Surveys of Returned ISS Hardware for MMMOD ImpactsSince February 2001, the Hypervelocity Impact Technology (HVIT) group at the Johnson Space Center (JSC) in Houston has performed 35 post-flight inspections on space exposed hardware returned from the International Space Station (ISS). Data on 1,188 observations of micrometeoroid and orbital debris (MMOD) damage have been collected from these inspections. Survey documentation typically includes impact feature location and size measurements as well as microscopic photography (25-200x). Sampling of impacts sites for projectile residue was performed for the largest features. Results of energy dispersive X-ray spectroscopic analysis to discern impactor source are included in the database when available. This paper will focus on two inspections, the Pressurized Mating Adapter 2 (PMA-2) cover returned in 2015 after 1.6 years exposure with 26 observed impact features, and two Airlock shield panels returned in 2010 after 8.75 years exposure with 58 MMOD impacts. Feature sizes from the observed data are compared to predictions using the Bumper 3 risk assessment code.
Document ID
20170003824
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Hyde, J. L. (Barrios Technology, Inc. Houston, TX, United States)
Christiansen, E. L. (NASA Johnson Space Center Houston, TX, United States)
Lear, D. M. (NASA Johnson Space Center Houston, TX, United States)
Nagy, K. (NASA Johnson Space Center Houston, TX, United States)
Berger, E. L. (Jacobs Technology, Inc. Houston, TX, United States)