G.I. Giannopoulos¹, S.K. Georgantzinos², D.E. Katsareas², N.K. Anifantis²

CMES-Computer Modeling in Engineering & Sciences, Vol.56, No.3, pp. 231-248, 2010, DOI:10.3970/cmes.2010.056.231

Abstract A hybrid finite element formulation, combining nanoscopic and macroscopic considerations is proposed, for the prediction of the elastic mechanical properties of single walled carbon nanotube (SWCNT)-based composites. The nanotubes are modeled according to the molecular mechanics theory via the use of spring elements, while the matrix is modeled as a continuum medium. A new formulation concerning the load transfer between the nanotubes and matrix is proposed. The interactions between the two phases are implemented by utilizing appropriate stiffness variations describing a heterogeneous interfacial region. A periodic distribution and orientation of the SWCNTs is considered. Thereupon, More >

Dalin Tang¹, Chun Yang^1,2, Tal Geva^3,4, Glenn Gaudette⁴, and Pedro J. del Nido⁵

CMES-Computer Modeling in Engineering & Sciences, Vol.56, No.2, pp. 113-130, 2010, DOI:10.3970/cmes.2010.056.113

Abstract Right and left ventricle (RV/LV) combination models with three different patch materials (Dacron scaffold, treated pericardium, and contracting myocardium), two-layer construction, fiber orientation, and active anisotropic material properties were introduced to evaluate the effects of patch materials on RV function. A material-stiffening approach was used to model active heart contraction. Cardiac magnetic resonance (CMR) imaging was performed to acquire patient-specific ventricular geometries and cardiac motion from a patient with severe RV dilatation due to pulmonary regurgitation needing RV remodeling and pulmonary valve replacement operation. Computational models were constructed and solved to obtain RV stroke volume,… More >

Yu. Gaponenko¹, I. Ryzhkov², V. Shevtsova³

FDMP-Fluid Dynamics & Materials Processing, Vol.6, No.1, pp. 75-98, 2010, DOI:10.3970/fdmp.2010.006.075

Abstract Gas-liquid flows in annulus are analyzed for fluids in large range of viscosity ratios. The geometry corresponds to a liquid bridge co-axially placed into an outer cylinder with solid walls. The internal core consists of solid rods at the bottom and top, while the central part is a relatively short liquid zone filled with viscous liquid and kept in its position by surface tension. The gas enters into the annular duct and entrains initially quiescent liquid. The flow structures in the liquid and gas are obtained numerically for different shapes of solid rods. Solution for More >

Luke Currano, Wayne Churaman, Ronald Polcawich, Jeff Pulskamp, Chris Morris, Eugene Zakar Madan Dubey¹, Priya Vashishta²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.13, No.4, pp. 71-72, 2009, DOI:10.3970/icces.2009.013.071

Abstract Micro/Nano Electro-Mechanical-Energetics science and technology have emerged over the last decade as a very critical and highly visible component of nearly all scientific and engineering disciplines. The presentation will focus on recent enabling Piezoelectric Nano/MEMS science and technologies for sensors and electronics. Most recent development in nanoenergetic devices and its integration with MEMS for several novel applications in mechanical, electrical, chemical and optical research will also be reviewed. Basic science in modeling, simulation and validation of Micro and Nano devices will also be presented for possible future generation of smart and intelligent devices/systems. More >

S.R.K Vedula¹, T.S. Lim², W. Hunziker³, C.T. Lim¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.13, No.1, pp. 29-30, 2009, DOI:10.3970/icces.2009.013.029

Abstract The structural integrity as well as the regulation of paracellular diffusion of solutes across epithelial monolayers is critically regulated by the intercellular adhesion complex. The intercellular adhesion complex consists of a variety of proteins that perform different physiological functions. While proteins localizing at adherens junctions (nectins and e-cadherins) are important for initiating and stabilizing cell adhesion, proteins localizing at the tight junctions (occludin, claudins and junctional adhesion molecules) act as gates to regulate the diffusion of solutes across the epithelial monolayer. Despite significant advancement in the understanding of the biological roles of these cell adhesion More >

Hsien-Chie Cheng¹, Yu-Chen Hsu², Wen-Hwa Chen²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 73-74, 2009, DOI:10.3970/icces.2009.012.073

Abstract Due to the limitation of fabrication technologies nowadays, initial defects in carbon nanotubes (CNTs) are inevitably perceived particularly during the manufacturing process or chemical treatment. The investigation of the effects of initial defects existing in CNTs on their mechanical properties and fracture behaviors becomes essential for their potentiality in engineering applications.
In this study, the defect effects, including number in percentage, type, and location, are explored using the molecular dynamics (MD) simulation with Tersoff Brenner potential. Results show that the mechanical properties, such as the elastic modulus, failure strength and strain, are strongly affected by the… More >

Mohit Pant¹, I. V. Singh¹, B. K. Mishra¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.1, pp. 13-22, 2009, DOI:10.3970/icces.2009.012.013

Abstract In this work, element free Galerkin method (EFGM) has been used to obtain the solution of centre crack problem under thermo-mechanical loads as it provides a versatile technique to model static as well as moving crack problems without any requirement of re-meshing. Diffraction criterion has been used to model crack geometry. The effect of crack orientation of centre crack has been studied under both mechanical and equivalent thermal loading under plane stress conditions. The values of mode-I and mode-II stress intensity factors have been evaluated by the interaction integral approach. More >

Wen- Hsiang Hsiang¹, Kuen-Ming Shu², Chia-Heng Tsai¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.3, pp. 75-76, 2009, DOI:10.3970/icces.2009.011.075

Abstract The objective of this paper is to propose a novel mechanical press with six-links, and to verify its feasibility in precision cutting. First, the system is presented and its advantages are discussed. Then, the kinematic analysis of the system is obtained by examining the geometry of the design. Furthermore, the optimization approach for the design is presented. Finally, a design example is given to verify the feasibility of the design by conducting computer simulation. All the above analysis and design are illustrated by using a 6-bar linkage. The results shown that the developed system is More >

Hai-liang YU¹, Xiang-hua LIU¹, Ying ZHI¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.1, pp. 75-76, 2009, DOI:10.3970/icces.2009.009.075

Abstract Material properties and geometrical shape of rolled products are two of the most important problems in steel product, which are affected by the thermal distribution and deformation behavior during rolling. Analysis of the behavior of medium plate during multi-pass rolling is significant for guiding the production.

Recently years, the finite element method (FEM) has been widely used for analyzing the plate rolling processes, which has become an irreplaceable theory method. Rolling processes is a kind of continuous metal forming technology. Through multi-pass rolling processes, the shape and microstructure of plate could be obtained. However, in mostly… More >

Fernanda Gentil¹, Renato Natal Jorge², António Joaquim Mendes Ferreira³, Marco Parente⁴, Pedro Martins⁵, Eurico de Almeida⁶

The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.1, pp. 45-56, 2009, DOI:10.3970/icces.2009.009.045

Abstract The interest in finite element method (FEM) concerning biomechanics has been increasing, in particular, to analyze the mechanical behavior of the human ear. In this work, a finite element model of the middle ear was made. A dynamic study based on a structural response to harmonic vibrations, for different sound pressure levels, applied on the eardrum, is presented using the ABAQUS program. The model includes different ligaments and muscle tendons with elastic and hyperelastic behavior of these supportive structure. The non-linear behavior of the ligaments and muscle tendons was considered, being the connection between ossicles More >