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--2017, 33 (2)   Published: 20 March 2017
THEMED ARTICLE ON MOLECULAR, CELLULAR, AND TISSUE MECHANOBIOLOGY
Preface: molecular, cellular, and tissue mechanobiology Hot!
Xi-Qiao Feng, Peter Vee Sin Lee, Chwee Teck Lim
Abstract
Growing actin networks regulated by obstacle size and shape Hot!
Bo Gong, Ji Lin, Jin Qian
Abstract

Growing actin networks provide the driving force for the motility of cells and intracellular pathogens. Based on the molecular-level processes of actin polymerization, branching, capping, and depolymerization, we have developed a modeling framework to simulate the stochastic and cooperative behaviors of growing actin networks in propelling obstacles, with an emphasis on the size and shape effects onwork capacity and filament orientation in the growing process. Our results show that the charac...

Mechanics of water pore formation in lipid membrane under electric field Hot!
Bing Bu, Dechang Li, Jiajie Diao, Baohua Ji
Abstract

Transmembrane water pores are crucial for substance transport through cell membranes via membrane fusion, such as in neural communication. However, the molecular mechanism of water pore formation is not clear. In this study, we apply all-atom molecular dynamics and bias-exchange metadynamics simulations to study the process of water pore formation under an electric field.We show that water molecules can enter a membrane under an electric field and form a water pore of a few nanometers in diam...

Effects of adenosine triphosphate concentration on motor force regulation during skeletal muscle contraction Hot!
J. Wei, C. Dong, B. Chen
Abstract

We employ a mechanical model of sarcomere to quantitatively investigate how adenosine triphosphate (ATP) concentration affects motor force regulation during skeletal muscle contraction. Our simulation indicates that there can be negative cross-bridges resisting contraction within the sarcomere and higher ATP concentration would decrease the resistance force from negative cross-bridges by promoting their timely detachment. It is revealed that the motor force is well regulated only when ATP con...

A dynamic cellular vertex model of growing epithelial tissues Hot!
Shao-Zhen Lin, Bo Li, Xi-Qiao Feng
Abstract

Intercellular interactions play a significant role in a wide range of biological functions and processes at both the cellular and tissue scales, for example, embryogenesis, organogenesis, and cancer invasion. In this paper, a dynamic cellular vertex model is presented to study the morphomechanics of a growing epithelial monolayer. The regulating role of stresses in soft tissue growth is revealed. It is found that the cells originating from the same parent cell in the monolayer can orchestrate...

The race to the nociceptor: mechanical versus temperature effects in thermal pain of dental neurons Hot!
Min Lin, Fusheng Liu, Shaobao Liu, Changchun Ji, Ang Li, Tian Jian Lu, Feng Xu
Abstract

The sensing of hot and cold stimuli by dental neurons differs in several fundamental ways. These sensations have been characterized quantitatively through the measured time course of neural discharge signals that result from hot or cold stimuli applied to the teeth of animal models. Although various hypotheses have been proposed to explain the underlying mechanism, the ability to test competing hypotheses against experimental recorded data using biophysical models has been hindered by limitat...

Osteoporosis affects both post-yield microdamage accumulation and plasticity degradation in vertebra of ovariectomized rats Hot!
Siwei Li, Guodong Niu, Neil X. Dong, Xiaodu Wang, Zhongjun Liu, Chunli Song, Huijie Leng
Abstract

Estrogen withdrawal in postmenopausal women increases bone loss and bone fragility in the vertebra. Bone loss with osteoporosis not only reduces bone mineral density (BMD), but actually alters bone quality, which can be comprehensively represented by bone post-yield behaviors. This study aimed to provide some information as to how osteoporosis induced by estrogen depletion could influence the evolution of post-yield microdamage accumulation and plastic deformation in vertebral bodies. This st...

