Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
The interest of using precast segmental columns in construction of concrete bridges has significantly increased in recent years. One\nresearch area of concrete bridges is the application of Precast Prestressed Concrete Segmental (PPCS) Column in any structural\nanalysis software or FE programcode.Modeling a PPCS column,which consists of various materials with interaction between them,\nis complicated and time-consuming. This research attempts to formulate the stiffness matrix of PPCS columns in order to form the\nconstitutive model in linear form to evaluate the response of the columns. A two-dimensional finite element model is presented in\nthe finite element package ANSYS. Parametric studies are conducted by finite element models to verify the constitutive models for\nthe PPCS column with a different number of concrete segments. Comparison between the constitutive model and the FE program\nresults indicates that the constitutive model is accurate enough to predict the deformation of the PPCS columns....
A numerical simulation scheme is proposed to analyze domain tessellation and pattern formation\non a spherical surface using the phase-field method. A multi-phase-field model is adopted to\nrepresent domain growth, and the finite-difference method (FDM) is used for numerical integration.\nThe lattice points for the FDM are distributed regularly on a spherical surface so that a mostly\nregular triangular domain division is realized. First, a conventional diffusion process is simulated\nusing this lattice to confirm its validity. The multi-phase-field equation is then applied, and\npattern formation processes under various initial conditions are simulated. Unlike pattern formation\non a flat plane, where the regular hexagonal domains are always stable, certain different patterns\nare generated. Specifically, characteristic stable patterns are obtained when the number of\ndomains, n, is 6, 8, or 12; for instance, a regular pentagonal domain division pattern is generated\nfor n = 12, which corresponds to a regular dodecahedron....
Automated fibre placement (AFP) is an incipient manufacturing process for composite\nstructures. Despite its conceptual simplicity it involves many complexities related to the\nnecessity of melting the thermoplastic at the interface tape-substrate, ensuring the\nconsolidation that needs the diffusion of molecules and control the residual stresses\ninstallation responsible of the residual deformations of the formed parts. The\noptimisation of the process and the determination of the process window requires a\nplethora of simulations because there are many parameters involved in the\ncharacterization of the material and the process. The exploration of the design space\ncannot be envisaged by using standard simulation techniques. In this paper we\npropose the off-line calculation of rich parametric solutions that can be then explored\non-line in real time in order to perform inverse analysis, process optimisation or on-line\nsimulation-based control. In particular, in the present work, and in continuity with our\nformer works, we consider two main extra-parameters, the first related to the line\nacceleration and the second to the number of plies laid-up....
The waste heat from exhaust gases represents a significant amount of thermal energy, which has conventionally been used for\ncombined heating and power applications. This paper explores the performance of a naturally aspirated spark ignition engine\nequipped with waste heat recovery mechanism (WHRM) in a sedan car.The amount of heat energy from exhaust is presented and\nthe experimental test results suggest that the concept is thermodynamically feasible and could significantly enhance the system\nperformance depending on the load applied to the engine. However, the existence of WHRM affects the performance of engine by\nslightly reducing the power. The simulation method is created using an artificial neural network (ANN) which predicts the power\nproduced from the WHRM....
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