Jun Wang, David CC LAM

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 89-90, 2011, DOI:10.3970/icces.2011.020.089

Abstract Selected elastic and plastic behaviors of materials have been shown to exhibit size-dependence when they are in the micro-nanoscale. Experiments have shown that the scale-dependent behavior can be modeled by adding strain gradient terms into the finite element models, but modifications need to satisfy C1 displacement continuity in the models. In this investigation, meshless finite element formulation, where C1 continuity can be satisfied without new additions nodal degrees of freedom, was developed. In the formulation, the strain gradients were decomposed into dilatation, stretch and rotation parts; and the governing equations were discretized on local domains More >

Yifan Xia, Jie Wang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 87-88, 2011, DOI:10.3970/icces.2011.020.087

Abstract Phase field simulation is an effective way to predict the domain evolution in ferroelectric materials. A phase field model is developed to investigate the domain structures and polarization switching in in ferroelectric thin films with deadlayers. Simulation results show that the deadlayers as well as misfit strain have a significant influence on the domain structures and polarization switching in the ferroelectric thin films. It is found that the simulated switching electric field in ferroelectric thin films decreases with the thickness of the deadlayers increasing. More >

David CC LAM^*, Leo K-K LEUNG, Match W-L KO, R. G-Z CHEN, I-S CHAN

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 85-86, 2011, DOI:10.3970/icces.2011.020.085

Abstract The eye is a biomechanical organ where the health of the optical nerves and vision are affected by the intrCular pressure and the ocular tissue structure. The ocular pressure is the primary parameter monitored by opticians and ophthalmologists to determine the ocular health of the eye to prevent glaucoma where 50% of the vision can be lost before detection by the patient. Elevated intrCular pressure is clinically correlated with the degeneration of the optic nerves, but the biomechanical mechanism for the degeneration remains speculative. In this study, we present the results from biomechanical modeling of More >

Nengguang Liu, Wei Gao, Chongmin Song, Nong Zhang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 83-84, 2011, DOI:10.3970/icces.2011.020.083

Abstract This paper presents the probabilistic dynamic analysis of vehicle-bridge interaction systems. The bridge's and vehicle's parameters are considered as random variables as well as the road surface roughness is modeled as random process. A quarter-car model is used to represent a moving vehicle and the bridge is treated as an Euler-Bernoulli beam. From the equation of motion for the vehicle-bridge coupling system, the expressions for mean value and standard deviation of bridge response are developed by using the random variable's functional moment method. The effects of the individual system parameters and the road surface roughness More >

Xiaoying Zhuang, Yongchang Cai, Hehua Zhu.

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 81-82, 2011, DOI:10.3970/icces.2011.020.081

Abstract Meshless methods have shown advantages in dealing with problems of moving interfaces such as crack propagation in rock. In Tongji University, meshless methods, the meshless Shepard and least squares (MSLS) method and the element-free Galerkin (EFG) method have been applied to slope stability analysis, especially for rock slope stability governed by a number of dominating discontinuities. Previous studies have focused on 2D problems where a joint surface is modelled as a crack line [1]. In this paper, the EFG method is extended for analyzing 3D rock slope with a single planner elliptic joint. Due to More >

Prakash Thamburaja

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 79-80, 2011, DOI:10.3970/icces.2011.020.079

Abstract Some recent experiments on sub-micron and nano-sized metallic glass specimens have shown that the shear localization process becomes more stable and less catastrophic when compared to the response exhibited by large sample sizes. This leads to the discovery that the shear localization process and fracture can be delayed by decreasing sample volume. In this work we develop a non-local and finite-deformation-based constitutive model using thermodynamic principles and the theory of micro-force balance to study the causes for the aforementioned observations. The constitutive model has also been implemented into a commercially-available finite-element program by writing a… More >

Jie Wang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 77-78, 2011, DOI:10.3970/icces.2011.020.077

Abstract Ferroelectric nanostructures exhibit vortex structures with the shrinking of the relevant lengths to the nanometer scale because of the strong depolarization field. The vortex structure in the nanoscale ferroelectrics, similar to the vortex structure in magnetic nanostructure, is regarded as a toroidal order which is different from the common homogeneous polarization order. The finding of the vortex in ferroelectric nanostructures opens exciting opportunities for designing nanomemory devices, which holds a promise to increase the density of ferroelectric nonvolatile random access memories by several orders of magnitude. The switching behavior of polarization vortex under a curled… More >

Chi-Ming Lee, NASA Glenn Research Center

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 75-76, 2011, DOI:10.3970/icces.2011.020.075

Abstract The fuel-flexible, low-NOx (Nitrogen oxides) combustor task of the Environmentally Resonsible Aviation (ERA) project is to develop a low emissions combustor capable of meeting the Landing and Take-Off (LTO) NOx emissions reduction while reducing aircraft fuel burn by 50% without negatively impacting other emissions and achieving perceived noise levels 42 dB below stage 4 limits. The low emissions combustor should be capable of meeting the mid-term LTO NOx goal of 75% reduction from the International Civil Aviation Organization (ICAO) standard adopted at Committee on Aviation Environment Protection (CAEP 6). In addition to NOx and Other… More >

Kang-Hai TAN

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 73-74, 2011, DOI:10.3970/icces.2011.020.073

Abstract This paper presents the behaviour and modelling of two experimental programmes, viz. one on typical extended end-plate steel beam-to-column (conventionally deemed as "fully rigid" joints) and another on composite steel beam- to-column (conventionally deemed as ßemi-rigid" joints) under fire conditions. The first programme comprised three beam-column cruciform joints tested at isothermal temperature of 400C, 550C and 700C, and another three specimens at 700C but subjected to different axial restraints. The second programme consisted of six ambient temperature tests (as control specimens) and eight elevated-temperature tests on composite top-and-seat-and-web (TSW) angle joints under vertical loading. It… More >

Lakis A. A., Toorani M. H., Kerboua Y., Esmailzadeh M., Sabri F.

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 71-72, 2011, DOI:10.3970/icces.2011.020.071

Abstract This paper review focuses mainly on development and application of a hybrid finite element approach used for linear and geometrically nonlinear vibration analysis of isotropic and anisotropic plates and shells, with and without fluid-structure interaction. Development of a hybrid element for different geometries of plates and shells is briefly discussed. In addition, studies dealing with particular dynamic problems such as dynamic stability and flutter of plates and shells coupled to flowing fluids are also discussed. This paper is structured as follows: after a short introduction on some of the fundamentals of the developed model applied More >