| Acta Mechanica Sinica |
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| Acta Mechanica Sinica--2010, 26 (6) Published: 25 December 2010 |
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| Twenty-five years of excellence: a retrospective glance of Acta Mechanica Sinica |
| Cheng Geng-Dong |
| Abstract |
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The first English version of Acta Mechanica Sinica
(AMS) was launched in June 1985 in Beijing, aimed at delivering
the cutting-on-edge progress and achievement in Mechanics
in China to the world, allowing world-round colleagues
to access the work of Chinese mechanician, and supplying
an international forum in the field. Its appearance was
a result of 5-year preparation after the consensus agreement
by the Acta Mechanica Sinica editorial board (3rd), and was
approved by the China Associat...
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| Direct numerical simulation of compressible turbulent flows |
| Li Xin-Liang Fu De-Xun Ma Yan-Wen Liang Xian |
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This paper reviews the authors' recent studies on compressible turbulence by
using direct numerical simulation (DNS), including DNS of isotropic
(decaying) turbulence, turbulent mixing-layer, turbulent boundary-layer and
shock/boundary-layer interaction. Turbulence statistics, compressibility
effects, turbulent kinetic energy budget and coherent structures are studied
based on the DNS data. The mechanism of sound source in turbulent flows is
also analyzed. It shows that DNS is a powerful t...
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| Recent development in structural design and optimization |
| Guo Xu Cheng Geng-Dong |
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With the fast development of computational mechanics and the
capacity as well as the speed of modern computers, simulation
based structural optimization has become an indispensable tool in
the design process of competitive products. This paper presents a
brief description of the current status of structural optimization
by reviewing some significant progress made in the last decades.
Potential research topics are also discussed. The entire
literatures of the field are not covered due to t...
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| Mechanics of advanced fiber reinforced lattice composites |
| Fan Hua-Lin Zeng Tao Fang Daining Yang Wei |
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Fiber reinforced lattice composites are light-weight attractive due to their high specific strength and specific stiffness. In the past ten years, researchers developed three-dimensional (3D) lattice trusses and two-dimensional (2D) lattice grids by various methods including interlacing, weaving, interlocking, filament winding and molding hot-press. The lattice composites have been applied in the fields of radar cross-section reduction, explosive absorption and heat-resistance. In this paper, to...
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| On the behaviour characterisation of metallic cellular materials under impact loading |
| Fang Daining Li Yu-Long Zhao Han |
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This paper reviews the common mechanical features of the metallic cellular material under impact loading as well as the characterisation methods of such behaviours. The main focus is on the innovations of various testing methods at impact loading rates. Following aspects were discussed in details. (1) The use of soft nylon Hopkinson/Kolsky bar for an enhanced measuring accuracy in order to assess if there is a strength enhancement or not for this class of cellular materials under moderate impact...
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| New perspective in statistical modeling of wall-bounded turbulence |
| She Zhen-Su Chen Xi Wu You Fazle Hussain |
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Despite dedicated effort for many decades, statistical description of highly technologically important wall turbulence remains a great challenge. Current models are unfortunately incomplete, or empirical, or qualitative. After a review of the existing theories of wall turbulence, we present a new framework, called the structure ensemble dynamics (SED), which aims at integrating the turbulence dynamics into a quantitative description of the mean flow. The SED theory naturally evolves from a stati...
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| Micro air vehicle-motivated computational biomechanics in bio-flights: aerodynamics, flight dynamics and maneuvering stability |
| Liu Hao Toshiyuki Nakata Na Gao Masateru Maeda Hikaru Aono Shyy Wei |
| Abstract |
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Aiming at developing an effective tool to unveil key
mechanisms in bio-flight as well as to provide guidelines for
bio-inspired micro air vehicles (MAVs) design, we propose a
comprehensive computational framework, which integrates
aerodynamics, flight dynamics, vehicle stability and
maneuverability. This framework consists of (1) a Navier--Stokes
unsteady aerodynamic model; (2) a linear finite element model for
structural dynamics; (3) a fluid-structure interaction (FSI) model
for couple...
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| A strain-isolation design for stretchable electronics |
| Jian Wu Ming Li Chen Wei-Qiu Dae-Hyeong Kim Yun-Soung Kim Huang Yong-Gang Hwang Keh-Chih Kang Zhan John A. Rogers |
| Abstract |
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Stretchable electronics represents a direction of recent development in
next-generation semiconductor devices. Such systems have the
potential to offer the performance of conventional wafer-based
technologies, but they can be stretched like a rubber band,
twisted like a rope, bent over a pencil, and folded like a piece
of paper. Isolating the active devices from strains associated with such deformations is an
important aspect of design. One strategy involves the shielding of
the electroni...
