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New content is now available online. Please follow the links to view the content.Derivation and Validation of a Material Model for Clayey Sand for Use Inlandmine Detonation Computational Analyses
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789807990
<div><strong> Source: </strong>Volume 5, Issue 4, pp 311 - 344</div><div>A large-strain/high-deformation rate model for clay-free sand recently proposed and validated in our work [1,2], has been extended to sand containing relatively small (< 15vol.%) of clay and having various levels of saturation with water. The model includes an equation of state which represents the material response under hydrostatic pressure, a strength model which captures material behavior under elastic-plastic conditions and a failure model which defines conditions and laws for the initiation and evolution of damage/failure in the material. The model was validated by comparing the computational results associated with detonation of a landmine in clayey sand (at different levels of saturation with water) with their computational counterparts.</div>M. Grujicic, B. Pandurangan, N. Coutris, B. A. Cheeseman, W. N. Roy and R. R. Skaggs2009-10-01T00:00:00ZFractal Transition Model in Predicting Static Friction Coefficient
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789807972
<div><strong> Source: </strong>Volume 5, Issue 4, pp 345 - 348</div><div>There is a fractal characteristic in most engineering surfaces. Effects of the surface fractal parameters D, G and the material parameter ϕ on the static friction coefficient are discussed. The predicted static friction coefficient increases with the increase of normal load. This coincides with the fact that static friction coefficient is very low under very small normal load condition. Second, a fractal transition model is proposed which takes into account the change of fractal dimension D. The load-contact area relationship based on fractal transition model is not simply an exponential function, and the prediction correlates well with the experimental results. The predicted static friction coefficient based on fractal transition model first increases with the increase of load, and then decrease with the increase of load. The transition point is near D=1.5.</div>Sui Changfu and Sheng Xuanyu2009-10-01T00:00:00ZEffect of Dielectric Layer of a Distributed-Type Inorganic High-luminosity Electroluminescent Panel
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789807981
<div><strong> Source: </strong>Volume 5, Issue 4, pp 349 - 354</div><div>The inorganic high-luminosity electroluminescent (EL) panel used in this study is a distributed-type EL panel, which can be produced using a printing technique. We obtained a panel with a high luminosity of 7940 cd/m<sup xmlns="http://pub2web.metastore.ingenta.com/ns/">2</sup> at 6 kHz. In addition, we believed that the panel temperature and luminosity of this panel were closely related. Therefore, we considered the relationship between the temperature change in the dielectric layer and the luminosity since this relationship is responsible for the supply of electric charge to the phosphor layer. A change in the amount of electric charge by heating in a high-voltage domain originates at the Curie point of BaTiO<sub xmlns="http://pub2web.metastore.ingenta.com/ns/">3</sub> ferroelectric particles. This indicates that the influence of BaTiO<sub xmlns="http://pub2web.metastore.ingenta.com/ns/">3</sub> was strong.</div>Toshifumi Satoh2009-10-01T00:00:00ZStress Analysis of Conical Shell Skirt Support for High Pressure Vessel Using Finite Element Method
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789808007
<div><strong> Source: </strong>Volume 5, Issue 4, pp 355 - 362</div><div>Pressure vessel is a closed cylindrical vessel for storing gaseous, liquids or solid products. The stored medium is at a particular pressure and temperature. The cylindrical vessel is closed at both ends by means of dished head, which may be hemispherical, ellipsoidal. The pressure vessels may be horizontal or vertical. The supporting system of this vertical vessel plays an important role in the performance of the equipment. Proper supporting system gives better efficiency. The bottom supports are critical components since they are to be designed with much care to avoid failure due to internal pressure with temperature. In this analysis, skirt support for vertical vessel was analyzed as per the guidelines given in the ASME (American Society of Mechanical Engineering) section VIII division 2 and IBR (Indian Boiler Regulations) standards. The stress analysis was carried out for this support using a general purpose FEM code, ANSYS macros. The coupled field (Structural and Thermal) Analysis was carried out for skirt support to find out the stresses in the support. The analysis's results were compared with ASME code allowable stress values.</div>K. Tamil Mannan, Rakesh Saxena, R. Murugavel and P.L. Sah2009-10-01T00:00:00ZNon-Linear Fracture Study of Glass Fibre Reinforced Polymer Composites Using a Tapered Double Cantilever Beam
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789807945
