TOFAS FIAT

Bursa, Turkey

TOFAS FIAT

Bursa, Turkey
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Ergul E.,Abant Izzet Baysal University | Doruk E.,TOFAS FIAT | Doruk E.,Sakarya University | Pakdil M.,Abant Izzet Baysal University
Steel and Composite Structures | Year: 2017

It is extremely important to be aware of the ballistic performances of engineering materials in order to be able to choose the lightest armor providing full ballistic protection in civil and military applications. Therefore, ballistic tests are an important part of armor design process. In this study, ballistic performance of plates made of carbon steel and cold worked tool steel against 7.62 mm AP (armor-piercing) bullets was examined experimentally and numerically in accordance with NIJ standards. Samples in different sizes were prepared to demonstrate the effect of target thickness on ballistic performance. Some of these samples were coated with titanium nitride using physical vapor deposition (PVD) method. After examining all successful and unsuccessful samples at macro and micro levels, factors affecting ballistic performance were determined. Explicit non-linear analyses were made using Ls-Dyna software in order to confirm physical ballistic test results. It was observed that the ballistic features of steel plates used in simulations comply with actual physical test results. Copyright © 2017 Techno-Press, Ltd.


Doruk E.,TOFAS FIAT | Doruk E.,Sakarya University
Steel and Composite Structures | Year: 2017

Due to the increasing competition, automotive manufacturers have to manufacture highly safe and light vehicles. The parts which make up the body of the vehicle and absorb the energy in case of a crash, are usually manufactured with sheet metal forming methods such as deep drawing, bending, trimming and spinning. The part may get thinner, thicker, folded, teared, wrinkled and spring back based on the manufacturing conditions during manufacturing and the type of application methods. Transferring these effects which originate from the forming process to the crash simulations that are performed for vehicle safety simulations, makes accurate and reliable results possible. As a part of this study, firstly, the one-step and incremental sheet metal forming analysis (deep drawing + trimming + spring back) of vehicle front bumper beam and crash boxes were conducted. Then, crash performances for cases with and without the effects of sheet metal forming were assessed in the crash analysis of vehicle front bumper beam and crash box. It was detected that the parts absorbed 12.89% more energy in total in cases where the effect of the forming process was included. It was revealed that forming history has a significant effect on the crash performance of the vehicle parts. © 2017 Techno-Press, Ltd.


Yildizhan M.,TOFAS FIAT | Efendioglu B.,TOFAS FIAT | Kaya N.,Uludag University | Ozturk I.,Uludag University | And 2 more authors.
International Journal of Vehicle Design | Year: 2016

In this paper, design and analysis of improved energy absorbing pads, which are widely used for reducing occupants' injury in case of side impact, are presented to minimise the side impact effects on occupants. This research is part of an ongoing vehicle design and development project to reduce the vehicle development time and cost by using energy absorbing pads to improve the passive safety for side collisions and to reduce the injuries without further increasing weight of the vehicle. The use of energy absorbing pads, especially in side impact, has been increasing significantly for the last decades. The energy absorption capacity and lightweight material specifications of expanded polypropylene (EPP) and polypropylene (PP) are major characteristics that make the use of these pads in automotive industry. The present approach is employed to design improved energy absorbing pads using different materials and introducing material model selection, modelling, simulation and validity studies. Copyright © 2016 Inderscience Enterprises Ltd.


Korkmaz I.,TOFAS FIAT
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 | Year: 2010

In this research the utilization of distributed, lumped, and consistent mass models in the dynamic analysis of structures is studied, and the results obtained by these models for example problems are compared. In distributed mass model, the dynamic stiffness matrix for a planar beam element is derived by integrating the differential equations of motion. In lumped mass model, the mass of the structure is lumped at the nodal points where translational displacements are defined. However, in the consistent mass model the mass characteristics corresponding to the nodal coordinates of beam element are evaluated by a procedure similar to the determination of the element stiffness coefficients. These mass models are executed for three numerical examples. Results of two examples are compared with analytical solutions. The last example analysis of planar frames with distributed mass model is calculated with using a developed computer program by using two comparison results of other examples. The Fourier series approach is used for the solution of dynamic equations. Numerical results have shown the effectiveness of the dynamic stiffness approach with the distributed mass model. The distributed mass model gives the exact values of the natural frequencies with the exception of numerical errors in computer calculations. This research is different from the other studies that demonstrate the application of the modeling and calculation of the natural frequency values' accuracy regarding to choose mass model. It is also shows the method to deal with the external excitation. Copyright © 2010 by ASME.


Pir F.,Uludag University | Albak E.,Uludag University | Ozturk F.,Uludag University | Kaya N.,Uludag University | Korkmaz I.,TOFAS FIAT
International Journal of Vehicle Design | Year: 2016

Recently, the research work for the improvement of the ride comfort quality and dynamic characteristics for vehicle handling performance is taking increasing attention. Although much work has been done on numerical and experimental studies to improve the ride quality and dynamic characteristics, many applications face limitations with respect to conflict between ride comfort and vehicle handling, which mostly depend on the suspension characteristics. This research presents an integrated model-based approach to design optimised suspension systems to improve vehicle dynamics behaviour and to eliminate the drawbacks of physical testing and reduce the cost. This paper is about the part of an ongoing research on vehicle ride comfort and handling optimisation, and integrated full vehicle model design and model validation studies are given in this paper. The optimisation model will be presented in another paper to choose a compromise solution between ride comfort and handling performance. Copyright © 2016 Inderscience Enterprises Ltd.


Durgun I.,TOFAS FIAT | Altinel S.A.,TOFAS FIAT | Aybaraz E.,TOFAS FIAT | Sakin A.,TOFAS FIAT | Polat E.,TOFAS FIAT
Materialpruefung/Materials Testing | Year: 2014

Intense competitive environment and customers' changing demands and needs apply temporal and financial pressure to product development process. For this reason interest in design and innovation is inevitable. Reducing project duration also affects further applications as well as new tooling materials and methods become more important to catch up project schedule. Conventional methods of stamping process usually do not suit to prototype or low volume production in terms of project schedule and cost. In this study a polymer metal carcass die structure was introduced in order to stamp large sheet metal prototype parts. Dimensional conformance of prototype sheet metal parts was compared with actual production and as a result polymer metal carcass die method is an effective method for prototype sheet metal parts to meet the tolerance interval. Therefore, this method is cost effective and helps to meet the project schedule in time. © Carl Hanser Verlag, München Materials Testing.

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