Characterization under multimodal stress

Metamaterials are interesting for industrial applications due to their high strength at low weight and the principle of tuning the mechanical parameters depending on the arrangement and frequency of different unit cells. However, the characterization of metamaterials is much more complex than for standardized samples due to the coupling of structural and material behaviour. 

Therefore, a multimodal test method is developed to characterize the damage behavior and potential localization of the damage of complex structures. In particular, fatigue tests are carried out on metamaterials on different size scales under specifically set load conditions with acoustic and electrical characterization accompanying the test in order to be able to predict the service life non-destructively in future industrial applications and identify critical, already damaged areas.