Open Access
ABSTRACT
Wei-Ming Lee, Jyun-Sian He, Jhong-Sian Guo
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 65-66, 2011, DOI:10.3970/icces.2011.018.065
Abstract A semi-analytical approach is presented to solve two-dimensional interior and exterior acoustic problems with elliptical boundaries. The eigenproblems for the interior domain and the scattering problems for the exterior domain are both to be investigated. To satisfy the Helmholtz equation in elliptical coordinates, the multipole expansion for the acoustic pressure is formulated in terms of angular and radial Mathieu functions. The boundary conditions are satisfied by uniformly collocating points on the boundaries. The acoustic pressure at each boundary point is directly calculated in each local elliptical coordinate system. For the multiply connected domain problems, the normal derivative of the acoustic… More >
Open Access
ABSTRACT
Dalin Tang1, Chun Yang2, Satya Atluri3
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 67-68, 2011, DOI:10.3970/icces.2011.018.067
Abstract Cardiovascular disease is the leading cause of death worldwide. Many victims of the disease died suddenly without prior symptoms. It is a great challenge for clinicians and researchers to develop screening techniques and assessment methodologies to identify those patients for early treatment and prevention of the fatal clinical event. Considerable effort has been devoted investigating mechanisms governing atherosclerotic plaque progression and rupture [Friedman, Bargeron, Deters, Hutchins and Mark (1987); Friedman and Giddens (2005); Giddens, Zarins, Glagov, S. (1993); Ku, Giddens, Zarins and Glagov (1985); Gibson et al. (1993); Liu and Tang (2010); Stone et al. (2003); Yang, Tang, Atluri et… More >
Open Access
ABSTRACT
Yan Liu, Xiong Zhang, Yanping Lian
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 69-70, 2011, DOI:10.3970/icces.2011.018.069
Abstract The analyses of bird strike are of great concern to aircraft designers, because bird strikes can cause very serious problems to flight safety. Meshfree particle methods are suitable for simulating bird strike problems owing to their advantages in dealing with large deformation, fracture and fluid-structure interaction. The material point method (MPM) is employed to analyze the impacting of bird on windshield in this talk in which both the bird and the windshield are discretized by material points. The material model of the bird is accompanied by an appropriate equation of state (EOS) to model the flow behavior during impact, while… More >
Open Access
ABSTRACT
Yao-Ming Zhang, Zhao-Yan Liu, Jeng-Tzong Chen
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 71-72, 2011, DOI:10.3970/icces.2011.018.071
Abstract Abstract The presentation is mainly devoted to the research on the regularized boundary integral equations with indirect unknowns for anisotropic elastic problems. Based on a new idea, a novel regularization technique is pursued, in which the nonsingular indirect BIE excluding the CPV and HFP integrals is established. The proposed indirect BEM has many advantages. Firstly, the anisotropic problems to be considered can be solved directly without transforming them into isotropic ones so that no inverse transform is required. Secondly, the proposed method doesn't need to calculate multiple integral as the Galerkin method, and but rather treat CPV integrals indirectly, so… More >
Open Access
ABSTRACT
Xuedong Bai
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 73-74, 2011, DOI:10.3970/icces.2011.018.073
Abstract The in-situ transmission electron microscopy (TEM) method has been developed to probe the novel properties of nanomateials. It is powerful in a way that it can directly correlate the microstructure of the nanomaterials with their physical properties for the same nanoscale sample. In this talk, I will report on the construction and applications of a home-made in-situ TEM platform for nanomanipulation and nanomeasurements.
Mechanics and electromechanical coupling of individual nanowires have been studied inside TEM. The mechanism of resistance switching effects of nanoscale ionic conductors has been revealed by in-situ TEM high-resolution observation. And the transport properties of carbon… More >
Open Access
ABSTRACT
LI Tao, Gao Jian, ZHANG Yi-ping
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 75-76, 2011, DOI:10.3970/icces.2011.018.075
Abstract This paper presents a method for the large strain consolidation analysis of soft-clay road embankment with stochastic parameters to random excitation. Based on the large strain theory of continuum material, Biot consolidation theory and Neumann stochastic finite element method (NSFEM), the large strain consolidation NSFEM (LSC-NSFEM) has been established. A program of LSC-NSFEM is designed to analyze soft-clay road embankment. The residue iteration method is used to deal with the nonlinear fluctuating part of stiffness matrix, and the approximate algorithm of the fluctuating part of stiffness matrix is designed to improve LSC-NSFEM program efficiency. More >
Open Access
ABSTRACT
Xianyu Su, Qican Zhang, Wenjing Chen
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 77-78, 2011, DOI:10.3970/icces.2011.018.077
Abstract Fourier transform method has been widely sued on fringe analysis in optical metrology, including the structured illumination metrology and the interference metrology. The Fourier transform profilometry is one of the popular non-contact 3-D shape measurement methods, where a Ronchi grating or sinusoidal grating is projected onto a 3-D diffuse surface, and the resulting deformed grating image is detected by a CCD camera and processed by a computer. This method requires only one frame of the deformed fringe pattern to retrieve the surface of measured object, so it has obvious advantage for real-time data acquisition and 3-D measurement of dynamic process.… More >
Open Access
ABSTRACT
J. Sladek, V. Sladek, M. Wonsche, Ch. Zhang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 79-80, 2011, DOI:10.3970/icces.2011.018.079
Abstract It is well known that the coupling nature of piezoelectric materials has led to their wide applications. Interface failure is one of the most dominant failure mechanisms in laminated piezoelectric elements and structures. A meshless method based on the local Petrov-Galerkin approach is proposed, to solve the interface crack problem between two dissimilar piezoelectric solids. Permeable and impermeable electrical boundary conditions are considered on the crack faces. Stationary governing equations for electrical fields and the elastodynamic equations with an inertial term for two-dimensional (2-D) mechanical fields are considered. Nodal points are spread on the analyzed domain, and each node is… More >
Open Access
ABSTRACT
D. Shaw, W.L. Su
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 81-82, 2011, DOI:10.3970/icces.2011.018.081
Abstract Linear rolling ball guideway is a key component of many machines. However, due to the point contact between the ball and the groove, stiffness of linear guideway is the major factor which affects the rigidity and precision of machines. Preload in the guideway can increase the stiffness of linear guideway and thus reduces the position deviation under an external load. The purpose of this study is to develop FEA and compare the results with experimental results to prove the correctness of the FEA model. This model can be used to predict the stiffness of linear guideway with 4 rows of… More >
Open Access
ABSTRACT
Cheng Yan, Zhuo-Cheng Oui?a, Zhuo-Ping Duan, Feng-Lei Huang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 83-84, 2011, DOI:10.3970/icces.2011.018.083
Abstract Dynamic behaviors of tensile strength of brittle materials are investigated analytically, and an explicit mathematical expression for the dynamic tensile strength under a quadratic boundary loading is derived, together with the so-called structural-temporal failure criterion. The analytical solution shows reasonably good agreement with the previous dynamic experimental data. Moreover, it is shown by using the explicit expression that the dynamic tensile strength of brittle materials can be determined completely by the quasistatic material parameters such as the quasistatic tensile strength, material density and the incubation-time, which implies that the so-called strain-rate effect on the strength of brittle materials should not… More >
Open Access
ABSTRACT
D. Shaw, W.L. Su
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 85-86, 2011, DOI:10.3970/icces.2011.018.085
Abstract The contact angle affects the life and accuracy of a linear gudieway. In this study, the factors which effect the angle of contact angle of linear guideway includes contact deformation of balls and grooves, downward load, ball diameter, number of load-carrying balls, number of load-carrying rows and conformity. A theoretical approach for finding the contact angle changed of linear gudieway is proposed by using Hertzian theory and Lundeberg/Palmgren approach. The results are useful for modification of loading capability of linear gudieway under load and different preload setting. More >
Open Access
ABSTRACT
Choong- Han Han, Hei-Sook Nah, Won-Sik Choi, Ki-Beom Ju, Jong-Kwan Song
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 87-88, 2011, DOI:10.3970/icces.2011.018.087
Abstract This study is aimed at improving the safety and maximizing construction productivity by effectively grafting SOC facility construction material to RFID/USN technology for the purpose of science in the maintenance of SOC facility. More >
Open Access
ABSTRACT
Bin GU, LC Zhang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 89-90, 2011, DOI:10.3970/icces.2011.018.089
Abstract Bridging the atomic and continuous analyses is an important aspect in multi-scale mechanics. This paper develops a computational method to integrate the atomic potential of a material with the finite element method. The novelty of this method is that the strain energy is calculated from the atomic potential without the assumption in the Cauchy-Born rule that deformation in a virtual atomic cell is homogeneous. In our new method, the virtual atomic cell deformation is interpolated according to the continuum displacements constructed associated with the shape functions. The applications of the method to single crystal Si and Ge bars under uniaxial… More >
Open Access
ABSTRACT
T. Watanabe, T.Gotoh
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 91-92, 2011, DOI:10.3970/icces.2011.018.091
Abstract The effects of polymer additives on decaying isotropic turbulence were numerically investigated using a hybrid approach. The approach consisted of a Brownian dynamics simulation with an enormous number of dumbbells
and a turbulence DNS with large-scale parallel computations. A reduction of the energy dissipation rate and modification of the kinetic
energy spectrum were observed when the reactions of the polymers were incorporated into the fluid motion. We found that results with few polymers and large replicas could approximate those with many polymers and smaller replicas as far as the large-scale statistics were concerned. More >
Open Access
ABSTRACT
Y. Senda, M. Fujio, S. Shimamura, J. Blomqvist, R. M Nieminen
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 93-94, 2011, DOI:10.3970/icces.2011.018.093
Abstract Atomistic molecular dynamics simulation for"polymer melts has been performed inten-sively and revealed the dynamical behavior of atomistic"chain structure in the melt. These atomistic"calculations, however, have been limited by the massive computational costs because of macroscopic properties of long chain polymer. It would be highly de-sirable to use a multiscale approach covering atomistic and macroscopic behavior of the polymer melt.
We have developed computational method coupling atomic model and continuum model [1] and applied the method to polymer melt consisted of the long chain polymers. The polymer molecule is coarse-grained into meso-scopic model by so-called spring- beads model. This spring-beads model… More >
Open Access
ABSTRACT
Zhanwei Liu, Huimin Xie, Fulong Dai
The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 95-96, 2011, DOI:10.3970/icces.2011.018.095
Abstract The mechanical behaviors of microstructures and micro devices have drawn the attention from researchers on materials and mechanics recently. To understand the rule of these behaviors, the deformation measurement techniques with micro/nanometer sensitivity and spatial resolution are required. In this report, a geometric phase analysis technique, SEM scanning moirAC method, digital phase moirAC method based on gratings and a micro-marker identification method are introduced to meet the deformation evaluation requirement of MEMS. The geometric phase analysis technique is performed on the basis of regular gratings, instead of natural atom lattice. The regular gratings with a pitch of range from micrometer… More >
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