Accession Number : AD0770547

Title :   Further Research on Predicting the Rain Erosion Resistance of Materials.

Descriptive Note : Final summary rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : Conn,Andrew F. ; Rudy,S. Lee

Report Date : MAY 1972

Pagination or Media Count : 116

Abstract : The latest results from a study of the dynamic behavior of rain erosion resistant materials are described. The basic dynamic properties of candidate rain erosion resistant coatings and substrates have been measured and then correlated with rain erosion observations. It is shown that a fatigue type of behavior, already found to be applicable for an acrylic plastic, may also be used to describe the rain erosion resistance of elastomeric coatings such as AFML polyurethane, and the glass fiber reinforced epoxy composite substrates which are frequently used for radome construction. The importance of the 'dynamic recovery rate' of materials, and of stress wave interactions, in understanding the rain erosion phenomenon is described in this report. The applicability of the elastic-plastic, uniaxial stress wave theory for making rain erosion predictions is also discussed. (Author)

Descriptors :   *Organic coatings, *Rain erosion, Stresses, Fracture(Mechanics), Polyurethane resins, Epoxy coatings, Stress strain relations, Fatigue(Mechanics), Impact, Predictions, Glass reinforced plastics, Stainless steel, Aluminum, Interfaces, Aircraft, Radomes

Subject Categories : Coatings, Colorants and Finishes
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE