Measured Interfacial Residual Strains Produced by In-Flight Ice 2019-01-1998
The formation of ice on aircraft is a highly dynamic process during which ice will expand and contract upon freezing and undergoing changes in temperature. Finite Element Analysis (FEA) simulations were performed investigating the stress build up in a simplified case with uniform temperature changes between an idealized ice sample and acrylic substrate. These results were used to place strain gages on custom-built acrylic samples which were then placed in icing conditions such that ice was grown on top of the sample. Tee rosettes were placed in two configurations near thermocouple sensors. It was hypothesized that the ice would expand on freezing and contract as the temperature of the interface returned to the equilibrium conditions, however results show a short period of contraction followed by a much larger expansion at the interface, indicating more complex ice growth thermodynamics than anticipated.
Andrew Work, Jonathan Salem, Eric Baker, Ernestina Schirmer, Rebekah Douglass, Richard Kreeger
Ohio Aerospace Institute, NASA John Glenn Research Center, Connecticut Reserve Technologies, Purdue University, Penn State University
International Conference on Icing of Aircraft, Engines, and Structures