Characterization and modeling of creep in composite materials

© Fraunhofer IWM

Composite materials with a thermoplastic matrix have a range of attractive properties, but are subject to creep deformation at higher temperatures. The creep behavior of fiber-reinforced polymers can be determined in retardation trials under tensile, compressive and flexural loads in a controlled atmosphere (temperature and humidity) according to DIN EN 843. Displacement transducers or optical measuring techniques continuously measure sample deformation. The measurements are used to establish material models with which to describe the viscoelastic behavior in FEM analyses.