FLUID MECHANICS
The energy transfer mechanism of a perturbed solid-body rotation flow in a rotating pipe
Chunjuan Feng, Feng Liu, Zvi Rusak, Shixiao Wang
Abstract

Three-dimensional direct numerical simulations of a solid-body rotation superposed on a uniform axial flow entering a rotating constant-area pipe of finite length are presented. Steady in time profiles of the radial, axial, and circumferential velocities are imposed at the pipe inlet. Convective boundary conditions are imposed at the pipe outlet. The Wang and Rusak (Phys. Fluids 8:1007-1016, 1996. doi:10.1063/1.86882) axisymmetric instability mechanism is retrieved at certain operational cond...

Optimal flow conditions of a tracheobronchial model to reengineer lung structures
Stefano Casarin, Federico Aletti, Giuseppe Baselli, Marc Garbey
Abstract

The high demand for lung transplants cannot be matched by an adequate number of lungs from donors. Since fully ex-novo lungs are far from being feasible, tissue engineering is actively considering implantation of engineered lungs where the devitalized structure of a donor is used as scaffold to be repopulated by stem cells of the receiving patient. A decellularized donated lung is treated inside a bioreactor where transport through the tracheobronchial tree (TBT) will allow for both depositio...

Rotating electroosmotic flow of an Eyring fluid
Cheng Qi, Chiu-On Ng
Abstract

A perturbation analysis is presented in this paper for the electroosmotic (EO) flow of an Eyring fluid through a wide rectangular microchannel that rotates about an axis perpendicular to its own. Mildly shear-thinning rheology is assumed such that at the leading order the problem reduces to that of Newtonian EO flow in a rotating channel, while the shear thinning effect shows up in a higher-order problem. Using the relaxation time as the small ordering parameter, analytical solutions are dedu...

A three-dimensional numerical study on instability of sinusoidal flame induced by multiple shock waves
Xiao Chen, Gang Dong, Hua Jiang
Abstract

The instabilities of a three-dimensional sinusoidally premixed flame induced by an incident shock wave with Mach=1.7 and its reshock waves were studied by using the Navier-Stokes (NS) equations with a single-step chemical reaction and a high resolution, 9th-order weighted essentially non-oscillatory scheme. The computational results were validated by the grid independence test and the experimental results in the literature. The computational results show that after the passage of incident sho...

Motion visualization and estimation for flapping wing systems
Tzu-Sheng Shane Hsu, Timothy Fitzgerald, Vincent Phuc Nguyen, Trisha Patel, Balakumar Balachandran
Abstract

Studies of fluid-structure interactions associated with flexible structures such as flapping wings require the capture and quantification of large motions of bodies that may be opaque. As a case study, motion capture of a free flying Manduca sexta, also known as hawkmoth, is considered by using three synchronized high-speed cameras. A solid finite element (FE) representation is used as a reference body and successive snapshots in time of the displacement fields are reconstructed via an optimi...

Study on three-dimensional expansion characteristics of four wall combustion-gas jets in confined liquid space
Zhitao Hu, Yonggang Yu
Abstract

To explore further the launch mechanism of the newunderwater launching technology proposed in this paper, the expansion characteristics of four wall combustion-gas jets in confined liquid space must be studied firstly. The experimental device is designed, and the high-speed digital photographic system is adopted to obtain the expansion sequence processes of Taylor cavities formed by the four wall jets. Meanwhile, the influence of the injection pressure on the axial expansion property of the f...

SOLID MECHANICS
Normal compression wave scattering by a permeable crack in a fluid-saturated poroelastic solid
Yongjia Song, Hengshan Hu, John W. Rudnicki
Abstract

A mathematical formulation is presented for the dynamic stress intensity factor (mode I) of a finite permeable crack subjected to a time-harmonic propagating longitudinal wave in an infinite poroelastic solid. In particular, the effect of the wave-induced fluid flow due to the presence of a liquid-saturated crack on the dynamic stress intensity factor is analyzed. Fourier sine and cosine integral transforms in conjunction with Helmholtz potential theory are used to formulate the mixed boundar...

A novel implementation algorithm of asymptotic homogenization for predicting the effective coefficient of thermal expansion of periodic composite materials
Yongcun Zhang, Shipeng Shang, Shutian Liu
Abstract

Asymptotic homogenization (AH) is a general method for predicting the effective coefficient of thermal expansion (CTE) of periodic composites. It has a rigorous mathematical foundation and can give an accurate solution if the macrostructure is large enough to comprise an infinite number of unit cells. In this paper, a novel implementation algorithm of asymptotic homogenization (NIAH) is developed to calculate the effective CTE of periodic composite materials. Compared with the previous implem...

Experimental study and electromechanical model analysis of the nonlinear deformation behavior of IPMC actuators
Hongguang Liu, Ke Xiong, Kan Bian, Kongjun Zhu
Abstract

This paper develops analytical electromechanical formulas to predict the mechanical deformation of ionic polymer-metal composite (IPMC) cantilever actuators under DC excitation voltages. In this research, IPMC samples with Pt and Ag electrodes were manufactured, and the large nonlinear deformation and the effect of curvature on surface electrode resistance of the IPMC samples were investigated experimentally and theoretically. A distributed electrical modelwas modified for calculating the dis...

Experimental study on cracking behaviour of moulded gypsum containing two non-parallel overlapping flaws under uniaxial compression
Lekan Olatayo Afolagboye, Jianming He, Sijing Wang
Abstract

Failure of rock mass that is subjected to compressive loads occurs from initiation, propagation, and linkage of new cracks from preexisting fissures. Our research investigates the cracking behaviour and coalescence process in a brittle material with two non-parallel overlapping flaws using a high-speed camera. The coalescence tensile crack and tensile wing cracks were the first cracks to occur from the preexisting flaws. The initiation stresses of the primary cracks at the two tips of each fl...

The axisymmetric torsional contact problem of a functionally graded piezoelectric coated half-space
Jie Su, Liao-Liang Ke, Yue-Sheng Wang, Yang Xiang
Abstract

In this article, we study the axisymmetric torsional contact problem of a half-space coated with functionally graded piezoelectric material (FGPM) and subjected to a rigid circular punch. It is found that, along the thickness direction, the electromechanical properties of FGPMs change exponentially. We apply the Hankel integral transform technique and reduce the problem to a singular integral equation, and then numerically determine the unknown contact stress and electric displacement at the ...

Band structures of transverse waves in nanoscale multilayered phononic crystals with nonlocal interface imperfections by using the radial basis function method
Zhizhong Yan, Chunqiu Wei, Chuanzeng Zhang
Abstract

2016-09-02

DYNAMICS, VIBRATION, AND CONTROL
Experiment-based identification of time delays in linear systems
Meng-Shi Jin, Yi-Qiang Sun, Han-Wen Song, Jian Xu
Abstract

This paper presents an identification approach to time delays in single-degree-of-freedom (SDOF) and multiple-degree-of-freedom (MDOF) systems. In an SDOF system, the impedance function of the delayed system is expressed by the system parameters, the feedback gain, and the time delay. The time delay can be treated as the “frequency” of the difference between the impedance function of the delayed system and that of the corresponding uncontrolled system. Thus, it can be identified f...

Dynamic interactions of an integrated vehicle-electromagnetic energy harvester-tire system subject to uneven road excitations
Jing Tang Xing, Zhe Sun, Sulian Zhou, Mingyi Tan
Abstract

An investigation is undertaken of an integrated mechanical-electromagnetic coupling system consisting of a rigid vehicle with heave, roll, and pitch motions, four electromagnetic energy harvesters and four tires subject to uneven road excitations in order to improve the passengers' riding comfort and harvest the lost engine energy due to uneven roads. Following the derived mathematical formulations and the proposed solution approaches, the numerical simulations of this interaction system subj...

On the geometric phase in the spatial equilibria of nonlinear rods
Peinan Zhong, Guojun Huang, Guowei Yang
Abstract

Geometric phases have natural manifestations in large deformations of geometrically exact rods. The primary concerns of this article are the physical implications and observable consequences of geometric phases arising from the deformed patterns exhibited by a rod subjected to end moments.This mechanical problem is classical and has a long tradition dating back to Kirchhoff. However, the perspective from geometric phases seems to go more deeply into relations between local strain states and g...

BIOMECHANICS
Hemodynamic analysis of intracranial aneurysms using phase-contrast magnetic resonance imaging and computational fluid dynamics
Xuemei Zhao, Rui Li, Yu Chen, Sheau Fung Sia, Donghai Li, Yu Zhang, Aihua Liu
Abstract

Additional hemodynamic parameters are highly desirable in the clinical management of intracranial aneurysm rupture as static medical images cannot demonstrate the blood flow within aneurysms. There are two ways of obtaining the hemodynamic information—by phase-contrast magnetic resonance imaging (PCMRI) and computational fluid dynamics (CFD). In this paper, we compared PCMRI and CFD in the analysis of a stable patient's specific aneurysm. The results showed that PCMRI and CFD are in goo...

THEMED ARTICLE ON MOLECULAR, CELLULAR, AND TISSUE MECHANOBIOLOGY
Preface: molecular, cellular, and tissue mechanobiology Hot!
Xi-Qiao Feng, Peter Vee Sin Lee, Chwee Teck Lim
Abstract
Growing actin networks regulated by obstacle size and shape Hot!
Bo Gong, Ji Lin, Jin Qian
Abstract

Growing actin networks provide the driving force for the motility of cells and intracellular pathogens. Based on the molecular-level processes of actin polymerization, branching, capping, and depolymerization, we have developed a modeling framework to simulate the stochastic and cooperative behaviors of growing actin networks in propelling obstacles, with an emphasis on the size and shape effects onwork capacity and filament orientation in the growing process. Our results show that the charac...

Mechanics of water pore formation in lipid membrane under electric field Hot!
Bing Bu, Dechang Li, Jiajie Diao, Baohua Ji
Abstract

Transmembrane water pores are crucial for substance transport through cell membranes via membrane fusion, such as in neural communication. However, the molecular mechanism of water pore formation is not clear. In this study, we apply all-atom molecular dynamics and bias-exchange metadynamics simulations to study the process of water pore formation under an electric field.We show that water molecules can enter a membrane under an electric field and form a water pore of a few nanometers in diam...

Effects of adenosine triphosphate concentration on motor force regulation during skeletal muscle contraction Hot!
J. Wei, C. Dong, B. Chen
Abstract

We employ a mechanical model of sarcomere to quantitatively investigate how adenosine triphosphate (ATP) concentration affects motor force regulation during skeletal muscle contraction. Our simulation indicates that there can be negative cross-bridges resisting contraction within the sarcomere and higher ATP concentration would decrease the resistance force from negative cross-bridges by promoting their timely detachment. It is revealed that the motor force is well regulated only when ATP con...

A dynamic cellular vertex model of growing epithelial tissues Hot!
Shao-Zhen Lin, Bo Li, Xi-Qiao Feng
Abstract

Intercellular interactions play a significant role in a wide range of biological functions and processes at both the cellular and tissue scales, for example, embryogenesis, organogenesis, and cancer invasion. In this paper, a dynamic cellular vertex model is presented to study the morphomechanics of a growing epithelial monolayer. The regulating role of stresses in soft tissue growth is revealed. It is found that the cells originating from the same parent cell in the monolayer can orchestrate...

The race to the nociceptor: mechanical versus temperature effects in thermal pain of dental neurons Hot!
Min Lin, Fusheng Liu, Shaobao Liu, Changchun Ji, Ang Li, Tian Jian Lu, Feng Xu
Abstract

The sensing of hot and cold stimuli by dental neurons differs in several fundamental ways. These sensations have been characterized quantitatively through the measured time course of neural discharge signals that result from hot or cold stimuli applied to the teeth of animal models. Although various hypotheses have been proposed to explain the underlying mechanism, the ability to test competing hypotheses against experimental recorded data using biophysical models has been hindered by limitat...

Osteoporosis affects both post-yield microdamage accumulation and plasticity degradation in vertebra of ovariectomized rats Hot!
Siwei Li, Guodong Niu, Neil X. Dong, Xiaodu Wang, Zhongjun Liu, Chunli Song, Huijie Leng
Abstract

Estrogen withdrawal in postmenopausal women increases bone loss and bone fragility in the vertebra. Bone loss with osteoporosis not only reduces bone mineral density (BMD), but actually alters bone quality, which can be comprehensively represented by bone post-yield behaviors. This study aimed to provide some information as to how osteoporosis induced by estrogen depletion could influence the evolution of post-yield microdamage accumulation and plastic deformation in vertebral bodies. This st...

SOLID MECHANICS
Normal compression wave scattering by a permeable crack in a fluid-saturated poroelastic solid
Yongjia Song, Hengshan Hu, John W. Rudnicki
Abstract

A mathematical formulation is presented for the dynamic stress intensity factor (mode I) of a finite permeable crack subjected to a time-harmonic propagating longitudinal wave in an infinite poroelastic solid. In particular, the effect of the wave-induced fluid flow due to the presence of a liquid-saturated crack on the dynamic stress intensity factor is analyzed. Fourier sine and cosine integral transforms in conjunction with Helmholtz potential theory are used to formulate the mixed boundar...

A novel implementation algorithm of asymptotic homogenization for predicting the effective coefficient of thermal expansion of periodic composite materials
Yongcun Zhang, Shipeng Shang, Shutian Liu
Abstract

Asymptotic homogenization (AH) is a general method for predicting the effective coefficient of thermal expansion (CTE) of periodic composites. It has a rigorous mathematical foundation and can give an accurate solution if the macrostructure is large enough to comprise an infinite number of unit cells. In this paper, a novel implementation algorithm of asymptotic homogenization (NIAH) is developed to calculate the effective CTE of periodic composite materials. Compared with the previous implem...

Experimental study and electromechanical model analysis of the nonlinear deformation behavior of IPMC actuators
Hongguang Liu, Ke Xiong, Kan Bian, Kongjun Zhu
Abstract

This paper develops analytical electromechanical formulas to predict the mechanical deformation of ionic polymer-metal composite (IPMC) cantilever actuators under DC excitation voltages. In this research, IPMC samples with Pt and Ag electrodes were manufactured, and the large nonlinear deformation and the effect of curvature on surface electrode resistance of the IPMC samples were investigated experimentally and theoretically. A distributed electrical modelwas modified for calculating the dis...

Experimental study on cracking behaviour of moulded gypsum containing two non-parallel overlapping flaws under uniaxial compression
Lekan Olatayo Afolagboye, Jianming He, Sijing Wang
Abstract

Failure of rock mass that is subjected to compressive loads occurs from initiation, propagation, and linkage of new cracks from preexisting fissures. Our research investigates the cracking behaviour and coalescence process in a brittle material with two non-parallel overlapping flaws using a high-speed camera. The coalescence tensile crack and tensile wing cracks were the first cracks to occur from the preexisting flaws. The initiation stresses of the primary cracks at the two tips of each fl...

The axisymmetric torsional contact problem of a functionally graded piezoelectric coated half-space
Jie Su, Liao-Liang Ke, Yue-Sheng Wang, Yang Xiang
Abstract

In this article, we study the axisymmetric torsional contact problem of a half-space coated with functionally graded piezoelectric material (FGPM) and subjected to a rigid circular punch. It is found that, along the thickness direction, the electromechanical properties of FGPMs change exponentially. We apply the Hankel integral transform technique and reduce the problem to a singular integral equation, and then numerically determine the unknown contact stress and electric displacement at the ...

Band structures of transverse waves in nanoscale multilayered phononic crystals with nonlocal interface imperfections by using the radial basis function method
Zhizhong Yan, Chunqiu Wei, Chuanzeng Zhang
Abstract

2016-09-02

 
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