Because of their low density fiber reinforced polymers play an important role in lightweight constructions. For the development of simulation models it is therefore necessary to get a thorough knowledge of the material properties of fibers, matrix and the fiber-matrix interface. The material under investigation is a discontinuous glass fiber reinforced sheet-molding-compound (SMC) with a thermoset matrix material consisting of unsaturated polyester polyurethane hybrid (UPPH) intended for automotive applications.
The matrix behavior of the UPPH is determined from tensile tests on neat matrix specimens and nanoindentation experiments and simulations on the composite. Beside the characterization of the fibers and the matrix material it is also important to characterize the interface. Therefore single-fiber push-out tests are performed on the composite material. Simulations of the push-out test are conducted to determine interface parameters of a cohesive zone model. The simulation model is rebuilt from the experimentally observed microstructure.