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 (1)   Published: 20 January 2017
FLUID MECHANICS
Effects of tension on vortex-induced vibration (VIV) responses of a long tensioned cylinder in uniform flows
Ling Kang, Fei Ge, Xiaodong Wu, Youshi Hong
Abstract

The effects of tension on vortex-induced vibration (VIV) responses for a tension-dominated long cylinder with an aspect ratio of 550 in uniform flows are experimentally investigated in this paper. The results show that elevated tension suppresses fluctuations of maximum displacement with respect to flow velocity and makes chaotic VIV more likely to appear. With respect to periodic VIV, if elevated tension is applied, the dominant vibration frequency in the in-line (IL) direction will switch f...

Coherent structures and wavepackets in subsonic transitional turbulent jets
Haihua Yang, Xingchen Zhang, Lingke Ran, Dejun Sun, Zhenhua Wan
Abstract

A large eddy simulation (LES) is performed for two subsonic jets with a Reynolds number of Re=105, which have different core temperatures, i.e., the cold and hot jet. The far-field overall sound pressure levels (OASPL) and noise spectra are well validated against previous experimental results. It is found that the OASPL is raised by heating at shallow angles. The most energetic coherent structures are extracted with specified frequencies using the filter based on the frequ...

A corrected particle method with high-order Taylor expansion for solving the viscoelastic fluid flow
T. Jiang, J. L. Ren, W. G. Lu, B. Xu
Abstract

In this paper, a corrected particle method based on the smoothed particle hydrodynamics (SPH) method with high-order Taylor expansion (CSPH-HT) for solving the viscoelastic flow is proposed and investigated. The validity and merits of the CSPH-HT method are first tested by solving the nonlinear high order Kuramoto-Sivishinsky equation and simulating the drop stretching, respectively. Then the flow behaviors behind two stationary tangential cylinders of polymer melt, which have been received l...

Effects of hysteresis of static contact angle (HSCA) and boundary slip on the hydrodynamics of water striders
J. Zheng, B. S. Wang, W. Q. Chen, X. Y. Han, C. F. Li, J. Z. Zhang, K. P. Yu
Abstract

It is known that contact lines keep relatively still on solids until static contact angles exceed an interval of hysteresis of static contact angle (HSCA), and contact angles keep changing as contact lines relatively slide on the solid. Here, the effects of HSCA and boundary slip were first distinguished on the micro-curvature force (MCF) on the seta. Hence, the total MCF is partitioned into static and dynamic MCFs correspondingly. The static MCF was found proportional to the HSCA and related...

On the solution of Stokes equations for plane boundaries
Y. Qin, R. Sun
Abstract

In a recent paper (Li et al., Acta Mech. Sin. 31, 32-44, 2015), the authors claimed that the general solution of steady Stokes flows can be compactly expressed using only two harmonic functions. They present two cases of a flat plate translating through a viscous fluid. The present paper shows that such a two-harmonic solution does not describe the rotation of a circular plate in an unbounded fluid and thus confirms that at least three independent harmonics are required to express the general...

SOLID MECHANICS
Experimental investigations of mechanical and reaction responses for drop-weight impacted energetic particles
Xiao-Wei Bao, Yan-Qing Wu, Ming-Yang Wang, Feng-Lei Huang
Abstract

Low-velocity drop-weight impact experiments on individual and multiple Cyclotetramethylene tetranitramine (HMX) energetic particles were performed using a modified drop-weight machine equipped with high-speed photography components. Multiple particles experienced more severe burning reactions than an individual particle. Comparisons between impacted salt and HMX particle show that jetting in HMX is mainly due to the motion of fragmented particles driven by gaseous reaction products. Velocity ...

Bending-induced extension in two-dimensional crystals
Douxing Pan, Yao Li, Tzu-Chiang Wang, Wanlin Guo
Abstract

We find by ab initio simulations that significant overall tensile strain can be induced by pure bending in a wide range of two-dimensional crystals perpendicular to the bending moment, just like an accordion being bent to open. This bending-induced tensile strain increases in a power law with bent curvature and can be over 20% in monolayered black phosphorus and transition metal dichalcogenides at a moderate curvature of 2 nm-1 but more than an order weaker in graphene and hexagon ...

A universal method to calculate the surface energy density of spherical surfaces in crystals
Jian Wang, Jianjun Bian, Xinrui Niu, Gangfeng Wang
Abstract

Surface energy plays an important role in the mechanical performance of nanomaterials; however, determining the surface energy density of curved surfaces remains a challenge. In this paper, we conduct atomic simulations to calculate the surface energy density of spherical surfaces in various crystalline metals. It is found that the average surface energy density of spherical surfaces remains almost constant once its radius exceeds 5 nm. Then, using a geometrical analysis and the scaling law, ...

A reconstructed edge-based smoothed DSG element based on global coordinates for analysis of Reissner-Mindlin plates
Gang Yang, De'an Hu, Shuyao Long
Abstract

A reconstructed edge-based smoothed triangular element, which is incorporated with the discrete shear gap (DSG) method, is formulated based on the global coordinate for analysis of Reissner-Mindlin plates. A symbolic integration combined with the smoothing technique is implemented to calculate the smoothed finite element matrices, which is integrated along the boundaries of each smoothing cell. Numerical results show that the proposed element is free from shear locking, and its results are in...

