Czasopismo | HUTNIK - WIADOMOŚCI HUTNICZE | Rocznik 2017 - zeszyt 4

Identification of material model for Finite Element Modelling of quenching process

10.15199/24.2017.4.3

nr katalogowy: 105058
10.15199/24.2017.4.3

The paper concerns modelling of quenching process using the finite element method. The special emphasis is put on finding the proper material characteristics, in particular for heat transfer coefficient on solid-fluid contact boundary and heat conduction for fluid, in case of highly complex flow close to the solid-fluid boundary. Only heat transfer and fluid flow are considered with solid phase mechanical behaviour neglected. The paper presents an approximate numerical model of the process and technical means by which its implementation is realised. The included numerical examples show how the obtained model allows for fast approximate simulations of quenching.Introduction. Quenching of metals is difficult to model numerically due to the complex character of processes involved, that include multi-phase flows and heat exchange between different phases [2]. Accurate models that try to capture the physics of all these processes are difficult to apply in industrial practice due to excessive requirements of computational resources, related to the necessity of resolving different time scales (e.g. for turbulent flow just after submerging a metal in a cooling agent - with time steps in the range of milliseconds - and heat transfer in the later stages of the process - with time steps in the range of seconds), as well as space scales (thin boundary layers close to the solid-fluid contact surfaces and large dimensions of quenched objects and the machinery used for quenching). The difficulty is additionally augmented by the complex character of computational domains in typical engineering problems. Therefore significant simplifications and the use of experimentally obtained data is necessary in order to provide algorithms that perform simulations with demanded accuracy in a reasonable time. In the paper we propose a finite element model for quenching simulations. In the next section the mathematical model used in finite element simulati[...]

Bibliografia

[1] Banaś Krzysztof, Chłoń Kazimierz, Cybułka Paweł, Michalik Kazimierz, Płaszewski Przemysław, Siwek Aleksander. 2014. “Adaptive finite element modelling of welding processes". Lecture Notes in Computer Science 8500: 391-406. Springer International Publishing.
[2] Boer Claudio R., Rebello Nuno, Rydstad Hans, Schroder Gunther. 1986. Process Modeling of Metal Forming and Thermomechanical Treatment. Springer-Verlag.
[3] Buczek Andrzej, Telejko Tadeusz. 2004. “Inverse determination of boundary conditions during boiling water heat transfer in quenching operation". Journal of Materials Processing Technology, 155-156: 1324-1329.
[4] Franca Leopoldo P., Frey Sergio L. . 1992. “Stabilized finite element methods: II. The incompressible Navier-Stokes equations", Computer Methods in Applied Mechanics and Engineering, 99: 209- 233.
[5] Michalik Kazimierz, Banaś Krzysztof, Płaszewski Przemysław, Cybułka Paweł. 2013. “ModFem: a computational framework for parallel adaptive finite element simulations". Computer Methods in Materials Science 13 (1): 3-8.

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