Acta Mechanica Sinica
     Acta Mechanica Sinica
  Acta Mechanica Sinica--2010, 26 (6)   Published: 25 December 2010
Twenty-five years of excellence: a retrospective glance of Acta Mechanica Sinica
Cheng Geng-Dong
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...
Direct numerical simulation of compressible turbulent flows
Li Xin-Liang Fu De-Xun Ma Yan-Wen Liang Xian
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...
Recent development in structural design and optimization
Guo Xu Cheng Geng-Dong
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...
Mechanics of advanced fiber reinforced lattice composites
Fan Hua-Lin Zeng Tao Fang Daining Yang Wei
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...
On the behaviour characterisation of metallic cellular materials under impact loading
Fang Daining Li Yu-Long Zhao Han
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...
New perspective in statistical modeling of wall-bounded turbulence
She Zhen-Su Chen Xi Wu You Fazle Hussain
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...
Research papers
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
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...
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
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...
Transformation method and wave control
Chang Zheng Hu Jin Hu Geng-Kai
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...
Extended multiscale finite element method for mechanical analysis of heterogeneous materials
Zhang Hong-Wu Wu Jingkai Lv Jun Fu Zhen-Dong
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...
Interaction forces between soft magnetic particles in uniform and non-uniform magnetic fields
Ayyoub Mehdizadeh Renwei Mei James F. Klausner Nima Rahmatian
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...
Structural bonding-breakage constitutive model for natural unsaturated clayey soils
Cai Quo-Qing Zhao Cheng-Gang Qin Xiao-Ming
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...
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
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...
Delayed feedback control experiments on some flexible structures
Cai Guo-Ping Chen Long-Xiang
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...
Analytical and experimental studies on nonlinear characteristics of an L-shape beam structure
Cao Dong-Xing Zhang Wei Yao Ming-Hui
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...
Compressive deformation of ultralong amyloid fibrils
Raffaella Paparcone Steven Cranford Markus J. Buehler
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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