Fiat Automoveis

Dias, Brazil

Fiat Automoveis

Dias, Brazil
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Garcia O.L.,Fiat Automoveis | Ferreira R.F.,Fiat Automoveis | Olalla V.C.,Ghent University | Petrov R.,Ghent University
SAE Technical Papers | Year: 2014

The work-hardening of three common automotive low carbon steel sheets is described in terms of two different types of microstructure based models. The first model employed is the classical Kocks-Mecking model. On the other hand, the second model incorporates the effect of the density evolution of non-redundant dislocations, also known as Geometrically Necessary Dislocations (GND), into the Kocks-Mecking hardening law. Each of both models was coupled to a Taylor-type crystal plasticity framework in order to follow the dislocation density evolution over all slip systems. One of the microstructural parameters employed on the calibration of the second model is the density of GND, parameter which was experimentally acquired from crystal orientation maps by EBSD (Electron Backscatter Diffraction) on the tensile samples. Both models displayed satisfactory results on describing the experimental work hardening behavior of the steel sheets, despite the classical Kocks-Mecking showed a better fitting to the stress-strain curve. Finally, the work hardening description was evaluated by comparing the present models with the empirical equations of Hollomon and Ludwik. Copyright © 2014 SAE International.

De Carvalho Moura F.L.,FIAT AUTOMOVEIS | Takemori C.K.,Vibroacustica | Baars E.,Vibroacustica | Ribeiro S.,Vibroacustica
SAE Technical Papers | Year: 2014

Currently the numerical simulations of the vibro-acoustic behavior of vehicles are built considering only major structures, such as its basic structure (body in white), doors, dashboard etc. To take into account the contribution of other components (such as trims, seats, sound insulation etc.) to the overall response of the model, the average characteristics of these materials are inserted globally in this model. However, for more correlated models is necessary to consider local characteristics of these components. This work presents the numerical procedure for simulating the effect of the structural damping of viscoelastic coatings and the acoustic absorption of the trims such that its effects can be considered in the model of the full vehicle. The operating forces applied to the model were estimated from the laboratory and road tests using the SPC/TPA technique. Furthermore, the model enables the subjective evaluation of the noise from the auralization/synthesis based on numerical frequency response functions and road test data. Copyright © 2014 SAE International.

De Carvalho Moura F.L.,FIAT AUTOMOVEIS | Ferreira T.S.,FIAT AUTOMOVEIS | Costa R.G.,FIAT AUTOMOVEIS | Takemori C.K.,Vibroacustica | Baars E.,Vibroacustica
SAE Technical Papers | Year: 2014

Currently, the simulation models in acoustics and vibrations are built considering only the main structures of the vehicle, as its basic structure (Body-in-white, BIW), doors, dashboard, and so on. To take into account the contribution of components with less influence (such as carpets, seats, sound insulation, and so on) in the behavior of the overall response of the model, the average characteristics of these materials are inserted evenly distributed in these models. However, to obtain models with better correlation levels is necessary to consider local characteristics of the application of these components. In this work was developed and numerically validated, the model that describes the standardized test of "Oberst Beam" (ASTM E 756-98) to obtain the damping of the blankets used for damping of the panel vibration. With these characteristics, in future work, is expected to be possible, also with a good correlation, consider the effect of these materials on whole vehicle. Copyright © 2014 SAE International.

Vieira A.L.,ABCz Design | Silveira M.E.,Federal University of Säo João del Rei | Pockszevnicki B.C.,TECPRON | Vera E.Q.N.,FIAT Automoveis
SAE Technical Papers | Year: 2011

External components of an automotive body are manufactured from a stamping of sheet metal plane resulting in a final product with variable thickness due to different levels of stretch and a heterogeneous distribution of residual plastic strain. Generally, these informations are not considered in numerical simulations of the product and may cause considerable errors in the analysis of stamped parts involving nonlinearities. This work aimed to simulate an event called palm-printing in an automobile fender, with and without the consideration of the final data of the numerical simulation of the stamping process (final thickness and residual plastic strain) and the results compared with those obtained experimentally. Results showed that the consideration of thickness and hardening from the stamping process can improve the correlation of final results in quasi-static nonlinear analysis. However, the results showed that the influence of the thickness reduction is so important as the hardening, especially in the correlation of the reaction force of the indenter, contrary to reports in the literature in cases of crash test simulation. Copyright © 2011 SAE International.

Purcenoa A.,Techmall | Duarte M.,Fiat Automoveis | De Melo Costa L.C.,Connexio Consultoria | Bueno S.P.,Unilever | And 2 more authors.
Quimica Nova | Year: 2016

In this work, chemists with experience in different areas of industry and academy raised some important issues in career planning to help undergraduate chemistry students to get prepared for the future professional life.

de Almeida Souza Torres C.E.,Petrobras | Costa C.G.F.,Federal University of Minas Gerais | Pereira A.P.,Fiat Automoveis | de Castro M.D.M.R.,Federal University of Minas Gerais | de Freitas Cunha Lins V.,Federal University of Minas Gerais
Engineering Failure Analysis | Year: 2016

The search for alternative forms of energy that generate a lower emission of carbon dioxide and pollutants leads to an increase in biodiesel fuel production in Brazil. The corrosion of steel equipment is a major problem in biodiesel fuel plants. The methodology applied in the research includes a survey of operating conditions and failure history as well as collection and analysis of corrosion data obtained in installing AISI 316L electrical resistance probes at strategic points in the process. © 2016 Elsevier Inc.

Petracconi C.L.,Fiat Automoveis | Ferreira S.E.,Fiat Automoveis | Palma E.S.,Pontifical Catholic University of Minas Gerais
Engineering Failure Analysis | Year: 2010

A comparison between laboratory test data on fatigue crack nucleation in a rear tow hook pin assembly of passenger vehicle and a computational methodology using commercial package software is presented. Fatigue damage is determined using local material response, measured during experimental tests. Experiments were performed simulating the actual conditions in the customer environment. Stress and strain were experimentally measured by using strain gages, bonded on the hook assembly. These experimental lives are compared with those obtained through numerical analysis using a commercial fatigue software. Fatigue analysis methods (S-N curves, rainflow counting and Miner rule) were used to determine the fatigue damage imposed on the component. Interpretation and evaluation of the measured strain and stresses, simulation tests and fatigue life assessments, on the basis of S-N curve, are described in this paper. © 2009 Elsevier Ltd. All rights reserved.

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