chirality are obtained through the study of systematic molecular mechanics. This molecular mechanics model is first extended to chiral binary nanotubes by introducing an additional outof-plane inversion term into the so-called stick-spiral model, which results from the polar bonds and the buckling of binary graphitic crystals. The closed-form expressions for the longitudinal and circumferential You...

MoM-based topology optimization method for planar metallic antenna design
Shutian Liu, Qi Wang, Renjing Gao
Abstract

The metallic antenna design problem can be treated as a problem to find the optimal distribution of conductive material in a certain domain. Although this problem is well suited for topology optimization method, the volumetric distribution of conductive material based on 3D finite element method (FEM) has been known to cause numerical bottlenecks such as the skin depth issue, meshed "air regions" and other numerical problems. In this paper a topology optimization method based on the...

Dilation and breakage dissipation of granular soils subjected to monotonic loading
Yifei Sun, Yang Xiao, Hua Ji
Abstract

Dilation and breakage energy dissipation of four different granular soils are investigated by using an energy balance equation. Due to particle breakage, the dilation curve does not necessarily pass through the origin of coordinates. Breakage energy dissipation is found to increase significantly at the initial loading stage and then gradually become stabilised. The incremental dissipation ratio between breakage energy and plastic work exhibits almost independence of the confining pressure. Ac...

A semi-analytical approach for calculating the equilibrium structure and radial breathing mode frequency of single-walled carbon nanotubes
J. Gong, L. Thompson, G. Li
Abstract

A semi-analytical model for determining the equilibrium configuration and the radial breathing mode (RBM) frequency of single-wall carbon nanotubes (CNTs) is presented. By taking advantage of the symmetry characteristics, a CNT structure is represented by five independent variables. A line search optimization procedure is employed to determine the equilibrium values of these variables by minimizing the potential energy. With the equilibrium configuration obtained, the semi-analytical model en...

Closed-form solutions for free vibration of rectangular FGM thin plates resting on elastic foundation
T. F. Xu, Y. F. Xing
Abstract

This article presents closed-form solutions for the frequency analysis of rectangular functionally graded material (FGM) thin plates subjected to initially in-plane loads and with an elastic foundation. Based on classical thin plate theory, the governing differential equations are derived using Hamilton's principle. A neutral surface is used to eliminate stretching-bending coupling in FGM plates on the basis of the assumption of constant Poisson's ratio. The resulting governing equation of FG...

Static and dynamic responses of a microcantilever with a T-shaped tip mass to an electrostatic actuation
B. Firouzi, M. Zamanian, S. A. A. Hosseini
Abstract

In this study, nonlinear static and dynamic responses of a microcantilever with a T-shaped tip mass excited by electrostatic actuations are investigated. The electrostatic force is generated by applying an electric voltage between the horizontal part of T-shaped tip mass and an opposite electrode plate. The cantilever microbeam is modeled as an Euler-Bernoulli beam. The T-shaped tip mass is assumed to be a rigid body and the nonlinear effect of electrostatic force is considered. An equation o...

Thermoelastic analysis of multiple defects with the extended finite element method
Honggang Jia, Yufeng Nie
Abstract

In this paper, the extended finite element method (XFEM) is adopted to analyze the interaction between a single macroscopic inclusion and a single macroscopic crack as well as that between multiple macroscopic or microscopic defects under thermal/mechanical load. The effects of different shapes of multiple inclusions on the material thermomechanical response are investigated, and the level set method is coupled with XFEM to analyze the interaction of multiple defects. Further, the discretized...

DYNAMICS, VIBRATION AND CONTROL
Time-delay identification for vibration systems with multiple feedback
Yi-Qiang Sun, Meng-Shi Jin, Han-Wen Song, Jian Xu
Abstract

An approach for time-delay identification is proposed in multiple-degree-of-freedom (MDOF) linear systems with multiple feedback. The applicability of the approach is discussed in detail. Based on the characteristics of frequency domain in feedback controlled system with multiple time-delays, this paper proposes a time-delay identification approach, which is based on the pseudo impedance function of reference point. Treating feedback time-delays as the "frequencies" of the oscillati...

BIOMECHANICS
Plaque components affect wall stress in stented human carotid artery: A numerical study
Zhen-Min Fan, Xiao Liu, Cheng-Fei Du, An-Qiang Sun, Nan Zhang, Zhan-Ming Fan, Yu-Bo Fan, Xiao-Yan Deng
Abstract

Carotid artery stenting presents challenges of in-stent restenosis and late thrombosis, which are caused primarily by alterations in the mechanical environment of the artery after stent implantation. The present study constructed patient-specific carotid arterial bifurcation models with lipid pools and calcified components based on magnetic resonance imaging. We numerically analyzed the effects of multicomponent plaques on the distributions of von Mises stresses (VMSs) in the patient-specific...

 
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