J. Sladek¹, V. Sladek¹, P. Solek²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.1, pp. 35-36, 2009, DOI:10.3970/icces.2009.012.035

Abstract Functionally graded materials are multi-phase materials with the phase volume fractions varying gradually in space, in a pre-determined profile. This results in continuously graded mechanical properties at the (macroscopic) structural scale. Often, these spatial gradients in material behaviour render FGMs as superior to conventional composites. FGMs possess some advantages over conventional composites because of their continuously graded structures and properties. Due to the high mathematical complexity of the initial-boundary value problems, analytical approaches for elastic analyses of FGMs are restricted to simple geometries and boundary conditions. The elastic analysis in FGM demands an accurate and efficient numerical method.
In spite… More >

T. Asada¹, N. Ohno¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.4, No.4, pp. 201-206, 2007, DOI:10.3970/icces.2007.004.201

Abstract In this study, to determine incremental, perturbed displacement fields in periodic inelastic solids, an incremental homogenization problem is fully implicitly formulated, and an algorithm is developed to solve the homogenization problem. It is shown that the homogenization problem can be iteratively solved with quadratic convergences by successively updating strain increments in unit cells, and that the present formulation allows versatility in the initial setting of strain increments in contrast to previous studies. The homogenization algorithm developed is then examined by analyzing a holed plate, with an elastoplastic micro-structure, subjected to tensile loading. It is thus demonstrated that the convergence in… More >

Y. Kato, Y. Yamamura

The International Conference on Computational & Experimental Engineering and Sciences, Vol.4, No.2, pp. 87-92, 2007, DOI:10.3970/icces.2007.004.087

Abstract The purpose of this study is to investigate the deformational behavior and strength of the catheter which is made from the soft nylon resin and is reinforced with thin stainless wires called braid. When we image the usage conditions of catheter in the actual surgical operation, it is expected that the multi-axial loading for tension, torsion and the bending are applied and deformations occurring in the catheter become very complicated. As the first step of this study to reveal these phenomena, the combined loadings for tension and torsion are chosen as the subject of this study and we carry out… More >

M.D. de Tullio¹, P. De Palma¹, G. Pascazio¹, M. Napolitano¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.3, No.3, pp. 151-156, 2007, DOI:10.3970/icces.2007.003.151

Abstract This paper provides a numerical method based on the immersed boundary approach for computing compressible viscous flows. The efficency of the method is enhanced by using a flexible local grid refinement technique which is obtained by coarsening a uniformly fine mesh far from high-gradient flow regions, such as boundary layers and shocks. More >

J. Sladek¹, V. Sladek¹, Ch. Zhang², C.L. Tan³

The International Conference on Computational & Experimental Engineering and Sciences, Vol.3, No.2, pp. 87-92, 2007, DOI:10.3970/icces.2007.003.087

Abstract In this paper, the Meshless Local Petrov-Galerkin (MLPG) method for two-dimensional (2-d), linear and transient coupled thermoelastic analysis in orthotropic solids is presented. To eliminate the time-dependence in the governing equations, the Laplace-transform technique is used. Local integral equations are derived for small circular sub-domains which surround nodal points distributed over the analyzed domain. As for the spatial variations of the displacements and temperature, they are approximated by the Moving Least-Squares (MLS) scheme. More >

Engozogho Anris Starlin Peguy^1,2, Bikoro Bi Athomo Arsene^1,2, Vidal Marcia⁵, Denaud Louis⁴, Safou Tchiama Rodrigue^2,3, Charrier Bertrand¹

Journal of Renewable Materials, Vol.7, No.6, pp. 517-522, 2019, DOI:10.32604/jrm.2019.04051

Abstract In order to promote convenient strategies for the utilization of wood wastes from aucoumea klaineana pierre (okoume) timber industry, various chemical analysis were carried out on samples from different origins. Total extractives content of the bark, sapwood and heartwood of okoume were evaluated. thermogravimetric analyses were performed and the stiasny number was calculated. it was found that the bark was richer in fatty acid of high molecular weight while the sapwood was rich in fatty acid of low molecular weight. the condensed tannins content varied according to the origin and the part of the tree. these new findings should be… More >

Edgars Vanags*, Mikelis Kirpluks, Ugis Cabulis and Zuzana Walterova

Journal of Renewable Materials, Vol.6, No.7, pp. 764-771, 2018, DOI:10.7569/JRM.2018.634111

Abstract In this work, free tall oil fatty acids were epoxidized with in-situ generated peroxyacetic acid. Reaction kinetics of epoxidation was investigated by oxirane content and iodine value titrimetric determination, as well as FTIR spectra analysis. A highly functional biobased polyol was synthesized by functionalizing epoxidized tall oil fatty acids with triethanolamine using Montmorillonite K10 as a catalyst. The obtained polyol was analyzed by FTIR and MALDI-TOF MS. The most common chemical and physical characteristics of obtained polyol were determined. More >

Ziad Saghir, Cayley Delisle, Christopher Welsford^*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 19-19, 2019, DOI:10.32604/icces.2019.05145

Abstract The enhancement of consumer and industrial electronics has led to an increase in both the power and compactness of the products available. However, with these increases follows a subsequent increase in the thermal losses experienced across, for example, a central processing unit (CPU). As well, the need to dissipate waste thermal energy is compounded by the increased compactness. As the chipsets become smaller, the threads contained therein also reduce in size and as such become more sensitive to temperature gradients which can cause deformation. Although this deformation is miniscule, its continuous repetition can ultimately result in a thermally induced fatigue… More >

C. L. Tan¹, Y.C. Shiah²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.1, pp. 27-32, 2009, DOI:10.3970/icces.2009.009.027

Abstract A BEM formulation for the numerical stress analysis of 3D generally anisotropic elastic solids is presented in this paper. It is based on closed-form algebraic expressions of the fundamental solutions derived by Ting and Lee [7] and Lee [8] which are defined in terms of Stroh's eigenvalues, and has never been implemented previously in the literature. The veracity of the formulation and implementation is demonstrated by two engineering examples. More >

P.D. Shah¹, C.L. Tan¹, X. Wang¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 75-80, 2007, DOI:10.3970/icces.2007.001.075

Abstract The path-independent mutual- or M-integral for the computation of the T-stress for interface cracks lying between dissimilar anisotropic, linear elastic solids is developed in this paper. For the numerical stress analysis, the Boundary Element Method (BEM) is employed and special crack-tip elements with the proper oscillatory traction singularity are used. The successful implementation of the scheme for evaluating the T-stress of an interface crack between anisotropic bi-materials with BEM is demonstrated by numerical examples. More >