Project Details
Projekt
Material characterization and material modelling of composite-metal sheets
Subject Area
Plastics Engineering
Term
from 2012 to 2015
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 231907776
The Characterization of material properties for hybrid laminates, consisting of metal and composite material, plays an essential role in designing simulation models for thermoforming processes. In this case material properties have to be determined for the metal sheet as well as for the sheets of composite material. Standard material tests for different load conditions are carried out according to the testing specifications of sheet metals and composite materials. Tests under different stress conditions and the influence of both various strain rates and temperatures are planned. In addition friction co-efficients at different temperatures are to be determined by means of a strip-draw-test with deflection. Based on the material characterization a coupled simulation model for metals and composite materials is developed in order to describe the forming process of the hybrid laminate. With regard to the finite element simulation it is a challenging task to model different forming behaviours as a function of temperature for both components especially at the interface of metal and composite material. Furthermore different coefficients of thermal expansion induce a complex toad condition at the interface during the forming process. For the buildup of the numerical calculation model research institute (1) and (2) rely on their competences in the fields of sheet metal forming simulations and fibre reinforced plastics. To validate the developed numerical method simplified model experiments which include the variation of relevant process parameters are conducted in TP4. The simulation models can be extended with regard to damage behaviour of hybrid laminates dependent on the experimental results.
DFG Programme
Research Grants
