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2000 Vol. 30, No. 2

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MATHEMATICAL THEORY OF ELASTICITY AND DEFECTS OF QUASICRYSTALS
2000, 30(2): 161-174. doi: 10.6052/1000-0992-2000-2-J1998-014
Abstract(2569) PDF(996)
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This paper gives a review on the basic concepts and the basic frame of the theory of elasticity for quasicrystals, then, the theoretical system of the elasticity of some kinds of one-, two- and three-dimensional quasicrystals are discussed. To solve boundary value problems or initial-boundary value problems, the methodology of quasicrystal elasticity should be developed. Physicists used the Green function method in treating dislocation problems of quasicrystals. A decomposition and superposition procedure w...
ADVXNCES OF POSTERIORI ERROR ESTIMATION FOR FEM
2000, 30(2): 175-190. doi: 10.6052/1000-0992-2000-2-J1998-015
Abstract(2913) PDF(1285)
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There are two main types in finite element posterior error estimation, i.e. the residue and the postprocessing error estimation. The beginning, developments and recent advances of two types posterior error estimation are given in this paper in detail. Reviews is emphasis on the basis principle of ZZ error estimators and it's newly advances, some reviews on each method's advantages and disadvantages and future research is also given.
THE DEVELOPMENTS OF SPLINE FINITE ELEMENT METHOD IN COMPUTATIONAL MECHANICS
2000, 30(2): 191-199. doi: 10.6052/1000-0992-2000-2-J1998-016
Abstract(2032) PDF(2103)
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This paper reviews the developments of the spline finite element method based on the variational principle, the theory of spline function and the state space theory during the last twenty years. It includes the application of cut spline function in mechanics, as an early development, the advantages and disadvantages of spline finite element, spline finite point and spline element, the application of multivariable spline finite element method and spline state variable method in dynamic response.
ADVANCES IN PERTURBATION FINITE DIFFERENCE (PFD) METHOD
2000, 30(2): 200-215. doi: 10.6052/1000-0992-2000-2-J1998-017
Abstract(2147) PDF(845)
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In the perturbation finite difference (PFD) method both the differentials and non- differential terms in the differential equation studied are discretized. High accuracy and high resolution difference schemes are obtained with the differentials being approximated by the direct differences (i.e., second-order-accurate center difference and first-order-accurate upwind difference). PFD method includes the perturbation exact numerical solution (PENS) scheme for locally lin- earized differential equation and t...
THE PROGRESS ON COMPLETE EIGEN-SOLUTION OF TWO DIMENSIONAL NOTCH PROBLEMS
2000, 30(2): 216-226. doi: 10.6052/1000-0992-2000-2-J1998-018
Abstract(1625) PDF(905)
Abstract:
A brief review on eigen-solution of two-dimension crack/notch problems (anti-plane problem, in-plane problem, Reissuer plate) is given. A detailed introduction is given of the authors' work on complete eigen-solutions, including anti-plane problem, in-plane problem, Reissuer plate and shallow shell. In this paper, complete eigen-values salution method, characteristics of multiple roots and eigen-functions calculation are described. The present results offer a significant insight into the study of crack/notc...
PROGRESS IN THE STUDIES OF ENERGY ABSORPTION BEHMIOR OF TEXTILE COMPOSITES
2000, 30(2): 227-238. doi: 10.6052/1000-0992-2000-2-J1998-019
Abstract(1951) PDF(981)
Abstract:
The energy absorption behavior of textile composites has been an attractive research topic in recent years. In this paper, the current research status and development on the energy absorption behavior of textile composite are reviewed, with emphases on fiber architectures, fab- rication processes, energy absorbing capacity and failure modes under impact load, as well as experimental methods for the energy absorption behavior of textile composites.
REVIEW ON THE DYNAMIC BEHMIORS AND PENETRATION OF THE COMPOSITES HELMET UNDER IMPACT LOADING
2000, 30(2): 239-251. doi: 10.6052/1000-0992-2000-2-J1998-020
Abstract(2243) PDF(1380)
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The studies on energy absorption mechanisms and the penetration processes of the helmet made of fiber reinforced composites and impacted by the FSP or bullet are reviewed in this paper. The development of the numerical simulation for the penetration of helmet is also discussed.
ADVXNCES IN DYNAMIC SIMULATION OF STAMPING OF AUTOBODY MNEL
2000, 30(2): 252-271. doi: 10.6052/1000-0992-2000-2-J1998-021
Abstract(1911) PDF(965)
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In the paper the key technologies in the dynamic simulation of stamping of autobody panels, such as material model, finite element method, contact and friction, initial blank shape, and die and technical factors are summarized. The research advances in these technology fields are reviewd. The problems in the application and the tendency of development in the future are discussed.
ADVXNCES IN RESIDUAL STRESS ANAlySIS IN INJECTION MOLDING OF POLYMERS
2000, 30(2): 272-283. doi: 10.6052/1000-0992-2000-2-J1998-022
Abstract(2263) PDF(1756)
Abstract:
In this paper, both mathematical models and experimental measurements for residual stresses in injection-molded parts are reviewed. It is well-known that residual stresses have two sources, which are the main causes for deformation and warpage of plajstics. For flow residual stresses, viscoelastic constitutive models are used to analyze the development of stresses in the filling stage and the relaxation of stresses in the subsequent cooling stage. For thermal residual stresses, the application of thermovisc...
A SSTO ROCKET CONCEPT-AEROSPIKE NOZZLE ENGINE
2000, 30(2): 283-294. doi: 10.6052/1000-0992-2000-2-J1998-023
Abstract(3166) PDF(1196)
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This paper presents a comprehensive review of development of a propulsion system for the next generation reusable launch vehicle and introduces the SSTO rocket concept──aerospike nozzle engine, especially its background, state of the art conceptual analysis and prospective work in the future.
DYNAMIC INSTABILITIES IN MECHANICS OF STRUCTURES
2000, 30(2): 295-304. doi: 10.6052/1000-0992-2000-2-J1998-252
Abstract(2870) PDF(1314)
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In this retrospective, the author looks at the field of stability and postcritical behavior of structures for which analysis needs a dynamical approach. The following groups of dynamic instabilities are covered: 1) paxametrically excited vibrations; 2) response of structures to impact loading; 3) aero- and hydroelastic induced dynamic instabilities; 4) structural response to so-called follower forces; 5) instabilities of tubes conveying gas or fluid; 6) instabilities of rotors due to rotating friction and r...
2000, 30(2): 295-304. doi: 10.6052/1000-0992-2000-2-J2000-032
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2000, 30(2): 305-305. doi: 10.6052/1000-0992-2000-2-J1998-253
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2000, 30(2): 305-305. doi: 10.6052/1000-0992-2000-2-J2000-019
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2000, 30(2): 306-307. doi: 10.6052/1000-0992-2000-2-J1998-254
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2000, 30(2): 308-309. doi: 10.6052/1000-0992-2000-2-J1998-255
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2000, 30(2): 310-313. doi: 10.6052/1000-0992-2000-2-J1998-256
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2000, 30(2): 310-313. doi: 10.6052/1000-0992-2000-2-J2000-028
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2000, 30(2): 314-317. doi: 10.6052/1000-0992-2000-2-J1998-257
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2000, 30(2): 314-317. doi: 10.6052/1000-0992-2000-2-J2000-025
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