An energy-consistent fracture model for ferroelectrics
Hongchen Miao, Faxin Li
Abstract

The fracture behavior of ferroelectrics has been intensively studied in recent decades, though currently a widely accepted fracture mechanism is still lacking. In this work, enlightened by previous experimental observations that crack propagation in ferroelectrics is always accompanied by domain switching, we propose a micromechanical model in which both crack propagation and domain switching are controlled by energy-based criteria. Both electric energy and mechanical energy can induce domain...

In situ strengths of matrix in a composite
Zheng-Ming Huang, Li-Min Xin
Abstract

A major obstacle to achieving reasonable strength prediction of a composite only from its constituent information is in the determination of in situ strengths of the matrix. One can measure only the original strengths of the pure matrix, on the basis of which the predicted transverse strengths of a unidirectional (UD) composite are far from reality. It is impossible to reliably measure matrix in situ strengths. This paper focuses on the correlation between in situ and original strengths. Stre...

Atomistic simulation of free transverse vibration of graphene, hexagonal SiC, and BN nanosheets
Danh-Truong Nguyen, Minh-Quy Le, Thanh-Lam Bui, Hai-Le Bui
Abstract

Free transverse vibration of monolayer graphene, boron nitride (BN), and silicon carbide (SiC) sheets is investigated by using molecular dynamics finite element method. Eigenfrequencies and eigenmodes of these three sheets in rectangular shape are studied with different aspect ratioswith respect to various boundary conditions. It is found that aspect ratios and boundary conditions affect in a similar way on natural frequencies of graphene, BN, and SiC sheets. Natural frequencies in all modes ...

Finite deformation analysis of crack tip fi elds in plastically compressible hardening-softening-hardening solids
D. Khan, S. Singh, A. Needleman
Abstract

Crack tip fields are calculated under plane strain small scale yielding conditions. The material is characterized by a finite strain elastic-viscoplastic constitutive relation with various hardening-softening-hardening hardness functions. Both plastically compressible and plastically incompressible solids are considered. Displacements corresponding to the isotropic linear elastic mode I crack field are prescribed on a remote boundary. The initial crack is taken to be a semi-circular notch and...

Interactive buckling of an inflated envelope under mechanical and thermal loads
C. G. Wang, M. X. Liu, H. F. Tan
Abstract

This paper elucidates the interactive buckling behaviors of an inflated envelope under coupled mechanical and thermal loads, especially the longitudinal wrinkling bifurcation and hoop ovalization buckling. The longitudinal bending buckling process of the inflated envelope can be divided into three continuous stages, which are global buckling, interactive global-local buckling, and kink. A variety of hoop ovalization buckling modes are observed under coupled mechanical-thermal load. Unlike the...

Reflection and transmission of elastic waves at five types of possible interfaces between two dipolar gradient elastic half-spaces
Yueqiu Li, Peijun Wei
Abstract

Reflection and transmission of an incident plane wave at five types of possible interfaces between two dipolar gradient elastic solids are studied in this paper. First, the explicit expressions of monopolar tractions and dipolar tractions are derived from the postulated function of strain energy density. Then, the displacements, the normal derivative of displacements, monopolar tractions, and dipolar tractions are used to create the nontraditional interface conditions. There are five types of...

DYNAMICS, VIBRATION AND CONTROL
A new subregion mesh method for the investigation of the elastic-plastic impact in flexible multibody systems
Peng Chen, Jin-Yang Liu, Guang-Can Lu
Abstract

Impact processes between flexible bodies often lead to local stress concentration and wave propagation of high frequency. Therefore, the modeling of flexible multibody systems involving impact should consider the local plastic deformation and the strict requirements of the spatial discretization. Owing to the nonlinearity of the stiffness matrix, the reduction of the element number is extremely important. For the contact-impact problem, since different regions have different requirements rega...

Analysis of chaos behaviors of a bistable piezoelectric cantilever power generation system by the second-order Melnikov function
Shu Sun, Shu-Qian Cao
Abstract

By applying the second order Melnikov function, the chaos behaviors of a bistable piezoelectric cantilever power generation system are analyzed. Firstly, the conditions for emerging chaos of the system are derived by the second order Melnikov function. Secondly, the effects of each item in chaos threshold expression are analyzed. The excitation frequency and resistance values, which have the most influence on chaos threshold value, are found. The result from the second order Melnikov function...

Analytical method for the attitude stability of partially liquid filled spacecraft with flexible appendage
Yulong Yan, Baozeng Yue
Abstract

In this paper, the attitude stability of liquidfilled spacecraft with flexible appendage is investigated. The motion of liquid sloshing is modeled as the spherical pendulum, and the flexible appendage is approached by a linear shearing beam. Nonlinear dynamic equations of the coupled system are derived from the Hamiltonian. The stability of the coupled system was analyzed by using the energy-Casimir method, and the nonlinear stability theorem of the coupled spacecraft system was also obtained...

 
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