ENVIRONMENTAL EFFECTS ON SPACE STRUCTURES.
LOCKHEED MISSILES AND SPACE CO SUNNYVALE CALIF
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This report presents current estimates of the nature and magnitude of environmental effects caused by space vacuum, radiation, and meteoric particles on spacecraft structures. Methods to counteract the deleterious effects of the space environment on spacecraft structures and their contents are discussed and preferable ones recommended. There are varying degrees of uncertainty concerning the various phases of space environment and the methods to meet these hazards. Space vacuum effects are well understood and do not appear to offer any serious problems except to exposed mechanisms. Radiation effects are well understood and are predictable for any given exposure. Future improvements can be expected in the definition of intensity and frequency of natural radiation sources. Improvements should be expected in the meteoric penetration theory, a laboratory confirmation of the tentative hydrodynamic penetration of Bjork would be welcome. A firmer definition of the velocities, densities, and massto-number distribution of the flux can be anticipated. Reduction of these uncertainties will place meteoroid penetration prediction on a firmer base. Protection systems may take a turn toward self-sealing systems in the future. Author