CMES-Vol. 9, No. 1, 2005

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ARTICLE

Coupled Analysis of Independently Modeled Finite Element Substructures by Moving Least Squares Displacement Welding Technique
Jin Yeon Cho¹, Jae Mo An², You Me Song¹, Seungsoo Lee¹, Dong Whan Choi¹
CMES-Computer Modeling in Engineering & Sciences, Vol.9, No.1, pp. 1-18, 2005, DOI:10.3970/cmes.2005.009.001
Abstract A displacement welding technique is proposed to carry out coupled analysis of the integrated whole model which consists of independently modeled finite element substructures. In the proposed method, the incompatible displacement fields in the interfaces of independently modeled substructures are directly welded together through a blended function that is newly defined in the transient region of mismatching interface. To construct the blended function, the moving least squares function, which does not require well-defined nodal connectivity, is utilized along with the original finite element shape function. The meshless character of the moving least squares function makes More >

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A Local Strictly Nondecreasing Material Law for Modeling Softening and Size-Effect: a Discrete Approach
E. Ferretti¹
CMES-Computer Modeling in Engineering & Sciences, Vol.9, No.1, pp. 19-48, 2005, DOI:10.3970/cmes.2005.009.019
Abstract In this study nonlocality is discussed with regard to the differential and discrete formulations. Here, nonlocality is found to be a concept attaining not to the description of the material, but to the governing equations. This has made it possible to discuss the opportunity of introducing nonlocality in the constitutive equations, in order to give respectability to strain-softening damage models. When using the differential formulation, a length scale must be introduced into the material description of a strain-softening modeling, particularly when the size-effect is involved. In the opinion of the Author, this need lies in… More >

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Elastic waves in a hybrid multilayered piezoelectric plate
X. Han¹, H. Ding^∗2, G. R. Liu¹
CMES-Computer Modeling in Engineering & Sciences, Vol.9, No.1, pp. 49-56, 2005, DOI:10.3970/cmes.2005.009.049
Abstract An analytical-numerical method is presented for analyzing dispersion and characteristic surface of waves in a hybrid multilayered piezoelectric plate. In this method, the multilayered piezoelectric plate is divided into a number of layered elements with three-nodal-lines in the wall thickness, the coupling between the elastic field and the electric field is considered in each element. The associated frequency dispersion equation is developed and the phase velocity and slowness, as well as the group velocity and slowness are established in terms of the Rayleigh quotient. Six characteristic wave surfaces are introduced to visualize the effects of More >

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Numerical Modeling of the Influence of Water Suction on the Formation of Strain Localization in Saturated Sand
X. Liu, A. Scarpas¹
CMES-Computer Modeling in Engineering & Sciences, Vol.9, No.1, pp. 57-74, 2005, DOI:10.3970/cmes.2005.009.057
Abstract Numerical investigations of strain localization have been performed on 3D dense fully saturated sand specimens subjected to triaxial loading and simultaneous inflow or outflow conditions. The role of the water suction field on the formation and evolution of strain localization is addressed computationally. It has been shown that, in a porous medium, the fluid (water) phase plays indeed an important role in strain localization. The formation and evolution of strain localization are influenced both by the material behaviour of the solid component and the interaction between components. In this contribution, after a presentation of the More >

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Molecular-dynamics Study on Crack Growth Behavior Relevant to Crystal Nucleation in Amorphous Metal
R. Matsumoto¹, M. Nakagaki¹, A. Nakatani², H. Kitagawa³
CMES-Computer Modeling in Engineering & Sciences, Vol.9, No.1, pp. 75-84, 2005, DOI:10.3970/cmes.2005.009.075
Abstract In this paper, the internal structure-changes around the crack-tip and the pertinent crack growth behavior in an amorphous metal were studied by a molecular dynamics (MD) simulation. In order to perform a large scale calculation, the domain decomposition method was used for parallel calculation. The Finnis-Sinclair potential for$\alpha$-iron was used to describe the interatomic potential. Computed results show that nano-scaled crystalline phase grows around the crack-tip. The distribution of deformation zones and deformation mechanism are significantly altered. While grains are relatively small, they are not deformed, and the most amorphous-crystal interfaces have a large strain More >

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On the Indentation of a Chemically-treated Polymeric Membrane
A. P. S. Selvadurai¹, Q. Yu²
CMES-Computer Modeling in Engineering & Sciences, Vol.9, No.1, pp. 85-110, 2005, DOI:10.3970/cmes.2005.009.085
Abstract A characteristic feature of a polymeric material such as PVC is its hyperelasticity or the ability to experience large strains prior to failure. The exposure of PVC to chemicals such as acetone and ethanol results in embrittlement or the loss of the hyperelasticity property. In this paper, we examine the mechanical behaviour of a PVC membrane that has been exposed to ethanol. Due to leaching of the plasticizer, the constitutive response of the PVC changes from a hyperelastic material to a hardened material that displays dominant yield behaviour and particularly one that is capable of… More >

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