Browse Publications Technical Papers 2019-01-1947

Characterization of Mode-II Interfacial Fracture Toughness of Ice/Metal Interfaces 2019-01-1947

Airborne structures are vulnerable to atmospheric icing in cold weather operation conditions. Most of the ice adhesion-related work have focused on mechanical ice removal strategies because of practical considerations, while limited literature is available for fundamental understanding of the ice adhesion process. Here, we present a fracture mechanics-based approach to characterize interfacial fracture parameters for the shear behavior of a typical ice/aluminum interface. An experimental framework employing shear push-out test was developed to achieve mode-II fracture conditions at the interface. Both analytical (shear-lag analysis) and numerical (finite element analysis incorporating cohesive zone method) models were used to extract mode-II interfacial fracture parameters. The combined experimental and numerical results, as well as surveying published results for zero angle push and shear lap tests showed that mode-II interfacial strength and toughness can be significantly affected by the method of testing due to geometrically induced interfacial residual stress. As a result, the apparent toughness of zero angle pushout test could reach an order of magnitude higher than those derived from shear lap tests.


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