Simulation-Based Developement of Components Made of Thermal Conductive Polymers
Adding heat-conductive fillers modifies plastics‘ properties of heat conductivity. As a result, in addition to their mechanical and electrical insulation functions, these materials can assume a function in thermal management, by e.g. replacing metal cooling structures in assembly groups of LED lighting. This thesis presents the experimental investigations undertaken on the interrelations between structure and properties. They show that filler orientation, filler degradation and filler deformation are the main factors to determine the heat conductivity of a moulded part, thus making it clear that heat conductivity is a process-related anisotropic material property. In order to conduct targeted simulation-aided component design with heat-conductive plastics, it is essential for the designer to know these influencing factors and use the right material properties in the calculations. A demonstrator designed for LED cooling serves as an example to show that the known guidelines of thermodynamic component design need to be altered and adjusted, if heat-conductive plastics are used.
To predict the heat conductivities of filled plastics, a variety of analytical as well as numerical calculation methods is available. The investigations showed that the question as to which of the methods is best suited is determined by the respective phase of product development. While analytical models enable easy, though less precise, material calculation in the early phases, homogenization methods are superior when complex influences from production and material composition are to be represented. This allows for integrative procedure in product development and can replace expensive experimental cycles of material development. Based on the investigations, a systematic procedure of product development could finally be conducted.Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
hermal conductive polymer, LED cooling, material simulation, meanfield homogenization, injection moulding, product developement
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Technical consultant for expert services: Prof. Dr.-Ing. Dietmar Drummer (Betreuer), Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein, Prof. Dr.-Ing. Volker Altstädt
Publication year: 2012
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de
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