In this paper we analyzed the displacement and the deformation of grains and grain boundaries in a virtual application, with the processing tools offered by 00F2 software, in order to study the microstructural changes...
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(纸本)9783037857861
In this paper we analyzed the displacement and the deformation of grains and grain boundaries in a virtual application, with the processing tools offered by 00F2 software, in order to study the microstructural changes that occurs on stamping of the 38MoCrAl09 STAS791/88 steel, (equivalent with W.18507, DIN 17210-69 type 34CrAlMo5).
Using object-oriented programming (OOP) techniques and philosophies, a collection of C++ tools for the rapid development of finiteelement applications has been created. The object-oriented finite element analysis (OO...
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Using object-oriented programming (OOP) techniques and philosophies, a collection of C++ tools for the rapid development of finiteelement applications has been created. The object-oriented finite element analysis (OOFEA) toolkit provides both the geometrical and mathematical management tools necessary for this task in the form of useful class hierarchies. In particular, the OOFEA toolkit features methods for evaluating arbitrary weak forms provided by the user in order to solve particular problems of interest. A description of the underlying concepts, philosophies and techniques used to develop the toolkit are included. A strong effort has been made to concentrate on its possibly beneficial usage in the computational fluid dynamics area. In order to demonstrate the toolkit capabilities of managing complex projects, a simulator for laminar and turbulent natural convective flows in enclosures has been developed and a numerical study of some of these flows has been conducted. Using a primitive variable approach, the Galerkin FEM is used to obtain the weak form of the coupled unsteady Navier-Stokes and energy equations for incompressible, viscous, Newtonian fluids in two and three dimensions. By including a k-epsilon turbulence model in the governing equations, the analysis of both laminar and turbulent convective flows in enclosures is possible. With the help of a semi-implicit time stepping scheme, combined with a projection scheme, the resulting systems of equations are solved iteratively using the preconditioned conjugate gradient (PCG) algorithm. Time accurate two-dimensional simulations have been performed for a differentially heated square cavity in the laminar and turbulent regimes, for air with a Prandtl number of 0.71, and values of the Rayleigh number ranging between 10(3) and 10(10). Consistency tests show that the simulator correctly implements the k-epsilon turbulence model, and the numerical results compare well with results reported in the literature. T
Thermomechanical simulation of quenching, hot stamping, and quenching and partitioning processes of a high-strength TRIP-assisted steel were carried out in a Gleeble (R) 3S50 thermo-mechanical simulator, coupled to th...
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Thermomechanical simulation of quenching, hot stamping, and quenching and partitioning processes of a high-strength TRIP-assisted steel were carried out in a Gleeble (R) 3S50 thermo-mechanical simulator, coupled to the synchrotron X-ray diffraction line. The microstructures and mechanical properties were analyzed using Field Emission Gun Scanning Electron Microscopy (FEG-SEM), X-ray diffraction, and nanoindentation. The microstructures of thermomechanical treated specimens were modeled using the objectorientedfiniteelement (OOF) technique. The modeled microstructures were then fed into a finiteelement model to predict the mechanical behavior. By using a reverse algorithm method, the elastoplastic mechanical properties of different microconstituents were determined. This was done through the analysis of instrumented nanoindentation loading-penetration curves, Tensile properties of the thermomechanical processed steels were measured by tensile testing of subsized specimens cut from samples processed on the Gleeble (R) 3S50. The comparison between the experimental results and those of the reverse algorithm and the OOF modeled microstructure showed quite good agreement. (C) 2016 Elsevier B.V. All rights reserved.
finiteelement modelling (FEM) is performed on AlN-TiN composites. The structure-property relationships are studied for 5 and 10vol.% TiN composites in view of thermal and thermo-mechanical properties. Thermal stresse...
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finiteelement modelling (FEM) is performed on AlN-TiN composites. The structure-property relationships are studied for 5 and 10vol.% TiN composites in view of thermal and thermo-mechanical properties. Thermal stresses are simulated at various temperatures for the 5 and 10% TiN samples in homogeneous and heterogeneous temperature environments. It is found that compressive stresses are associated with the microstructure and these stresses are largest at the interface of the AlN-TiN phases. In addition, thermal strains are simulated at various temperatures for both the compositions. Thermal conductivity and thermal expansion coefficient are estimated using FEM and compared with other known analytical methods.
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