Determination of Thermal Boundary Conditions for Modeling the Hot Roll Bonding Process

Alina Melzner; Gerhard Hirt

doi:10.4028/www.scientific.net/KEM.651-653.1357

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 651-653Determination of Thermal Boundary Conditions for...

Determination of Thermal Boundary Conditions for Modeling the Hot Roll Bonding Process

Abstract:

Innovative product characteristics can be realized by hot roll bonding of two or more layers of different materials. To optimize the roll bonding process, an approach to align the strength differences in both materials by a temperature difference between the layers has been proposed. Therefore, the temperature distribution has to be investigated by finite element (FE) simulations. In these simulations the heat transfer coefficient (HTC) between the two aluminum layers is of great importance. With this coefficient the temperature transfer between the two layers can be determined in order to estimate the temperature field and the material strength difference in the layers.In hot roll bonding there are two ranges for the HTC depending on whether bond formation takes place or not. This effect can be used to determine at which pressures bond formation starts. To evaluate the HTC for this application and to determine its value ranges, a simple setup has been developed. This setup allows conducting experiments under defined temperature and pressure conditions. The resulting force-time measurements were used as input values for inverse FE-simulations, with the goal to gather the HTC by inverse modelling the temperature distributions of the specimens. First results show that the range of the pressure dependent HTCs leads up to 21 kW/(m²K) in the unbonded range. In the range where bonding occurred between the specimens, values over 150 kW/(m²K) were estimated. The data for the HTC was implemented in roll bonding simulations as an interaction property. A comparison between the simulated temperature curve and a measured temperature curve during roll bonding showed a good agreement between the temperature values.

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Periodical:

Key Engineering Materials (Volumes 651-653)

Pages:

1357-1362

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.651-653.1357

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Online since:

July 2015

Authors:

Alina Melzner*, Gerhard Hirt

Keywords:

Aluminium, Heat Transfer Coefficient, Inverse Analysis, Roll Bonding

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* - Corresponding Author

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