Rain Erosion Resistance of Materials for Forward Looking Infrared Windows.
Abstract
This report summarizes the theory and data which has been compiled to date on the rain erosion resistance of Zinc Sulfide, Zinc Selenide and Gallium Arsenide. In addition, it formulates a method by which the usefulness of these and other IR materials in operational systems can be predicted. A review of available test data and theoretical analyses leads to the formulation of a method for predicting the rain erosion resistance of infrared window materials. Mathematical modeling of rain drop impact phenomena is used to provide a prediction of maximum tensile stress in any material as a function of impact angle, drop size and velocity. Incubation time is then estimated as a function of rain rate by correlation of test data with stress predictions. Computations are completed and results presented for the Pave Tack Zinc Sulfide Window. More experimental data is necessary before predictions can be made for Gallium Arsenide and Zinc Selenide windows.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1978
- Accession Number
- ADA096899
Entities
People
- Douglas W. Amlin