Romy P. Moreno¹, Mario G. Villeda², Sergio A. V. Pruneda², Zeferino D. Noriega², Pedro G. Segura²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.1, pp. 19-24, 2008, DOI:10.3970/icces.2008.008.019

Abstract Measuring the position, speed and acceleration of the moving elements of a mechanism usually involves external instrumentation that has to be attached to it, which is not always feasible. The method discussed here provides an alternative to measure these kinematics characteristics without modifying the components. To test the method in a controlled environment a four-bar mechanism was build. It was designed to be as thin as possible and to allow arbitrary changes in its lengths. Three commercial programs and a specially designed software (KIMA{\textregistered }) are used to record, analyze, measure, compute and verify the kinematics of the mechanism. More >

Q. Ma^1,2, J. L. Beuth¹, G. H. Meier³, F. S. Pettit³

The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.1, pp. 13-18, 2008, DOI:10.3970/icces.2008.008.013

Abstract This paper addresses the mechanics of indentation-induced delamination of a coating on a multi-layered hollow cylinder, for application to toughness testing of thermal barrier coating (TBC) systems. An electron-beam physical vapor deposition (EB-PVD) TBC system has been analyzed through a contact finite element model using a standard conical indenter impressed vertically on the top of the cylinder. Two cylinder sizes used in thermal-mechanical fatigue tests in literature have been considered in the analysis, with outer radii of 5.11 mm and 3.08 mm, and inner radii of 3.00 mm and 0.97 mm, respectively. Two boundary conditions for the inner surface of… More >

G. Papaioannou¹, G. Nianios¹, C. Mitroyiannis¹, S.Tashman², K.H. Yang²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.1, pp. 7-12, 2008, DOI:10.3970/icces.2008.008.007

Abstract Little is known about in vivo menisci loads and displacements in the knee during strenuous activities. We have developed a method that combines biplane high-speed dynamic radiography (DRSA) and a subject-specific finite element model for studying in vivo meniscal behavior. In a very controlled uniaxial compression loading condition, removing of the pressure sensor from the model can result in relatively large errors in contact and cartilage stress that are not reflected in the change of meniscal displacement. More >

G. Kanevce¹, L. Kanevce², V. Mitrevski³, G. Dulikravich⁴

The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.1, pp. 1-6, 2008, DOI:10.3970/icces.2008.008.001

Abstract This paper deals with the application of inverse concepts in drying. The objective of the paper is estimation of the moisture diffusivity of a drying body by using only temperature measurements. Potato and apple slices have been chosen as representative drying bodies with significant shrinkage effects. A mathematical model of the drying process of shrinking bodies has been applied. The Levenberg-Marquardt method and a hybrid optimization method of minimization of the least-squares norm were used to solve the present parameter estimation problem. More >

H. Cifuentes¹, F. Medina²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.4, pp. 197-202, 2008, DOI:10.3970/icces.2008.007.197

Abstract The most popular expression that considers the size effect showed in concrete structures is the size effect law of Bazant. This law depends on two coefficients G_f and c_f. For the experimental determination of these coefficients is necessary obtaining the ultimate loads, in three points bending tests, of notched beams with different sizes. In this work, a method to determine the coefficients about the results on identical beams varying the deep of the notch, is presented. The necessary values of loads are obtained by a numerical analysis with FEM that considers non linear behaviour of the concrete material. Next the… More >

S.C. Wang¹, C.S. Lin²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.4, pp. 189-196, 2008, DOI:10.3970/icces.2008.007.189

Abstract Protecting against basement fires in commercial buildings is of major concern in Taiwan. Basements typically fill with high-temperature dense smoke rapidly during a fire, frequently generating deadly conditions that hinder escape from a fire. The water-mist fire suppression system (WMFSS) is a highly efficient fire suppression device that enhances the safety of people during a basement fire. The tiny water droplets with various diameters can absorb large amount of heat and the water vapors can prevent the occurrence of flashover during a building fire. This study investigates fire-suppression characteristics using a WMFSS in a basement barbershop fire accident in Taiwan.… More >

H. N. Silva¹, J. B. Soares¹, E. Parente Jr.², P. C. Sousa¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.4, pp. 181-188, 2008, DOI:10.3970/icces.2008.007.181

Abstract The numerical implementation of the time-dependent linear viscoelastic constitutive model using object-oriented programming is discussed here. This paper is divided in two main parts: (i) a brief discussion of the numerical integration of linear viscoelastic constitutive equations, including the use of Prony series for characterization of viscoelastic materials (e.g. asphalt pavement surfaces) and (ii) the class organization and methods implemented in viscoelastic related classes of an object-oriented framework. The implementation is part of an ongoing development Finite Element (FE) computer system for pavement analysis and research. More >

Weihua Zhang¹, Guangrong Tian, Maoru Chi

The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.4, pp. 173-180, 2008, DOI:10.3970/icces.2008.007.173

Abstract This article has no abstract. More >

Y. Y. Kim¹, B. Y. Lee², J. K. Kim²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.4, pp. 167-172, 2008, DOI:10.3970/icces.2008.007.167

Abstract The fiber dispersion performance in fiber-reinforced cementitious composites is a crucial factor with respect to achieving desired mechanical performance. However, evaluation of the fiber dispersion performance in the composite PVA-ECC (Polyvinyl alcohol-Engineered Cementitious Composite) is extremely challenging because of the low contrast of PVA fibers with the cement-based matrix. In the present work, an enhanced image processing technique including more detailed classification of types of fibers and adaptation of a morphological reconstruction, the fiber detection performance is enhanced. Test results using artificial and real fiber images showed that a distribution coefficient α_f, referred to as the fiber dispersion coefficient was… More >

S. Shiotani¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.4, pp. 159-166, 2008, DOI:10.3970/icces.2008.007.159

Abstract This paper deals with the numerical estimation of the ocean surface wind in a bay. Such estimates are very important because the wind reacts to environmental problem, such as the effects of a marine structure or a sailing ship. The estimation of the ocean surface wind was carried out in Osaka Bay in Japan using the mesoscale meteorological model MM5. The calculated numerical results were compared with the observed ones. It was confirmed that the ocean surface wind in Osaka Bay was accurately estimated. As an application of the estimation of wind in the bay, navigational simulations of a sailing… More >