Accession Number : ADA196269

Title :   Nondestructive Evaluation of Moisture Intrusion in Missile Components.

Descriptive Note : Final rept. Jun 86-Sep 87,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Pomerening, Daniel J. ; Green, Steven T.

Report Date : 25 SEP 1987

Pagination or Media Count : 78

Abstract : Field return data for the SPARROW III/AIM-7 missile have indicated that moisture intrusion into the target seeker has occurred. A program was initiated to determine the controlling parameters in the moisture intrusion problem and develop recommendations for modifications to the design of the seeker section. Testing was performed to determine parameters associated with target seeker geometry. Using the test results, a thermodynamic model of the system was developed which allowed for simulation of a variety of environmental conditions and geometry changes. The results indicated that the driving factors in the level of moisture intrusion were the rate of change of environmental temperature, the leakage path area, and significant differences between the thermal response of the electronics packaged and the outer shell. It was possible to match the results of the thermodynamic model with those of the experiments. Proposed modifications to the target seeker were made and results checked with the thermodynamic model. Areas requiring additional testing and analysis are discussed. Keywords: Air to air missiles; Leakage(Fluid); Guided missile components; Humidity testing; Thermodynamic model. (edc)

Descriptors :   *AIR TO AIR MISSILES, ELECTRONICS, ENVIRONMENTS, GUIDED MISSILE COMPONENTS, HUMIDITY, LEAKAGE(FLUID).

Subject Categories : Air- and Space-launched Guided Missiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE