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: 1.324
Citation: Acta Mech. Sin.
Frequency: Bimonthly
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Acta Mechanica Sinica--2017, 33 (3)   Published: 20 May 2017
THEMED ARTICLES FOR CCTAM 2017 SPECIAL ISSUE
Preface Hot!
Tian Jian Lu, Wei Shyy, Zhigang Suo
Abstract

To celebrate and witness the 2017 Chinese Congress of Theoretical and Applied Mechanics (CCTAM2017) and the 60th Anniversary of the establishment of the Chinese Society of Theoretical and Applied Mechanics (CSTAM), which is a large professional body consisting of more than 20,000 members from around the globe and also the sponsor of Acta Mechanica Sinica (AMS), we here publish a special collection including twenty-one invited papers in this and the following issues. In this special collection...

High-order discontinuous Galerkin method for applications to multicomponent and chemically reacting flows Hot!
Yu Lv, Matthias Ihme
Abstract

This article focuses on the development of a discontinuous Galerkin (DG) method for simulations of multicomponent and chemically reacting flows. Compared to aerodynamic flow applications, in which DG methods have been successfully employed,DG simulations of chemically reacting flows introduce challenges that arise from flow unsteadiness, combustion, heat release, compressibility effects, shocks, and variations in thermodynamic properties. To address these challenges, algorithms are developed,...

Scaling of energy spectra in weakly compressible turbulence Hot!
Yufeng Dong, Guowei He
Abstract

We find an asymptotic expression for the characteristic timescales of decorrelation processes in weakly compressible and isothermal turbulence. This result is used in the Eddy-Damped Quasi-Normal Markovian equation to derive the scalings of compressible energy spectra:(1) if the acoustic waves are dominant, the compressible energy spectra exhibit -7/3 scaling; (2) if local eddy straining is dominant, the compressible energy spectra are scaled as -3. Meanwhile, the energy spectra of incompress...

The relation between a microscopic threshold-force model and macroscopic models of adhesion Hot!
Srivatsan Hulikal, Kaushik Bhattacharya, Nadia Lapusta
Abstract

This paper continues our recent work on the relationship between discrete contact interactions at the microscopic scale and continuum contact interactions at the macroscopic scale (Hulikal et al. , J. Mech. Phys. Solids 76, 144-161, 2015). The focus of this work is on adhesion. We show that a collection of a large number of discrete elements governed by a threshold-force based model at the microscopic scale collectively gives rise to continuum fracture mechanics at the macroscopic scale. A ke...

Computational dynamics of soft machines Hot!
Haiyan Hu, Qiang Tian, Cheng Liu
Abstract

Soft machine refers to a kind of mechanical system made of soft materials to complete sophisticated missions, such as handling a fragile object and crawling along a narrow tunnel corner, under low cost control and actuation. Hence, soft machines have raised great challenges to computational dynamics. In this review article, recent studies of the authors on the dynamic modeling, numerical simulation, and experimental validation of soft machines are summarized in the framework of multibody syst...

Adaptive nonlinear model predictive control design of a flexible-link manipulator with uncertain parameters Hot!
Fabian Schnelle, Peter Eberhard
Abstract

This paper presents a novel adaptive nonlinear model predictive control design for trajectory tracking of flexible-link manipulators consisting of feedback linearization, linear model predictive control, and unscented Kalman filtering. Reducing the nonlinear system to a linear system by feedback linearization simplifies the optimization problem of the model predictive controller significantly, which, however, is no longer linear in the presence of parameter uncertainties and can potentially l...

Tough and tunable adhesion of hydrogels:experiments and models Hot!
Teng Zhang, Hyunwoo Yuk, Shaoting Lin, German A. Parada, Xuanhe Zhao
Abstract

As polymer networks infiltrated with water, hydrogels are major constituents of animal and plant bodies and have diverse engineering applications. While natural hydrogels can robustly adhere to other biological materials, such as bonding of tendons and cartilage on bones and adhesive plaques of mussels,it is challenging to achieve such tough adhesions between synthetic hydrogels and engineering materials. Recent experiments show that chemically anchoring long-chain polymer networks of tough s...

Lattice Boltzmann modeling of transport phenomena in fuel cells and flow batteries Hot!
Ao Xu, Wei Shyy, Tianshou Zhao
Abstract

Fuel cells and flow batteries are promising technologies to address climate change and air pollution problems. An understanding of the complex multiscale and multiphysics transport phenomena occurring in these electrochemical systems requires powerful numerical tools. Over the past decades, the lattice Boltzmann (LB) method has attracted broad interest in the computational fluid dynamics and the numerical heat transfer communities, primarily due to its kinetic nature making it appropriate for...

Optomechanical soft metamaterials Hot!
Xiangjun Peng, Wei He, Yifan Liu, Fengxian Xin, Tian Jian Lu
Abstract

We present a new type of optomechanical soft metamaterials, which is different from conventional mechanical metamaterials,in that they are simple isotropic and homogenous materials without resorting to any complex nano/microstructures. This metamaterial is unique in the sense that its responses to uniaxial forcing can be tailored by programmed laser inputs to manifest different nonlinear constitutive behaviors, such as monotonic, S-shape, plateau, and non-monotonic snapping performance. To de...

FLUID MECHANICS
Mechanisms of rectangular groove-induced multiple-microdroplet coalescences
Feng Shen, Yi Li, Guiren Wang, Zhaomiao Liu
Abstract

The mechanism of microdroplet coalescence is a fundamental issue for droplet-based microfluidics. We developed an asymmetric expansion (a rectangular groove) along one side of a microchannel to achieve multiple-microdroplet trapping, collision, and coalescence. Compared with reported symmetric expansions, this asymmetric groove could easily trap microdroplets and control two or three microdroplet coalescences precisely without a requirement for temporal and spatial synchronization. To reveal ...

Gravitational effects on global hemodynamics in different postures:A closed-loop multiscale mathematical analysis
Xiancheng Zhang, Shigeho Noda, Ryutaro Himeno, Hao Liu
Abstract

We present a novel methodology and strategy to predict pressures and flow rates in the global cardiovascular network in different postures varying from supine to upright. A closed-loop, multiscale mathematical model of the entire cardiovascular system (CVS) is developed through an integration of one-dimensional (1D) modeling of the large systemic arteries and veins, and zero-dimensional (0D) lumped-parameter modeling of the heart,the cardiac-pulmonary circulation, the cardiac and venous valve...

SOLID MECHANICS
A macroscopic multi-mechanism based constitutive model for the thermo-mechanical cyclic degeneration of shape memory effect of NiTi shape memory alloy
Chao Yu, Guozheng Kang, Qianhua Kan
Abstract

A macroscopic based multi-mechanism constitutive model is constructed in the framework of irreversible thermodynamics to describe the degeneration of shape memory effect occurring in the thermo-mechanical cyclic deformation of NiTi shape memory alloys (SMAs). Three phases, austenite A, twinned martensite Mt and detwinned martensite Md, as well as the phase transitions occurring between each pair of phases (AMt...

DYNAMICS, VIBRATION, AND CONTROL
Optimal feedback gains of a delayed proportional-derivative (PD) control for balancing an inverted pendulum
Qiang Wang, Zaihua Wang
Abstract

In the dynamics analysis and synthesis of a controlled system, it is important to know for what feedback gains can the controlled system decay to the demanded steady state as fast as possible. This article presents a systematic method for finding the optimal feedback gains by taking the stability of an inverted pendulum system with a delayed proportional-derivative controller as an example. First, the condition for the existence and uniqueness of the stable region in the gain plane is obtaine...

 
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