Evaluation of Ice-Adhesion Strength on Erosion-Resistant Materials

Soltis, Jared; Palacios, José; Eden, Timothy J.; Wolfe, Douglas E.

doi:10.2514/1.j053516

Cited by 44 publications

(27 citation statements)

References 10 publications

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“…With decrease in the ambient temperature, the ice adhesion strength increases with an approximately linear dependence for an uncoated surface and the coating samples A and B . These trends are similar to that of previous studies on hydrophobic surfaces (Soltis and others, 2015; Janjua, 2017). The reason for this may be the fracturing of ice from these substrate surfaces through a combination of adhesive and cohesive breaks, based on the residual ice observed on the surfaces of the uncoated surface and coating A at all five testing temperatures and that observed from −20°C on coating B samples, as shown in Figure 6.…”

Section: Resultssupporting

confidence: 92%

Anti-icing performance of hydrophobic material used for electromechanical drill applied in ice core drilling

et al. 2020

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Using an anti-icing coating to prevent ice accretion on the drill surface is a feasible solution to address the drilling difficulties in warm ice. In this study, four types of commercially available hydrophobic coating materials were tested to evaluate their water repellency and anti-icing properties, namely, a mixture of silica and fluorocarbon resin with polytrifluoroethylene, modified Teflon, silica-based emulsion and an acrylic-based copolymer. Their water contact angles are ~107°, 101°, 114° and 95°, respectively. All these hydrophobic coatings can significantly reduce the strength of the ice adhesion within a temperature range of −10 to −30°C on a planar or curved surface. The coating of an acrylic-based copolymer, in particular, can reduce the average tensile strength and the shear strength of the ice adhesion by 87.08 and 97.11% on planar surfaces at −30°C, and by 98.06 and 96.15% on a curved surface, respectively. The main challenge in the practical application of these coatings is their durability. An acrylic-based copolymer coating will lose its water repellency performance after 140 cycles of abrasion. The shear strength of ice adhered on curved surfaces coated with this material will approach that achieved on uncoated surfaces after 11 cycles of icing and de-icing tests.

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Section: Resultssupporting

confidence: 92%

Anti-icing performance of hydrophobic material used for electromechanical drill applied in ice core drilling

et al. 2020

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“…The ice adhesion strength has been studied over the past 70 years through different types of mechanical testing configurations, including push-out, direct shear, cylindrical twist of normal interface, and centrifuge configuration [8][9][10][11][12][13][14][15][16]. The differences in experimental measurement techniques can be grouped into two major categories based on the application of the peel-off force; (a) centrifuge and vibration tests [17][18] to shear off the interface via centripetal forces or vibrational amplitude, and (b) direct mechanical tests such as 0° cone test (similar to the push-out configuration), and direct shear configuration [11,[19][20]. In addition, water contact angle measurements have been widely used to estimate ice adhesion and have shown a good correlation between water wettability and adhesion strength [21].…”

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confidence: 99%

Characterization of Ice Adhesion: Approaches and Modes of Loading

Dawood

Yavas

Giuffre

et al. 2020

Aiaa Aviation 2020 Forum

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Airborne structures are vulnerable to atmospheric icing in cold weather operation conditions. Most of the ice adhesion-related works have focused on mechanical ice removal strategies because of practical considerations, while limited literature is available for a fundamental understanding of the ice adhesion process. Here, we present fracture mechanics-based approaches to characterize interfacial fracture parameters for the tensile and shear behavior of a typical ice/aluminum interface. An experimental framework employing single cantilever beam, direct shear, and push-out shear tests were developed to achieve near mode-I and near mode-II fracture conditions at the interface. Both analytical (beam bending and shear-lag analysis), and numerical (finite element analysis incorporating cohesive zone method) models were used to extract mode-I and II interfacial fracture parameters. The combined experimental and numerical results, as well as surveying published results for the direct shear and push-out shear tests, showed that mode-II interfacial strength and toughness could be significantly affected by the test method due to geometrically induced interfacial residual stress. As a result, the apparent toughness of the zeroangle push-out test could reach an order of magnitude higher than those derived from direct shear tests. Moreover, it was found that the interfacial ice adhesion is fracture mode insensitive and roughness insensitive for tensile and shear modes, for the observed modes of failures in this study Disciplines Disciplines Aeronautical Vehicles | Structures and Materials Comments Comments

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“…shapes have much larger overhang on some centrifuge tests than rime conditions, which likely skewed the data to show the trend more strongly [123,156].…”

Section: Comparison Of Methodsmentioning

confidence: 99%

“…Tabor which showed linear trends with temperature in some of their data sets [147]. While this trend shows up in some newer publications [156], it is hardly universal. In both sets of data, a small upward trend is shown on average, but the fit to the data is poor.…”

Section: Comparison Of Methodsmentioning

confidence: 99%

The measurement of the adhesion of glaze ice.

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Icing is a lethal and costly aviation hazard affecting aircraft of all sizes ranging from small UAVs to large commercial craft such as the Boeing 787, resulting in hundreds of deaths over the last century and resulting in billions of dollars of economic impact. Three predominant types of icing, namely, airframe icing, engine icing, and rotorcraft icing, dominate aircraft icing research. Each type poses unique challenges. In the case of rotor icing, attention needs to give to the rotating environment with large oscillatory loads and icing conditions. In the case of airframe icing, special attention needs to be paid to a variety of loading cases from the available options for de-icing and anti-icing equipment. In the case of engine icing, the formation mechanism is poorly understood and the structure of the ice needs to be studied in greater detail. Airframe icing requires However, all three share the same fundamental problem that ice sticks to surfaces. How strongly ice adheres to a surface dictates how hard it is to remove. The adhesion strength then regulates the primary threat from icing-the maximum aerodynamic penalty that accretion will have. It also dictates the threat of impingement from shed ice elsewhere on the aircraft, such that a piece of ice from the main rotor could strike the tail rotor on a helicopter, destroying it.

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Evaluation of Ice-Adhesion Strength on Erosion-Resistant Materials

Cited by 44 publications

References 10 publications

Anti-icing performance of hydrophobic material used for electromechanical drill applied in ice core drilling

Anti-icing performance of hydrophobic material used for electromechanical drill applied in ice core drilling

Characterization of Ice Adhesion: Approaches and Modes of Loading

The measurement of the adhesion of glaze ice.

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