<div><strong> Source: </strong>Volume 5, Issue 4, pp 363 - 366</div><div>Mode I static fracture behavior of polymer composites is studied using the tapered double cantilever beam test method. A non-linear three-dimensional finite element model is developed to analyze the test data. The fracture toughness is evaluated using a <i xmlns="http://pub2web.metastore.ingenta.com/ns/">J</i>-integral approach. A non-uniform distribution of the <i xmlns="http://pub2web.metastore.ingenta.com/ns/">J</i>-integral value along the crack front is obtained with maximum at the mid-plane of the specimen. It is shown that taking into account the damage induced non-linear behavior improves the fracture toughness. This is explained with increased strain energy dissipation as a result of the non-linear behavior.</div>V. Rizov and A. Mladensky2009-10-01T00:00:00ZThermal Analogy Method for Static and Dynamic Analysis of an Electrostrictive Beam
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789808025
<div><strong> Source: </strong>Volume 5, Issue 4, pp 367 - 376</div><div>A thermal analogy method for the static and dynamic analysis of an electrostrictive beam by incorporating the nonlinear characteristics of the electrostrictive materials is described in this paper. The analogy between thermo elastic finite element formulation and the electrostrictive material finite element formulation developed in this paper was explored. Based on this analogy, the voltage actuation of the electrostrictive beam can be simulated accurately using the conventional elastic finite element model with the thermal actuation. The finite element model includes the quadratic dependence of strain with electric field, valid at constant temperature and mechanical prestress, and excludes hysteresis.</div>R Jerome and N Ganesan2009-10-01T00:00:00ZThermal Analysis of a Continuous Flow Polymerase Chain Reaction Microdevice Using Analytical Finite Element Simulation
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789807954
<div><strong> Source: </strong>Volume 5, Issue 4, pp 377 - 388</div><div>A simplified general purpose analytical finite element model has been developed to analyze the thermal performance of a continuous flow polymerase chain reaction (CPCR) microdevice. The corresponding governing differential equations along with the appropriate boundary conditions have been solved using a self-developed code in Matlab®. Results obtained from the finite element simulations have been validated with available published results and also showed good agreement with those obtained from commercial FEA package, ANSYS®. The present methodology has an added advantage due to its flexibility where the unit cell of the finite element model can be arranged into different orientation for analyses of different CPCR microdevice configuration. In microchannel heat sinks, the results obtained agree well with the published result which demonstrates the flexibility and robustness of present methodology to be used for various applications.</div>Hing Wah Lee, Ishak Abdul Azid and Kankanhally Narasimha Seetharamu2009-10-01T00:00:00ZObtaining Creep Damage of Aluminum Alloy 2A12 by Using Indentation Method with Different Indenters
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789807963
<div><strong> Source: </strong>Volume 5, Issue 4, pp 389 - 394</div><div>Indentation tests performed in creep damage materials show that slopes of initial portions of unloading curves which are often used to calculate indented modulus can characterize creep damage. To evaluate the influence of different indenters in determining creep damage, conical, spherical and cylindrical indenters which are all self-similar in shape were considered by using the Finite Element Method (FEM). Indentation load (<i xmlns="http://pub2web.metastore.ingenta.com/ns/">P</i>)-displacement (<i xmlns="http://pub2web.metastore.ingenta.com/ns/">h</i>) curves and equivalent elastic modulus (<i xmlns="http://pub2web.metastore.ingenta.com/ns/">E</i>'')-creep damage (<i xmlns="http://pub2web.metastore.ingenta.com/ns/">ω</i>) curves were given. Results show that the cylindrical indenter is appropriate for “soft” materials, the conical indenter is suitable for small creep damage materials, and the spherical indenter can be used in many other materials.</div>Bin Zhao2009-10-01T00:00:00ZEffects of Inclined Magnetic Field on a Fluid with Non-linear Variable Viscosity in a Uniform Tube with Peristalsis
http://booksandjournals.brillonline.com/content/journals/10.1163/157361109789808016
<div><strong> Source: </strong>Volume 5, Issue 4, pp 395 - 409</div><div>In order to determined the characteristics of peristaltic transport of the Newtonian fluid with variable viscosity through a cylindrical tube having walls that are transversely displaced by an in finite, harmonic traveling wave of large wavelength and negligibly small Reynolds number was analyzed in the presence of magnetic field directed with an angle <i xmlns="http://pub2web.metastore.ingenta.com/ns/">ω</i>. A perturbation method of solution is thought. The viscosity parameter <i xmlns="http://pub2web.metastore.ingenta.com/ns/">α</i> <<1 is chosen as a perturbation parameter. It serves as a model for the study of flow of chyme through small intestines. The governing equations are developed up to first-order in the viscosity parameter (α). In case of the first-order system, simpling a complicated group of products of Bessel functions by approximating polynomial. The results show that, the increasing of magnetic field increases the pressure rise. Also, the pressure rise at normal magnetic field (ω=π/2) is greater than the pressure rise at inclined magnetic field (0<ω<π/2). In addition, the pressure rise increases as the viscosity parameter decreases at certain values of flow rate. Comparisons with other studies are given.</div>A. H. Abd Elnaby and I. I. El Shamy2009-10-01T00:00:00Z