力学进展

HIERARCHICAL STRUCTURES AND SCALINGS IN TURBULENCE

1999, 29(3): 289-303. doi: 10.6052/1000-0992-1999-3-J1998-084

Abstract(2735)

PDF(1592)

Abstract:
Turbulence is composed of hierarchical structures of various scales, various amplitude and various degree of coherence. At all length scales ranging from the integral scale to the dissipation scale, there exist the so-called most intermittent structures, which have the largest amplitudes and the strongest coherence. Structures of smaller amplitude airs related to the most intermittent structures according to a certain symmetry relation. This is the so-called Hierarchical Structures model of turbulence(She ...

DEVELOPMENT OF METHODOLOGY FOR PREDICTING FATIGUE LIFE OF FIBER REINFORCED METAL LAMINATES

1999, 29(3): 304-316. doi: 10.6052/1000-0992-1999-3-J1998-085

Abstract(1617)

PDF(1139)

Abstract:
The paper presents a review of the characteristics of a new group of aircraft materials,the fiber reinforced metal laminates (FRMLs), the mechanism of fatigue damage, and the industrial application. Several important issues, including the bridging stress, the delamination growth and the prediction of the fatigue crack growth rates and the fatigue life, were addressed and summarized. Some suggestions on the prediction of fatigue life were proposed.

CORRESPONDENCE PRINCIPLES AND NUMERICAL METHODS OF INVERSE INTEGRAL TRANSFORMATION IN VISCOELASTIC MECHANICS

1999, 29(3): 317-330. doi: 10.6052/1000-0992-1999-3-J1998-086

Abstract(2362)

PDF(1333)

Abstract:
Integral transformation method is an important mathematical tool, when dealing with viscoelastic mixed boundary problems. By using integral transformation method, viscoelastic mixed boundary problems can be made to correspond with elastic mixed boundary problems,which is the well-known correspondence principle. Then, the methods used for elastic mixed boundary problems, and the inverse integral transformation method may be employed to solve viscoelastic mixed boundary problems in time domain. This paper giv...

ON WAVE-CURRENT INTERACTION

1999, 29(3): 331-343. doi: 10.6052/1000-0992-1999-3-lxjzJ1998-087

Abstract(2001)

PDF(15)

Abstract:

Wave-current interaction is a frontier subject in nonlinear sciences, and has found varieties of important engineering applications. The effects of wave-current interaction on wave kinematics, hydrodynamic loading and boundary layer are reviewed in this paper.

RECENT PROGRESS IN MULTI-BLOCK GRID GENERATION

1999, 29(3): 344-368. doi: 10.6052/1000-0992-1999-3-J1998-088

Abstract(2456)

PDF(1576)

Abstract:
Grid generation is an essential part of computational fluid dynamics, and multi-block structured grid is the most widely used grid type. Combined with a discussion of the criteria for evaluation of grid generation systems, this paper reviews recent developments in multi-block grid generation with emphases on grid topology and grid block patching techniques, grid generation strategy for complete aircraft configurations, automatic blocking and the corresponding block merging methods, geometric data exchange ...

A REVIEW OF TWO-PHASE GAS-LIQUID FLOW PATTERNS UNDER MICROGRMITY CONDITIONS

1999, 29(3): 369-382. doi: 10.6052/1000-0992-1999-3-J1998-089

Abstract(1592)

PDF(1129)

Abstract:
Two-phase gas-liquid flow is important for both scientific research and engineering application. The study of flow pattern is one of the most basic topics in this area. It is, however, an unfortunate fact that there isn't a generally recognized theory for flow pattern transition prediction because of its complexity at normal gravity. In microgratvity environment due to the absence of gralvity the dynamical interaction between different factors in the flow will be simplified and then flow patterns will becom...

SCALING OF STRuCTURAL FAILURE

1999, 29(3): 383-433. doi: 10.6052/1000-0992-1999-3-J1998-090

Abstract(1979)

PDF(1182)

Abstract:
This article attempts to review the progress achieved in the understanding of scaling and size effect in the failure of structures. Particular emphasis is placed on quasibrittle materials for which the size effect is important and complicated. After reflections on the long history of size effectstudies, attention is focused on three main types of size effects, namely the statistical size effect due to randomness of strength, the energy release size effect, and the possible size effect due to fractality of f...

ADVANCES IN MECHANICS

1999, 29(3): 434-436. doi: 10.6052/1000-0992-1999-3-J1998-091

Abstract(2961)

PDF(656)

Abstract:

ADVANCES IN MECHANICS

1999, 29(3): 437-440. doi: 10.6052/1000-0992-1999-3-J1998-092

Abstract(1121)

PDF(770)

Abstract:

ADVANCES IN MECHANICS

1999, 29(3): 441-444. doi: 10.6052/1000-0992-1999-3-J1998-093