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2011 Vol. 41, No. 5

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Fourty years of Advances in Mechanics
Bai Yilong
2011, 41(5): 479-479. doi: 10.6052/1000-0992-2011-5-lxjzJ2011-135
Abstract(1713) PDF(590)
Abstract:
Compressive-shear behavior and self-sharpening of bulk metallic glasses and their composite materials
Li Jicheng, Chen Xiaowei
2011, 41(5): 480-518. doi: 10.6052/1000-0992-2011-5-lxjzJ2011-056
Abstract(2904) PDF(730)
Abstract:
For their excellent mechanical, physical and chemic performance, metallic glasses and their composite materials is becoming as an active research focus now. Especially, metallic glass matrix composite may be employed as the material of kinetic enrgy penetrator for its intense shear banding sensitivity. The present paper introduces the research advance up-to-date on the compressive shear characteristics and self-sharpening behavior of metallic glasses and their composite materials during the high-speed impact. The related experimental research, theoretical analysis and FEM simulations are reviewed, and also some future research proposals are made.
REVIEW OF THE LEAKAGE FLOW AND ROTORDYNAMIC CHARACTERISTICS OF POCKET DAMPER SEALS
Li Jun, Li Zhigang
2011, 41(5): 519-536. doi: 10.6052/1000-0992-2011-5-lxjzJ2011-028
Abstract(1993) PDF(544)
Abstract:
Since pocket damper seals can efficiently weaken the circumferential velocity of the leakage flow, they endow rotors with excellent dynamic characteristics, as illustrated here. The research and development of pocket damper seals is presented at first. Investigations on the leakage flow and rotordynamic characteristics of pocket damper seals using theoretical analysis, experimental measurements and numerical predictions are detailed summarized. Two kinds of experimental methods, i.e. system impedance method and cavity dynamic pressure response method, for the measurement of rotordynamic characteristics of pocket damper seals are elucidated as well as their applications. Finally, the research and development of pocket damper seals for advanced turbomachinery design are briefly outlined.
Advances in full time-history prediction and active control of blasting vibration
Li Peng, Lu Wenbo, Chen Ming
2011, 41(5): 537-546. doi: 10.6052/1000-0992-2011-5-lxjzJ2010-087
Abstract(1969) PDF(999)
Abstract:
Blasting vibration is the main part of blast pollution and should be controlled in engineering. Blasting vibration control technique based on full time-history prediction of blasting vibration is an active way to control the vibration and has a good prospect in application. In this paper the development and application of the blasting vibration full time-history prediction are discussed and 他the advantages and disadvantages of different prediction models are compared. The theoretical study, experimental research and engineering application of the two typical active control techniques, i.e. vibration reduction method applying waveform interference and spectral control method, are introduced. And the advantages and some application examples of blasting vibration control under electronic initiating condition are described in detail. The problems in need of further studies are pointed out at the end of the paper.
ADVANCES IN THE RESEARCH ON UNSTRUCTURED MESH DEFORMATION
Zhou Xuan, Li Shuixiang, Sun Shuli, Liu Jianfei, Chen Bin
2011, 41(5): 547-561. doi: 10.6052/1000-0992-2011-5-lxjzJ2011-050
Abstract(2581) PDF(1769)
Abstract:
The unstructured mesh deformation in dynamic meshes is one of the key techniques in computational fluid dynamics and solid mechanics. This paper presents recent advances in the researches on unstructured mesh deformation, and makes a detailed classification of mesh deformation approaches. The existing mesh deformation methods are classified into pseudo-structural approach, partial differential equation and algebraic method. The advances and properties of main approaches of mesh deformation are summarized. The main research fields including mesh deformation, dynamic mesh generation with complex boundary under irregular deformations, dynamic mesh generation in 3D, parallel dynamic mesh generation and moving grids technique, are discussed in details. The trends of mesh deformation investigations are briefly presented as well.
On the achievements and prospects for the methods of computational fluid dynamics
Yan Chao, Yu Jian, Xu Jinglei, Fan Jingjing, Gao Duanze
2011, 41(5): 562-589. doi: 10.6052/1000-0992-2011-5-lxjzJ2010-082
Abstract(7165) PDF(5581)
Abstract:

The achievements of CFD are summarized, especially on computational gasdynamics. The developments on numerical schemes, grid techniques, turbulence modeling, large eddy simulation are addressed. Also, problems as well as development trends in the above aspects are analyzed separately.
THE SUPPORTED PROJECTS ON MECHANICS OF NSFC IN 2011
Zhan Shige, Zhang Panfeng, Lu Shouqin, Zhang Wenming
2011, 41(5): 590-614. doi: 10.6052/1000-0992-2011-5-lxjzJ2011-126
Abstract(2423) PDF(2533)
Abstract:
ADVANCES IN HETEROGENEOUS MATERIAL MECHANICS: CUTTING-EDGE AND GROWING POINTS ------ OBSERVATION AND INSPIRATION FROM ICHMM2008
Fan Jinghong, Chen Haibo
2011, 41(5): 615-636. doi: 10.6052/1000-0992-2011-5-lxjzJ2010-109
Abstract(2452) PDF(2562)
Abstract:
This paper is a systematic review of the cutting-edge and growing points of the heterogeneous material mechanics. It includes not only the contents of presentations and discussions of the six special workshops held in the ICHMM-2008, but also includes the focuses of recent researches and their new achievements. Specifically, this paper discusses advances in the following aspects: Multiple physics and multiscale modeling, atomistic to continuum analyses of material structure and behavior, stochastic microstructure evolution and degradation, modeling of realistic microstructure, biological and nature-inspired material design, in situ experiments and model validation, mechanics of functional gradient materials, and the development of micron-nano devices and systems. Among them, the topic of multiple physics and multiscale modeling is paid much attention, including its background, objectives, needs, advantages and disadvantages of the existent methods, obstacles for its development, applications, intrinsic connections with other research areas, as well as illustration of the cutting-edge points and notable new developments.
THE 6TH INTERNATIONAL CONFERENCE\\ ON FLUID MECHANICS
Jiachun Li, Fu song, Zan Jiemin
2011, 41(5): 637-638. doi: 10.6052/1000-0992-2011-5-lxjzJ2011-132
Abstract(2278) PDF(939)
Abstract:

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