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1993 Vol. 23, No. 3

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THE DISCOVERY OF BAMBOO BOUNDARY INTERNAL FRICTION PEAK AND THE STUDY OF ITS MECHANISM
1993, 23(3): 289-301. doi: 10.6052/1000-0992-1993-3-J1993-028
Abstract(1913) PDF(820)
Abstract:
In the eighties, an internal friction peak situated below the peak temperature of the grain boundary peak of fine-grained specimens (the Ke peak) was observed in high-purity aluminium consisting of bamboo crystals. This discovery has given rise to much controversy and it was thought by some scientists both at home and abroad that this peak is only the Ke peak shifted toward lower temperature and is not a new peak.Our recent systematic study shows that the behavior of this peak is quite different from that o...
ADVANCES IN DISLOCATION PATTERNS FORMATION
1993, 23(3): 302-317. doi: 10.6052/1000-0992-1993-3-J1993-029
Abstract(2034) PDF(704)
Abstract:
A comprehensive survey of recent advances in dislocation pattern dynamics, including their experimental (TEM) observation, modelling of nonlinear dynamics, and dynamic simulation by super-computer, is presented in this -paper The future research trends arc also outlined
NONLINEAR MECHANICS AND COMPUTATION
1993, 23(3): 318-326. doi: 10.6052/1000-0992-1993-3-J1993-030
Abstract(2223) PDF(675)
Abstract:
The roles played by computation in the research of nonlinear mechanics arc elucidated in the present paper. Then, the mathematical aspects in the computation of nonlinear mechanics problems and some frontier topics in this field are analyzed. In addition, we have explored the ways to make full use of capabilities and resources of the computer.
MODERN MATHEMATICAL METHODS IN MODERN MECHANICS
1993, 23(3): 327-335. doi: 10.6052/1000-0992-1993-3-J1993-031
Abstract(2096) PDF(686)
Abstract:
This paper outlines the tendency of connection between mechanics and mathematics, its historical background and the present -state. According to the problems that the modern science and technology put before mechanics, we have briefly reviewed the domain of the modern mathematics and methods related to the modern mechanics.
OPTIMAL DISCRETIZATION IN FINITE ELEMENT ANALYSIS
1993, 23(3): 336-347. doi: 10.6052/1000-0992-1993-3-J1993-032
Abstract(2192) PDF(1158)
Abstract:
Optimization of finite element grids based on the minimum potential energy is important both in theory and practice. By means of this method, the most accurate numerical results can be obtained with the least degrees of freedom. In this paper, two kinds of procedures are presented as typical adaptive processes in grid optimization.A series of examples including some research work by Dr. JVC. Zhu, Dr. Y.C.Liu and the author under the guidance of Prof. Zienkiewicz: are given to show the validity and versatili...
LAGRANGIAN ANALYSIS AND ITS RECENT DEVELOPMENTS
1993, 23(3): 348-359. doi: 10.6052/1000-0992-1993-3-J1993-033
Abstract(2134) PDF(656)
Abstract:
Lagrahgian analysis was first presented by Fowles et al in the early 70's and found important applications in data processing for dynamic experiments. However, the practice reveals that it sometimes leads to unreliable results. Recent years see rapid developments in this field. New ideas,methods and improvements are suggested, such as impulse time integral function, surface fit-ting, inverse method and selfrconsistency examination etc. Particularly, some remarkable progress has been made in the study of the...
ON SYMMETRY AND INVARIANT OF DYNAMICAL SYSTEMS
1993, 23(3): 360-372. doi: 10.6052/1000-0992-1993-3-J1993-034
Abstract(2125) PDF(1066)
Abstract:
In this paper, we review the research results published in recent ten years on symmetry and invariant of dynamical systems, including generalized Noether symmetries, higher-order Noether symmetries, Lie symmetries, pseudo-symmetries and adjoint symmetries. We also present here for the first time our research results on higher-order Noether symmetries and Lic symmetries for nonconscrvative dynamical systems.
THE NON-EQUILIBRIUM GLASS TRANSITION OF POLYMERS AND ITS RELATED RHEOLOGICAL BEHAVIOR
1993, 23(3): 373-386. doi: 10.6052/1000-0992-1993-3-J1993-035
Abstract(1464) PDF(572)
Abstract:
Polymeric, glass, forming materials demonstrate , distinctly different physical, mechanical and rheological properties through glass transition and undergo continuous relaxation in glass state. The relevant classical theories are overviewed. A three dimensional mathematical representatipn (PVT/PST) by joint consideration of thermodynamics, statistical mechanics and kinetics is proposed, which proves most versatile in this area at present.
FLEXIBLE COMPOSITES AND THEIR APPLICATIONS
1993, 23(3): 386-397. doi: 10.6052/1000-0992-1993-3-J1993-036
Abstract(4002) PDF(1347)
Abstract:
This article focuses on recent researches in flexible composites, which allow large deformation and exhibit nonlinear elastic behaviour. The analytical approaches are based on the classical laminate theory and nonlinear elastic mechanics. Among flexible composites are cord/rubber composites, coated fabrics and composites containing wavy fibers.
PLASTIC INSTABILITY IN METAL FORMING PROCESS
1993, 23(3): 398-406. doi: 10.6052/1000-0992-1993-3-J1993-037
Abstract(2634) PDF(716)
Abstract:
Recent progress and unsettled problems concerning the plastic instability (shear band, necking, wrinkling) in metal forming processes are reviewed in this paper. The close relation between the prediction of plastic instability and the choice of constitutive laws is emphasized. It is pointed out that the predicted results strongly depend on the assumed constitutive laws. The effects of anisotropy, strain rate sensitivity, imperfection and its amplitude and inertia on plastic instability are discussed. Beside...
ON THE RESEARCH DEVELOPMENTS ON LOCALOVERALL INTERACTIVE BUCKLING OF THINWALLED PLATE STRUCTURES
1993, 23(3): 407-414. doi: 10.6052/1000-0992-1993-3-J1993-038
Abstract(2021) PDF(1012)
Abstract:
It becomes an urgent problem to study the load carrying capacity of thin-walled plate structures with respect to buckling. The interaction between the local buckling and the overall buckling is considered. The paper reviews some important theoretical developments on local-overall interactive buckling of thin-walled structures. Some remarks arc made on its further studies.
THE ADVANCE OF IRRIGATION TECHNIQUES——MICRO-IRRIGATION
1993, 23(3): 415-423. doi: 10.6052/1000-0992-1993-3-J1993-039
Abstract(1670) PDF(890)
Abstract:
The appearance and the application pf micro-irrigation signal a great advance of irrigation techniques. It is one of the best irrigation techniques of water-utilization efficiency in all modern irrigation methods. This paper describes the development and features of irrigation techniques, the form and the equipment function and the form of micro-irrigation system, and the hydraulics problems. The main problems and the application prospect in Chinese micro-irrigation techniques are presented.
ADVANCES AND TRENDS OF STUDIES ON STABILITY OF MOTION
1993, 23(3): 424-430. doi: 10.6052/1000-0992-1993-3-J1993-040
Abstract(1846) PDF(710)
Abstract:
In this paper the advances and trends of studies on stability of motion are reviewed in the field of mechanics system, control system, large-scale system, shock system, indeterminate system etc.
周崇芝
1993, 23(3): 431-431. doi: 10.6052/1000-0992-1993-3-J1993-041
Abstract(1741) PDF(1026)
Abstract:

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