Investigation into the Shear Strength of Ice

摘要

For future cryogenic fuelled aircraft, employing an intake heat exchanger, icingof the heat exchanger could be a problem. Previous work suggested that on copper at low temperatures, the shear strength of ice reaches zero. Thus the shear strength of ice adhered to various metal and non metal, slightly roughened, plate surfaces was investigated in the temperature range from 0 C until the bond shear strength reached zero. The water drops being initially placed on and removed with the plate temperature constant. Later drops were placed with the plate at 0 C and then cooled to the required temperature. Finally, photographs were taken of the regions from which the drops were removed. It was found that water droplets would not remain adhered to the surface of a metal heat exchanger. It was also found that for common application and removal temperature, for metals, at any temperature below a given point, the shear strength is a linear function of the difference in linear expansivities of ice and the metal. At temperatures above this critical point, the shear strength is dependent on the strength of the interface layer between the ice and plate material.