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1994 Vol. 24, No. 1

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THERMOMECHANICS OF AEROSPACE STRUCTURES──Tasks and Applications
1994, 24(1): 1-23. doi: 10.6052/1000-0992-1994-1-J1994-001
Abstract(1654) PDF(982)
Abstract:
The background and tasks of thermomechanics of aerospace structures are presented. First its prerequistes are discussed:load spectra and materialCharacteristics.Then some typical structural concepts are introduced,such as:heat protection system during entry, orbital structure, and the use of carbonfiberreinforced polymers in airplanes. From these concepts the tasks of thermome-chanics of aerospace structures are deduced: thermal analysis, structural analysis,thermo- damage mechanics, thermomechanical c...
NEW SUBjECTS ON THE INTERSECTION OF SOLID MECHANICS AND MATERIAL SCIENCES
1994, 24(1): 24-36. doi: 10.6052/1000-0992-1994-1-J1994-002
Abstract(1668) PDF(1544)
Abstract:
The interscction between mechanics and material sciences is a new trend of the development of mechanics at the present time.Accompanying the rescarch and devclopment of advanced materials, the interests have been strongly shown by the experts working in the field of solid mechanics in the quantitative description for the process of the deformation and the damage of various micro-structures of the materials. In this paper, three new subjects on the intersection of solid mechanics and material scicnces ar...
NUMERICAL SIMULATION OF EXPLOSIVE COMPACTION OF POWDER
1994, 24(1): 37-58. doi: 10.6052/1000-0992-1994-1-J1994-003
Abstract(1662) PDF(1004)
Abstract:
The numerical simulation of explosive compaetion of powder has beensystematically reviewed in this paper,The model equations and computationalmethods of the motion of Hydro-Elasto-plastic body are described together withsome typical computer codes.Recent progresses on the numerical simulation ofpowder explosive compaction are summarized. Finally some suggestions for futuredevelopment trend are put forward.
THE RESEARCH ON PLPE SYSTEMS CONVEYING FLUID ──PROGRESS AND TENDENCY
1994, 24(1): 59-65. doi: 10.6052/1000-0992-1994-1-J1994-004
Abstract(1650) PDF(991)
Abstract:
The present paper gives a historical summary of the mechanical model,loads of different kind,the practical background and calculating methods ondynamics and stability of pipe systems containing flowing fluid. And the researchtendency is discussed.
Discussion on the Concepts of Two-Phase Flow,Multiphase Flow,Multifluid Model and Non-Newtonian Flow
1994, 24(1): 66-74. doi: 10.6052/1000-0992-1994-1-J1994-005
Abstract(3666) PDF(1533)
Abstract:
The differences between the concepts of single-,two-and multi-phaseflow and the differences between the concepts of single-, two-and multi-fluidmodel have been studied in this paper.The first three concepts are defined ac-cording to the physical properties of the moving medium,while the second threeare based on the research methods used by authors. Now, there are some con-fusions in using these concepts,such as two-phase flow and multiphase flow,multiphase flow and multifluid model,and so on.The diffusion...
THE MWR OF MATHEMATICAL PROGRAMMING AND ITS ADVANCES
1994, 24(1): 75-87. doi: 10.6052/1000-0992-1994-1-J1994-006
Abstract(1894) PDF(904)
Abstract:
This paper presents a new method of weighted residuals called theMWR of mathematical programming,which is to seek the approximate solutionsof differential equations by the use of the mathematical programming and thebilateral inequality, as is different from other methods.By this method,it ispossible to find the upper bound and lower bound of the approximate solution.Moreover,this method possesses the advantage that the degree of accuracy ofthe approximate solutions may be controlled during the process of ca...
THE METHODS FOR SIMPLIFYING THE MODELOF DYNAMIC SYSTEMS
1994, 24(1): 88-97. doi: 10.6052/1000-0992-1994-1-J1994-007
Abstract(1869) PDF(1424)
Abstract:
This paper presents a review on the model simplifying methods inthe large scale system theory and computational structural dynamics. The rela-tions between them are analysed, and some ideas are given concerning the modelreduction for closed-loop systems and its applications to active controlling of thedynamic structure .
THE DEGENERATED SHELL FINITE ELEMENTS IN STRUCTURAL ANALYSIS
1994, 24(1): 98-105. doi: 10.6052/1000-0992-1994-1-J1994-008
Abstract(1644) PDF(983)
Abstract:
The current status and the development of the degenerated shell finiteelements are reviewed in the present article. First, flat plate shell finite ele-ments and curvcd shell finite elements based upon the shell theory are brieflyintroduced.Then single-variable(displacement type) degcnerated shell finiteelements are reviexved.Finally,multi-variable(hybrid, mixed, quasi-conformingand hybrid/mixed types)shell finite elements are discussed.
DESCRIPTION AND DISCUSSION ON BIFURCATION AND CHAOS IN EVOIUTION OF MICROCRACK
1994, 24(1): 106-116. doi: 10.6052/1000-0992-1994-1-J1994-009
Abstract(1827) PDF(1105)
Abstract:
The following aspects are studied in the present paper:①Conven-tional methods and their some disadvantages on the fractal dimension measure of fracture surfaces②A type of bifurcation and chaos, which is found to exist in the evolution of microcrack density in active growth areas when constant ampli-tude loading spectrum is applied,and a mathematical model for describing this phenomenon. ③The reasonable definition and cumulative rule.of fatigue damage as an indirect result of bifurcation and chaos.
CONSTITUTIVE RELATIONS FOR NUMERICAL ANALYSIS OF REINFORCED CONCRETE
1994, 24(1): 117-123. doi: 10.6052/1000-0992-1994-1-J1994-010
Abstract(2792) PDF(922)
Abstract:
In this paper several constitutive relations of reinforced concrete, in-cluding the constitutive models of concrete , reinforced bar and bond-slip betweenconcrete and steel bar are reviewed.In addition the future development in thisfield is discussed.
THE RESIDUAL STRAINS IN LIVING TISSUES
1994, 24(1): 124-131. doi: 10.6052/1000-0992-1994-1-J1994-011
Abstract(2104) PDF(1026)
Abstract:
This paper reviews the history and development of the research on residual strains in living tissues.The residual strains in heart and blood vessel are discussed in detail.It is concluded that the existencc of residual strains is a common feature for many living tissties.Residual stresses or risidual strains play very important roles in the meehanical behavior and the functions of organs,and in the tissue remodeling and morphogenesis of organs.
TREND ANALYSIS OF ROCK BLASTING TECHNIQUNE IFROM THE FOURTH INTERNATIONAL SYMPOSIUM ON ROCK FRAGMENTATION BY BLASTING
1994, 24(1): 132-134. doi: 10.6052/1000-0992-1994-1-J1994-012
Abstract(1354) PDF(1017)
Abstract:
This papar concisely describes the development trend of blasting technique.Emphasis is laid on introducing the Fourth International symposium on Rock Fragmentation by Blasting.
1994, 24(1): 135-140. doi: 10.6052/1000-0992-1994-1-J1994-013
Abstract(1245) PDF(633)
Abstract:
1994, 24(1): 141-142. doi: 10.6052/1000-0992-1994-1-J1994-014
Abstract(1327) PDF(735)
Abstract:

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