Abstract
The Japanese Experiment Module (JEM), a part of the International Space Station is designed to protect its manned pressurized structure from impacts of Micrometeoroid-Orbital Debris (MM-OD) up to 1 cm in diameter. Though the probability of impacts of MM-OD with a diameter of 1 cm to 10 cm is very low, the occurrence of such large MM-OD impact will damage the JEM pressurized structure. When the damage to pressurized structures is large enough, a catastrophic failure may occur. To assess the probability of unstable structural failure caused by the MM-OD impact, we evaleated the JEM fracture mechanics parameters related to critical crack length. This report summarizes the results of JEM pressurized structure safety evaluation from the fracture mechanics aspects when MM-OD strikes.
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