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| Transformation method and wave control |
| Chang Zheng Hu Jin Hu Geng-Kai |
| Abstract |
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Transformation method provides an efficient way to control wave
propagation by materials. The transformed relations for field and material
during a transformation are essential to fulfill this method. We propose a
systematic method to derive the transformed relations for a general physic
process, the constraint conditions are obtained by considering geometrical
and physical constraint during a mapping. The proposed method is applied to
Navier's equation for elastodynamics, Helmholtz's equa...
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| Extended multiscale finite element method for mechanical analysis of heterogeneous materials |
| Zhang Hong-Wu Wu Jingkai Lv Jun Fu Zhen-Dong |
| Abstract |
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An extended multiscale finite element method (EMsFEM) is
developed for solving the mechanical problems of heterogeneous
materials in elasticity. The underlying idea of the method is to
construct numerically the multiscale base functions to capture the
small-scale features of the coarse elements in the multiscale
finite element analysis. On the basis of our existing work for
periodic truss materials, the construction methods of the base
functions for continuum heterogeneous materials are s...
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| Interaction forces between soft magnetic particles in uniform and non-uniform magnetic fields |
| Ayyoub Mehdizadeh Renwei Mei James F. Klausner Nima Rahmatian |
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The influence of the magnetization of a soft magnetic sphere on the
surrounding magnetic field is measured and characterized. The interaction
force between two soft magnetic particles is directly measured using an
ultra precision load sensor in uniform and non-uniform magnetic fields. The
interaction force largely follows an inverse fourth power law as a function
of separation distance between particle centers. At small distances, the
effect of magnetization of one particle on the magnetiz...
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| Structural bonding-breakage constitutive model for natural unsaturated clayey soils |
| Cai Quo-Qing Zhao Cheng-Gang Qin Xiao-Ming |
| Abstract |
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The natural clayey soils are usually structural and
unsaturated, which makes their mechanical properties quite different from
the remolded saturated soils. A structural constitutive model is proposed to
simulate the bonding-breakage micro-mechanism. In this model, the
unsaturated soil element is divided into a cementation element and a
friction element according to the binary medium theory, and the
stress-strain coordination for these two elements is obtained. The
cementation element is r...
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| A two variable refined plate theory for the bending analysis of functionally graded plates |
| Ismail Mechab Hassen Ait Atmane Abdeloua hed Tounsi Hichem Abdesselem Belhadj El Abbas Adda Bedia |
| Abstract |
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Bending analysis of functionally graded plates using the two variable
refined plate theory is presented in this paper. The number of unknown
functions involved is reduced to merely four, as against five in other shear
deformation theories. The variationally consistent theory presented here
has, in many respects, strong similarity to the classical plate theory. It
does not require shear correction factors, and gives rise to such transverse
shear stress variation that the transverse shear st...
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| Delayed feedback control experiments on some flexible structures |
| Cai Guo-Ping Chen Long-Xiang |
| Abstract |
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In recent decades, studies on delayed system dynamics have attracted
increasing attention and advances have been achieved in stability,
nonlinearity, delay identification, delay elimination and application.
However, most of the existing work is on the theoretical basis and little is
on the experiment. This paper presents our experimental studies on delayed
feedback control conducted in recent years with the focus on the discussion
of a DSP-based delayed experiment system. Some phenomena in...
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| Analytical and experimental studies on nonlinear characteristics of an L-shape beam structure |
| Cao Dong-Xing Zhang Wei Yao Ming-Hui |
| Abstract |
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This paper focuses on theoretical and experimental
investigations of planar nonlinear vibrations and chaotic dynamics
of an L-shape beam structure subjected to fundamental harmonic
excitation, which is composed of two beams with right-angled
L-shape. The ordinary differential governing equation of motion
for the L-shape beam structure with two-degree-of-freedom is
firstly derived by applying the substructure synthesis method and
the Lagrangian equation. Then, the method of multiple scales...
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| Compressive deformation of ultralong amyloid fibrils |
| Raffaella Paparcone Steven Cranford Markus J. Buehler |
| Abstract |
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Involved in various neurodegenerative diseases, amyloids fibrils and plaques feature a hierarchical structure, ranging from
the atomistic to the micrometer scale. At the atomistic level, a
dense and organized H-bonds network is resembled in a beta-sheet
rich secondary structure, which drives a remarkable stiffness in
the range of 10--20 GPa, larger than many other biological
nanofibrils, a result confirmed by both experiment and theory.
However, the understanding of how these exceptional m...
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