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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Structural Engineering and Mechanics
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Volume 4, Issue 6 - Nov 1996
Volume 4, Issue 5 - Sep 1996
Volume 4, Issue 4 - Jul 1996
Volume 4, Issue 3 - May 1996
Volume 4, Issue 2 - Mar 1996
Volume 4, Issue 1 - Jan 1996
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On a new fourth order self-adaptive time integration algorithm
Zhong, Wanxie ; Zhu, Jianping ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 589~600
DOI : 10.12989/sem.1922.214.171.1249
An explicit 4th order time integration scheme for solving the convection-diffusion equation is discussed in this paper. A system of ordinary differential equations are derived first by discretizing the spatial derivatives of the relevant PDE using the finite difference method. The integration of the ODEs is then carried out using a 4th order scheme and a self-adaptive technique based on the spatial grid spacing. For a non-uniform spatial grid, different time step sizes are used for the integration of the ODEs defined at different spatial points, which improves the computational efficiency significantly. A numerical example is also discussed in the paper to demonstrate the implementation and effectiveness of the method.
A simple procedure to simulate the failure evolution
Chen, Zhen ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 601~612
DOI : 10.12989/sem.19126.96.36.1991
To simulate the large-scale failure evolution with current computational facilities, a simple approach, that catches the essential feature of failure mechanisms, must be available so that the routine use of failure analysis is feasible. Based on the previous research results, a simple analysis procedure is described in this paper for failure simulation. In this procedure, the evolution of localization is represented by a moving surface of discontinuity, and the transition between continuous and discontinuous failure modes are described via the moving jump forms of conservation laws. As a result, local plasticity and damage models, that are formulated based on thermodynamic restrictions, are still valid without invoking higher order terms, and simple integration schemes can be designed for the rate forms of constitutive models. To resolve localized large deformations and subsequent cracking, an efficient structural solution scheme is given for Static and dynamic problems.
Use of homogenization theory to build a beam element with thermo-mechanical microscale properties
Schrefler, B.A. ; Lefik, M. ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 613~630
DOI : 10.12989/sem.19188.8.131.523
The homogenization method is used to develop a beam element in space for thermo-mechanical analysis of unidirectional composites. Local stress and temperature field in the microscale are described using the function of homogenization. The global (macroscopic) behaviour of the structure is supposed to be that of a beam. Beam-type kinematical hypotheses (including independent shear rotations) are hence applied and superposed on the microdescription. A macroscopic stiffness matrix for such a beam element is then developed which contains the microscale properties of the single cell of periodicity. The presented model enables us to analyse without too much computational effort complicated composite structures such as e.g. toroidal coils of a fusion reactor. We need only a FE mesh sufficiently fine for a correct description of the local geometry of a single cell and a few of the newly developed elements for the description of the global behaviour. An unsmearing procedure gives the stress and temperature field in the different materials of a single cell.
Micro/macro properties of geomaterials: a homogenization method for viscoelastic problem
Ichikawa, Yasuaki ; Wang, Jianguo ; Jeong, Gyo-Cheol ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 631~644
DOI : 10.12989/sem.19184.108.40.2061
Geomaterials such as soil and rock are composed of discrete elements of microstructures with different grains and microcracks. The studies of these microstructures are of increasing interest in geophysics and geotechnical engineering relating to underground space development We first show experimental results undertaken for direct observation of microcrack initiation and propagation by using a newly developed experimental system, and next a homogenization method for treating a viscoelastic behavior of a polycrystalline rock.
Modelling of strain localization in a large strain context
Cescotto, S. ; Li, X.K. ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 645~653
DOI : 10.12989/sem.19220.127.116.115
In order to avoid pathological mesh dependency in finite element modelling of strain localization, an isotropic elasto-plastic model with a yield function depending on the Laplacian of the equivalent plastic strain is implemented in a 4-node quadrilateral finite element with one integration point based on a mixed formulation derived from Hu-Washizu principle. The evaluation of the Laplacian is based on a least square polynomial approximation of the equivalent plastic strain around each integration point. This non local approach allows to satisfy exactly the consistency condition at each integration point. Some examples are treated to illustrate the effectiveness of the method.
Non-conventional formulations for the finite element method
de Freitas, J.A. Teixeira ; de Almeida, J.P. Moitinho ; Peraira, E.M.B. Ribeiro ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 655~678
DOI : 10.12989/sem.1918.104.22.1685
The paper reports on alternative hybrid/mixed formulations being developed by the Structural Analysis Research Group of Institute Superior T
cnico. These formulations open the scope and increase the power of the finite element method by allowing different fields to be independently approximated, within certain consistency criteria, and by enhancing the use of a wide range of approximation functions. They have been applied to the analysis of 2-D problems, laminar structures and solids, using different constitutive relations, both in quasi-static and dynamic regimes. The fundamental properties of the formulations are identified and assessed and their performance is illustrated using simple, linear applications.
Numerical analysis of plasma-sprayed ceramic coatings for high-temperature applications
St. Doltsinis, Ioannis ; Haller, Kai-Uwe ; Handel, Rainer ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 679~702
DOI : 10.12989/sem.1922.214.171.1249
The finite element method is employed in conjunction with micromechanical modelling in order to assess the performance of ceramic thermal barrier coatings applied to structural components. The study comprises the conditions of the deposition of the coating by plasma spraying as well as the thermal cycling of the coated component, and it addresses particularly turbine blades. They are exposed to high temperature changes strongly influencing the behaviour of the core material and inducing damage in the ceramic material by intense straining. A concept of failure analysis is discussed starting from distributed microcracking in the ceramic material, progressing to the formation of macroscopic crack patterns and examining their potential for propagation across the coating. The theory is in good agreement with experimental observations, and may therefore be utilized in proposing improvements for a delayed initiation of failure, thus increasing the lifetime of components with ceramic thermal barrier coatings.
Stochastic finite element analysis of plate structures by weighted integral method
Choi, Chang-Koon ; Noh, Hyuk-Chun ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 703~715
DOI : 10.12989/sem.19126.96.36.1993
In stochastic analysis, the randomness of the structural parameters is taken into consideration and the response variability is obtained in addition to the conventional (mean) response. In the present paper the structural response variability of plate structure is calculated using the weighted integral method and is compared with the results obtained by different methods. The stochastic field is assumed to be normally distributed and to have the homogeneity. The decomposition of strain-displacement matrix enabled us to extend the formulation to the stochastic analysis with the quadratic elements in the weighted integral method. A new auto-correlation function is derived considering the uncertainty of plate thickness. The results obtained in the numerical examples by two different methods, i.e., weighted integral method and Monte Carlo simulation, are in a close agreement. In the case of the variable plate thickness, the obtained results are in good agreement with those of Lawrence and Monte Carlo simulation.
CAD for process innovation in the construction industry
Feijo, Bruno ; Gomes, Paulo C. Rodacki ; Bento, Joao ; Scheer, Sergio ;
Structural Engineering and Mechanics, volume 4, issue 6, 1996, Pages 717~729
DOI : 10.12989/sem.19188.8.131.527
This paper presents the concepts of Process Innovation and Concurrent Engineering in view of their use within Integrated CAD Systems. It follows by proposing process models that support an effective implementation. The work is practically founded on the authors' experience in performing the initial steps of implementation of some of such integrated systems for the construction industry.