A new method based on the shear lag model for accurate determination of ice adhesion shear strength on solid surface

Accurate measurement of the interfacial shear strength between ice and solid surface has important reference significance for the design of anti-icing and de-icing functional surfaces. In this paper, a new method is proposed based on the shear lag model of a single fiber pulled out from matrix, in order to accurately determine the interfacial shear strength (ISS) between ice and metals. The maximum pull-out force at the initiation of interface debonding is well measured in the pull-out test of a metal fiber embedded in an ice matrix. A shear lag model similar to the pull-out test is established and a closed-form relation between the non-uniform interfacial shear stress and the pull-out force is achieved. When the pull-out force reaches its peak value, the ice/metal ISS can be consequently determined as the maximum interfacial shear stress. Such a method takes into account the stress concentration at the interface, which overcomes underestimation of ice/solid ISS based on the apparent strength in previous studies. The achieved ISS is proven to not only have good convergence, but also be independent of the size and embedded depth of metal fibers. Based on the present method, the enhancing effects of freezing temperature and surface roughness on the ice adhesion are further disclosed. The present research provides a simple and reliable approach to accurately calibrate the ice/solid ISS, which should be of important reference significance for the design and assessment of anti-icing functional surfaces.