Alasvand Zarasvand, Kamran, Yang, Qimeng, Choudhury, Mahin, Harvey, Derek, Momen, Gelareh et Golovin, Kevin.
2026.
« Substrate and geometric effects in the evaluation of low interfacial toughness icephobic coatings ».
Applied Materials Today, vol. 52.
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Résumé
Ice detachment from coatings exhibiting a low interfacial toughness (LIT) with ice is often studied using flat shear tests, although many real applications involve curved structures where the substrate itself may change the stress state and affect how ice delamination occurs. We compare various techniques for evaluating the adhesion between ice and a LIT material to examine whether any method truly captures the performance of the ice/coating interface. Using ultra-high molecular weight polyethylene as the representative LIT coating for all tests, push-off results show a clear transition from strength-controlled to toughness-controlled detachment, and this behavior remains unchanged across substrates with very different stiffness and thermal conductivity. Centrifuge adhesion tests (CAT) on the same LIT material result in the same trend, validating that flat substrate evaluation reflects the behavior of the ice/coating interfacial delamination. Importantly, wind-tunnel spin-rig tests on curved surfaces also follow the same overall trend, showing that the transition from a strength to toughness-controlled regime persists even under more complex geometries and non-bulk-ice accretion conditions closer to practical icing environments. In contrast, the zero-degree cone test (ZDCT) gives very different results. Even with the same coating and icing conditions, the measured detachment behavior changes strongly with substrate stiffness, rod radius, and ice thickness. We derive a mechanical model which shows that, in the toughness-controlled regime, the detachment force scales with rod radius as R3/2, in good agreement with experiments. Consistent with the ZDCT results, spinning rotor blade (SRB) tests also show clear substrate-compliance effects, indicating that detachment from these curved, flexible structures is influenced by the mechanics of the entire system rather than only the ice/coating interface. These findings validate that interface-dominated LIT behavior can be characterized using several test geometries and even rime ice, but certain geometric properties of the test must be fulfilled to ensure the evaluation is of the interface, rather than the entire system. The push off, CAT, and spin-rig devices show substrate-independent, interface-dominated detachment behavior, whereas curved and flexible configurations like the ZDCT and SRB measure the de-icing response of the entire system, dependent on size, substrate, and curvature.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Chercheur(-euse): | Chercheur(-euse) Momen, Gelareh |
| Affiliation: | Génie aérospatial |
| Date de dépôt: | 09 sept. 2026 15:25 |
| Dernière modification: | 26 sept. 2026 19:23 |
| URI: | https://espace2.etsmtl.ca/id/eprint/34318 |
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