Material Degradation Monitor on ExHAM (ExHAM-MDM2) - 04.19.17

Overview | Description | Applications | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
Radiation, extreme temperatures and energetic particles all make space a dangerous place, but they can cause greater or lesser damage, depending on a spacecraft’s orbital location. The Exposed Experiment Handrail Attachment Mechanism-Material Degradation Monitor (ExHAM-MDM2) investigation studies materials that may be used in low-earth orbiting satellites, which would be exposed to harmful atomic oxygen in the uppermost layers of Earth’s atmosphere. Spacecraft materials are exposed to space, retrieved on the ground, and analyzed to measure how well they perform in the harsh environment of low-Earth orbit.
Science Results for Everyone
Initiation of this investigation has been affected by the loss of the Orbital-3 launch vehicle and mission in October 2014.

The following content was provided by Yugo Kimoto, and is maintained in a database by the ISS Program Science Office.
Information provided courtesy of the Japan Aerospace and Exploration Agency (JAXA).
Experiment Details

OpNom: Degradation Monitor Sample

Principal Investigator(s)
Yugo Kimoto, Japan Aerospace Exploration Agency, Tsukuba, Japan

Co-Investigator(s)/Collaborator(s)
Information Pending

Developer(s)
Information Pending

Sponsoring Space Agency
Japan Aerospace Exploration Agency (JAXA)

Sponsoring Organization
Japan Aerospace Exploration Agency

Research Benefits
Earth Benefits, Space Exploration

ISS Expedition Duration
September 2014 - March 2015; September 2015 - March 2016

Expeditions Assigned
41/42,45/46

Previous Missions
JEM/MPAC&SEED, MPAC&SEED on SM, MISSE series, Material Exposure and Degradation Experiment (MEDET)

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Experiment Description

Research Overview
The effects of the space environment on materials are very severe and complex, as they depend upon the orbit in which the spacecraft is placed. In particular, in the orbit in which the International Space Station (ISS) is operated, interaction with both high-energy particles in space and the dominant neutral gas, atomic oxygen (AO), especially, causes performance problems. In a spacecraft materials exposure experiment, the materials are exposed in space, and returned to Earth for analysis. The experiment samples provide researchers with a better understanding of the actual space environment effects on these materials.

Description
Information Pending

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Applications

Space Applications
Satellites in low-Earth orbit are exposed to extreme variations in temperature and are bombarded by high-energy particles, including particles from the sun and from neutral gases like single-atom oxygen. Atomic oxygen is especially corrosive to certain materials, weakening a spacecraft’s exterior and potentially damaging its instruments. This investigation studies a new type of thermal control material that can be used on future satellites in low-Earth orbit, analyzing how much it degrades in the presence of atomic oxygen.

Earth Applications
Satellites orbiting at low altitudes are important for a wide range of uses, from telecommunications to weather and climate information. Studying materials that can withstand the harmful environment of low-Earth orbit leads to stronger, more robust spacecraft that can last longer, benefiting people on Earth.

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Operations

Operational Requirements and Protocols
Information Pending

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Decadal Survey Recommendations

Information Pending

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Results/More Information

Information Pending

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Related Websites

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Imagery

image NASA Image: ISS045E084249 - JAXA astronaut Kimiya Yui poses with the ExHAM-MDM2 hardware aboard the ISS.
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NASA Image: ISS045E084247 - ExHAM-MDM2 hardware aboard the ISS.

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NASA Image: ISS045E083527 - Documentation of the Solar Sail Type A sample attached to the J and K positions on the Handhold Experiment Platform (HXP) for ExHAM-MDM2 experiment operations.

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NASA Image: ISS045E083533 - Documentation of the Solar Sail Type B sample attached to the N and P positions on the Handhold Experiment Platform (HXP) for ExHAM-MDM2 experiment operations.

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