Probabilistic multiscale analysis for assessment of uncertainties from microstructure to structural level
Themes: Building & Construction, Leichtbau
Many modern composite materials feature a distinctively disordered microstructure. Relevant microstructural uncertainties range from uncertain fiber length and orientation in discontinuosly fiber reinforced materials over uncertainties in fiber density or tendencies towards fiber clustering in continuously fiber reinforced materials to uncertain cell sizes and shapes in structural foams. All these microstructural geometric uncertainties lead to material uncertainties and scatter in parameters on the material scale. The material uncertainties finally result in scatter in the structural response of the respective components. To assess the scatter in the structural response deriving from microstructural uncertainties on the material level, Fraunhofer IWM has developed and implemented a probabilistic hierarchical multiscale simulation procedure which allows the prediction and assessment of the uncertainties in the structural scale based on the known uncertainties in the material microstructure.